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Google OR-Tools v9.9
a fast and portable software suite for combinatorial optimization
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Google OR-Tools v9.9
a fast and portable software suite for combinatorial optimization
|
Classes | |
| enum | BinaryMinizationAlgorithm |
| class | Builder |
| enum | ClauseOrdering |
| enum | ClauseProtection |
| enum | ConflictMinimizationAlgorithm |
| enum | FPRoundingMethod |
| enum | MaxSatAssumptionOrder |
| enum | MaxSatStratificationAlgorithm |
| enum | Polarity |
| enum | RestartAlgorithm |
| enum | SearchBranching |
| enum | SharedTreeSplitStrategy |
| enum | VariableOrder |
Static Public Member Functions | |
| static final com.google.protobuf.Descriptors.Descriptor | getDescriptor () |
| static com.google.ortools.sat.SatParameters | parseFrom (java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (com.google.protobuf.ByteString data) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (byte[] data) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException |
| static com.google.ortools.sat.SatParameters | parseFrom (java.io.InputStream input) throws java.io.IOException |
| static com.google.ortools.sat.SatParameters | parseFrom (java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException |
| static com.google.ortools.sat.SatParameters | parseDelimitedFrom (java.io.InputStream input) throws java.io.IOException |
| static com.google.ortools.sat.SatParameters | parseDelimitedFrom (java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException |
| static com.google.ortools.sat.SatParameters | parseFrom (com.google.protobuf.CodedInputStream input) throws java.io.IOException |
| static com.google.ortools.sat.SatParameters | parseFrom (com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException |
| static Builder | newBuilder () |
| static Builder | newBuilder (com.google.ortools.sat.SatParameters prototype) |
| static com.google.ortools.sat.SatParameters | getDefaultInstance () |
| static com.google.protobuf.Parser< SatParameters > | parser () |
Protected Member Functions | |
| java.lang.Object | newInstance (UnusedPrivateParameter unused) |
| com.google.protobuf.GeneratedMessageV3.FieldAccessorTable | internalGetFieldAccessorTable () |
| Builder | newBuilderForType (com.google.protobuf.GeneratedMessageV3.BuilderParent parent) |
Contains the definitions for all the sat algorithm parameters and their default values. NEXT TAG: 280
Protobuf type operations_research.sat.SatParameters
Definition at line 17 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.equals | ( | final java.lang.Object | obj | ) |
Definition at line 11076 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getAbsoluteGapLimit | ( | ) |
Stop the search when the gap between the best feasible objective (O) and our best objective bound (B) is smaller than a limit. The exact definition is: - Absolute: abs(O - B) - Relative: abs(O - B) / max(1, abs(O)). Important: The relative gap depends on the objective offset! If you artificially shift the objective, you will get widely different value of the relative gap. Note that if the gap is reached, the search status will be OPTIMAL. But one can check the best objective bound to see the actual gap. If the objective is integer, then any absolute gap < 1 will lead to a true optimal. If the objective is floating point, a gap of zero make little sense so is is why we use a non-zero default value. At the end of the search, we will display a warning if OPTIMAL is reported yet the gap is greater than this absolute gap.
optional double absolute_gap_limit = 159 [default = 0.0001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3304 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddCgCuts | ( | ) |
Whether we generate and add Chvatal-Gomory cuts to the LP at root node. Note that for now, this is not heavily tuned.
optional bool add_cg_cuts = 117 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8253 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddCliqueCuts | ( | ) |
Whether we generate clique cuts from the binary implication graph. Note that as the search goes on, this graph will contains new binary clauses learned by the SAT engine.
optional bool add_clique_cuts = 172 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8342 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddLinMaxCuts | ( | ) |
For the lin max constraints, generates the cuts described in "Strong mixed-integer programming formulations for trained neural networks" by Ross Anderson et. (https://arxiv.org/pdf/1811.01988.pdf)
optional bool add_lin_max_cuts = 152 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8433 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddLpConstraintsLazily | ( | ) |
If true, we start by an empty LP, and only add constraints not satisfied by the current LP solution batch by batch. A constraint that is only added like this is known as a "lazy" constraint in the literature, except that we currently consider all constraints as lazy here.
optional bool add_lp_constraints_lazily = 112 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8507 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddMirCuts | ( | ) |
Whether we generate MIR cuts at root node. Note that for now, this is not heavily tuned.
optional bool add_mir_cuts = 120 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8282 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddObjectiveCut | ( | ) |
When the LP objective is fractional, do we add the cut that forces the linear objective expression to be greater or equal to this fractional value rounded up? We can always do that since our objective is integer, and combined with MIR heuristic to reduce the coefficient of such cut, it can help.
optional bool add_objective_cut = 197 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8224 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddRltCuts | ( | ) |
Whether we generate RLT cuts. This is still experimental but can help on binary problem with a lot of clauses of size 3.
optional bool add_rlt_cuts = 279 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8371 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAddZeroHalfCuts | ( | ) |
Whether we generate Zero-Half cuts at root node. Note that for now, this is not heavily tuned.
optional bool add_zero_half_cuts = 169 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8311 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAlsoBumpVariablesInConflictReasons | ( | ) |
When this is true, then the variables that appear in any of the reason of the variables in a conflict have their activity bumped. This is addition to the variables in the conflict, and the one that were used during conflict resolution.
optional bool also_bump_variables_in_conflict_reasons = 77 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2304 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getAtMostOneMaxExpansionSize | ( | ) |
All at_most_one constraints with a size <= param will be replaced by a quadratic number of binary implications.
optional int32 at_most_one_max_expansion_size = 270 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7728 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getAutoDetectGreaterThanAtLeastOneOf | ( | ) |
If true, then the precedences propagator try to detect for each variable if it has a set of "optional incoming arc" for which at least one of them is present. This is usually useful to have but can be slow on model with a lot of precedence.
optional bool auto_detect_greater_than_at_least_one_of = 95 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7248 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.BinaryMinizationAlgorithm com.google.ortools.sat.SatParameters.getBinaryMinimizationAlgorithm | ( | ) |
optional .operations_research.sat.SatParameters.BinaryMinizationAlgorithm binary_minimization_algorithm = 34 [default = BINARY_MINIMIZATION_FIRST];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2339 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getBinarySearchNumConflicts | ( | ) |
If non-negative, perform a binary search on the objective variable in order to find an [min, max] interval outside of which the solver proved unsat/sat under this amount of conflict. This can quickly reduce the objective domain on some problems.
optional int32 binary_search_num_conflicts = 99 [default = -1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6489 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getBlockingRestartMultiplier | ( | ) |
optional double blocking_restart_multiplier = 66 [default = 1.4];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3047 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getBlockingRestartWindowSize | ( | ) |
optional int32 blocking_restart_window_size = 65 [default = 5000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3028 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getBooleanEncodingLevel | ( | ) |
A non-negative level indicating how much we should try to fully encode Integer variables as Boolean.
optional int32 boolean_encoding_level = 107 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8061 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getCatchSigintSignal | ( | ) |
Indicates if the CP-SAT layer should catch Control-C (SIGINT) signals when calling solve. If set, catching the SIGINT signal will terminate the search gracefully, as if a time limit was reached.
optional bool catch_sigint_signal = 135 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7759 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getClauseActivityDecay | ( | ) |
Clause activity parameters (same effect as the one on the variables).
optional double clause_activity_decay = 17 [default = 0.999];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2731 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getClauseCleanupLbdBound | ( | ) |
All the clauses with a LBD (literal blocks distance) lower or equal to this parameters will always be kept.
optional int32 clause_cleanup_lbd_bound = 59 [default = 5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2507 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.ClauseOrdering com.google.ortools.sat.SatParameters.getClauseCleanupOrdering | ( | ) |
optional .operations_research.sat.SatParameters.ClauseOrdering clause_cleanup_ordering = 60 [default = CLAUSE_ACTIVITY];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2524 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getClauseCleanupPeriod | ( | ) |
Trigger a cleanup when this number of "deletable" clauses is learned.
optional int32 clause_cleanup_period = 11 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2400 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.ClauseProtection com.google.ortools.sat.SatParameters.getClauseCleanupProtection | ( | ) |
optional .operations_research.sat.SatParameters.ClauseProtection clause_cleanup_protection = 58 [default = PROTECTION_NONE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2477 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getClauseCleanupRatio | ( | ) |
During a cleanup, if clause_cleanup_target is 0, we will delete the clause_cleanup_ratio of "deletable" clauses instead of aiming for a fixed target of clauses to keep.
optional double clause_cleanup_ratio = 190 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2460 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getClauseCleanupTarget | ( | ) |
During a cleanup, we will always keep that number of "deletable" clauses. Note that this doesn't include the "protected" clauses.
optional int32 clause_cleanup_target = 13 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2429 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getConvertIntervals | ( | ) |
Temporary flag util the feature is more mature. This convert intervals to the newer proto format that support affine start/var/end instead of just variables.
optional bool convert_intervals = 177 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7908 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getCoreMinimizationLevel | ( | ) |
If positive, we spend some effort on each core: - At level 1, we use a simple heuristic to try to minimize an UNSAT core. - At level 2, we use propagation to minimize the core but also identify literal in at most one relationship in this core.
optional int32 core_minimization_level = 50 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5353 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getCountAssumptionLevelsInLbd | ( | ) |
Whether or not the assumption levels are taken into account during the LBD computation. According to the reference below, not counting them improves the solver in some situation. Note that this only impact solves under assumptions. Gilles Audemard, Jean-Marie Lagniez, Laurent Simon, "Improving Glucose for Incremental SAT Solving with Assumptions: Application to MUS Extraction" Theory and Applications of Satisfiability Testing - SAT 2013, Lecture Notes in Computer Science Volume 7962, 2013, pp 309-317.
optional bool count_assumption_levels_in_lbd = 49 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3721 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getCoverOptimization | ( | ) |
If true, when the max-sat algo find a core, we compute the minimal number of literals in the core that needs to be true to have a feasible solution. This is also called core exhaustion in more recent max-SAT papers.
optional bool cover_optimization = 89 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5413 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getCpModelPresolve | ( | ) |
Whether we presolve the cp_model before solving it.
optional bool cp_model_presolve = 86 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3982 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getCpModelProbingLevel | ( | ) |
How much effort do we spend on probing. 0 disables it completely.
optional int32 cp_model_probing_level = 110 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4009 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getCpModelUseSatPresolve | ( | ) |
Whether we also use the sat presolve when cp_model_presolve is true.
optional bool cp_model_use_sat_presolve = 93 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4036 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getCutActiveCountDecay | ( | ) |
optional double cut_active_count_decay = 156 [default = 0.8];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8683 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getCutCleanupTarget | ( | ) |
Target number of constraints to remove during cleanup.
optional int32 cut_cleanup_target = 157 [default = 1000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8710 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getCutLevel | ( | ) |
Control the global cut effort. Zero will turn off all cut. For now we just have one level. Note also that most cuts are only used at linearization level >= 2.
optional int32 cut_level = 196 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8160 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getCutMaxActiveCountValue | ( | ) |
These parameters are similar to sat clause management activity parameters. They are effective only if the number of generated cuts exceed the storage limit. Default values are based on a few experiments on miplib instances.
optional double cut_max_active_count_value = 155 [default = 10000000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8664 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDebugCrashOnBadHint | ( | ) |
Crash if we do not manage to complete the hint into a full solution.
optional bool debug_crash_on_bad_hint = 195 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5287 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getDebugMaxNumPresolveOperations | ( | ) |
If positive, try to stop just after that many presolve rules have been applied. This is mainly useful for debugging presolve.
optional int32 debug_max_num_presolve_operations = 151 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5260 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDebugPostsolveWithFullSolver | ( | ) |
We have two different postsolve code. The default one should be better and it allows for a more powerful presolve, but it can be useful to postsolve using the full solver instead.
optional bool debug_postsolve_with_full_solver = 162 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5231 of file SatParameters.java.
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static |
Definition at line 32655 of file SatParameters.java.
| com.google.ortools.sat.SatParameters com.google.ortools.sat.SatParameters.getDefaultInstanceForType | ( | ) |
Definition at line 32691 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getDefaultRestartAlgorithms | ( | ) |
optional string default_restart_algorithms = 70 [default = "LUBY_RESTART,LBD_MOVING_AVERAGE_RESTART,DL_MOVING_AVERAGE_RESTART"];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2845 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getDefaultRestartAlgorithmsBytes | ( | ) |
optional string default_restart_algorithms = 70 [default = "LUBY_RESTART,LBD_MOVING_AVERAGE_RESTART,DL_MOVING_AVERAGE_RESTART"];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2865 of file SatParameters.java.
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static |
Definition at line 194 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDetectLinearizedProduct | ( | ) |
Infer products of Boolean or of Boolean time IntegerVariable from the linear constrainst in the problem. This can be used in some cuts, altough for now we don't really exploit it.
optional bool detect_linearized_product = 277 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8921 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDetectTableWithCost | ( | ) |
If true, we detect variable that are unique to a table constraint and only there to encode a cost on each tuple. This is usually the case when a WCSP (weighted constraint program) is encoded into CP-SAT format. This can lead to a dramatic speed-up for such problems but is still experimental at this point.
optional bool detect_table_with_cost = 216 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4073 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDisableConstraintExpansion | ( | ) |
If true, it disable all constraint expansion. This should only be used to test the presolve of expanded constraints.
optional bool disable_constraint_expansion = 181 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4193 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getDiversifyLnsParams | ( | ) |
If true, registers more lns subsolvers with different parameters.
optional bool diversify_lns_params = 137 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7511 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getEncodeComplexLinearConstraintWithInteger | ( | ) |
Linear constraint with a complex right hand side (more than a single interval) need to be expanded, there is a couple of way to do that.
optional bool encode_complex_linear_constraint_with_integer = 223 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4222 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getEnumerateAllSolutions | ( | ) |
Whether we enumerate all solutions of a problem without objective. Note that setting this to true automatically disable some presolve reduction that can remove feasible solution. That is it has the same effect as setting keep_all_feasible_solutions_in_presolve. TODO(user): Do not do that and let the user choose what behavior is best by setting keep_all_feasible_solutions_in_presolve ?
optional bool enumerate_all_solutions = 87 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7061 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExpandAlldiffConstraints | ( | ) |
If true, expand all_different constraints that are not permutations. Permutations (#Variables = #Values) are always expanded.
optional bool expand_alldiff_constraints = 170 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4135 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExpandReservoirConstraints | ( | ) |
If true, expand the reservoir constraints by creating booleans for all possible precedences between event and encoding the constraint.
optional bool expand_reservoir_constraints = 182 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4164 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitAllLpSolution | ( | ) |
If true and the Lp relaxation of the problem has a solution, try to exploit it. This is same as above except in this case the lp solution might not be an integer solution.
optional bool exploit_all_lp_solution = 116 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8803 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitAllPrecedences | ( | ) |
optional bool exploit_all_precedences = 220 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5845 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitBestSolution | ( | ) |
When branching on a variable, follow the last best solution value.
optional bool exploit_best_solution = 130 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8830 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitIntegerLpSolution | ( | ) |
If true and the Lp relaxation of the problem has an integer optimal solution, try to exploit it. Note that since the LP relaxation may not contain all the constraints, such a solution is not necessarily a solution of the full problem.
optional bool exploit_integer_lp_solution = 94 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8772 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitObjective | ( | ) |
When branching an a variable that directly affect the objective, branch on the value that lead to the best objective first.
optional bool exploit_objective = 131 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8890 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getExploitRelaxationSolution | ( | ) |
When branching on a variable, follow the last best relaxation solution value. We use the relaxation with the tightest bound on the objective as the best relaxation solution.
optional bool exploit_relaxation_solution = 161 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8861 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getExtraSubsolvers | ( | int | index | ) |
A convenient way to add more workers types. These will be added at the beginning of the list.
repeated string extra_subsolvers = 219;
| index | The index of the element to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4911 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getExtraSubsolversBytes | ( | int | index | ) |
A convenient way to add more workers types. These will be added at the beginning of the list.
repeated string extra_subsolvers = 219;
| index | The index of the value to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4925 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getExtraSubsolversCount | ( | ) |
A convenient way to add more workers types. These will be added at the beginning of the list.
repeated string extra_subsolvers = 219;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4898 of file SatParameters.java.
| com.google.protobuf.ProtocolStringList com.google.ortools.sat.SatParameters.getExtraSubsolversList | ( | ) |
A convenient way to add more workers types. These will be added at the beginning of the list.
repeated string extra_subsolvers = 219;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4886 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getFeasibilityJumpDecay | ( | ) |
On each restart, we randomly choose if we use decay (with this parameter) or no decay.
optional double feasibility_jump_decay = 242 [default = 0.95];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6615 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFeasibilityJumpEnableRestarts | ( | ) |
When stagnating, feasibility jump will either restart from a default solution (with some possible randomization), or randomly pertubate the current solution. This parameter selects the first option.
optional bool feasibility_jump_enable_restarts = 250 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6762 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getFeasibilityJumpLinearizationLevel | ( | ) |
How much do we linearize the problem in the local search code.
optional int32 feasibility_jump_linearization_level = 257 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6642 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getFeasibilityJumpMaxExpandedConstraintSize | ( | ) |
Maximum size of no_overlap or no_overlap_2d constraint for a quadratic expansion.
optional int32 feasibility_jump_max_expanded_constraint_size = 264 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6791 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getFeasibilityJumpRestartFactor | ( | ) |
This is a factor that directly influence the work before each restart. Setting this to zero disable restart, and increasing it lead to longer restarts.
optional int32 feasibility_jump_restart_factor = 258 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6673 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getFeasibilityJumpVarPerburbationRangeRatio | ( | ) |
Max distance between the default value and the pertubated value relative to the range of the domain of the variable.
optional double feasibility_jump_var_perburbation_range_ratio = 248 [default = 0.2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6731 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getFeasibilityJumpVarRandomizationProbability | ( | ) |
Probability for a variable to have a non default value upon restarts or perturbations.
optional double feasibility_jump_var_randomization_probability = 247 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6702 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFillAdditionalSolutionsInResponse | ( | ) |
If true, the final response addition_solutions field will be filled with all solutions from our solutions pool. Note that if both this field and enumerate_all_solutions is true, we will copy to the pool all of the solution found. So if solution_pool_size is big enough, you can get all solutions this way instead of using the solution callback. Note that this only affect the "final" solution, not the one passed to the solution callbacks.
optional bool fill_additional_solutions_in_response = 194 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7182 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFillTightenedDomainsInResponse | ( | ) |
If true, add information about the derived variable domains to the CpSolverResponse. It is an option because it makes the response slighly bigger and there is a bit more work involved during the postsolve to construct it, but it should still have a low overhead. See the tightened_variables field in CpSolverResponse for more details.
optional bool fill_tightened_domains_in_response = 132 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7137 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFindBigLinearOverlap | ( | ) |
Try to find large "rectangle" in the linear constraint matrix with identical lines. If such rectangle is big enough, we can introduce a new integer variable corresponding to the common expression and greatly reduce the number of non-zero.
optional bool find_big_linear_overlap = 234 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4480 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFindMultipleCores | ( | ) |
Whether we try to find more independent cores for a given set of assumptions in the core based max-SAT algorithms.
optional bool find_multiple_cores = 84 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5382 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getFixVariablesToTheirHintedValue | ( | ) |
If true, variables appearing in the solution hints will be fixed to their hinted value.
optional bool fix_variables_to_their_hinted_value = 192 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6156 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.FPRoundingMethod com.google.ortools.sat.SatParameters.getFpRounding | ( | ) |
optional .operations_research.sat.SatParameters.FPRoundingMethod fp_rounding = 165 [default = PROPAGATION_ASSISTED];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7483 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getGlucoseDecayIncrement | ( | ) |
optional double glucose_decay_increment = 23 [default = 0.01];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2685 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getGlucoseDecayIncrementPeriod | ( | ) |
optional int32 glucose_decay_increment_period = 24 [default = 5000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2704 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getGlucoseMaxDecay | ( | ) |
The activity starts at 0.8 and increment by 0.01 every 5000 conflicts until 0.95. This "hack" seems to work well and comes from: Glucose 2.3 in the SAT 2013 Competition - SAT Competition 2013 http://edacc4.informatik.uni-ulm.de/SC13/solver-description-download/136
optional double glucose_max_decay = 22 [default = 0.95];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2666 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getHintConflictLimit | ( | ) |
Conflict limit used in the phase that exploit the solution hint.
optional int32 hint_conflict_limit = 153 [default = 10];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6094 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getIgnoreNames | ( | ) |
If true, we don't keep names in our internal copy of the user given model.
optional bool ignore_names = 202 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4412 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getIgnoreSubsolvers | ( | int | index | ) |
Rather than fully specifying subsolvers, it is often convenient to just remove the ones that are not useful on a given problem.
repeated string ignore_subsolvers = 209;
| index | The index of the element to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4968 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getIgnoreSubsolversBytes | ( | int | index | ) |
Rather than fully specifying subsolvers, it is often convenient to just remove the ones that are not useful on a given problem.
repeated string ignore_subsolvers = 209;
| index | The index of the value to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4982 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getIgnoreSubsolversCount | ( | ) |
Rather than fully specifying subsolvers, it is often convenient to just remove the ones that are not useful on a given problem.
repeated string ignore_subsolvers = 209;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4955 of file SatParameters.java.
| com.google.protobuf.ProtocolStringList com.google.ortools.sat.SatParameters.getIgnoreSubsolversList | ( | ) |
Rather than fully specifying subsolvers, it is often convenient to just remove the ones that are not useful on a given problem.
repeated string ignore_subsolvers = 209;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4943 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getInferAllDiffs | ( | ) |
Run a max-clique code amongst all the x != y we can find and try to infer set of variables that are all different. This allows to close neos16.mps for instance. Note that we only run this code if there is no all_diff already in the model so that if a user want to add some all_diff, we assume it is well done and do not try to add more.
optional bool infer_all_diffs = 233 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4447 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.Polarity com.google.ortools.sat.SatParameters.getInitialPolarity | ( | ) |
optional .operations_research.sat.SatParameters.Polarity initial_polarity = 2 [default = POLARITY_FALSE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2058 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getInitialVariablesActivity | ( | ) |
The initial value of the variables activity. A non-zero value only make sense when use_erwa_heuristic is true. Experiments with a value of 1e-2 together with the ERWA heuristic showed slighthly better result than simply using zero. The idea is that when the "learning rate" of a variable becomes lower than this value, then we prefer to branch on never explored before variables. This is not in the ERWA paper.
optional double initial_variables_activity = 76 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2271 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getInprocessingDtimeRatio | ( | ) |
Proportion of deterministic time we should spend on inprocessing. At each "restart", if the proportion is below this ratio, we will do some inprocessing, otherwise, we skip it for this restart.
optional double inprocessing_dtime_ratio = 273 [default = 0.2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4540 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getInprocessingMinimizationDtime | ( | ) |
Parameters for an heuristic similar to the one described in "An effective learnt clause minimization approach for CDCL Sat Solvers", https://www.ijcai.org/proceedings/2017/0098.pdf This is the amount of dtime we should spend on this technique during each inprocessing phase. The minimization technique is the same as the one used to minimize core in max-sat. We also minimize problem clauses and not just the learned clause that we keep forever like in the paper.
optional double inprocessing_minimization_dtime = 275 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4612 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getInprocessingProbingDtime | ( | ) |
The amount of dtime we should spend on probing for each inprocessing round.
optional double inprocessing_probing_dtime = 274 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4567 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getInstantiateAllVariables | ( | ) |
If true, the solver will add a default integer branching strategy to the already defined search strategy. If not, some variable might still not be fixed at the end of the search. For now we assume these variable can just be set to their lower bound.
optional bool instantiate_all_variables = 106 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7215 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getInterleaveBatchSize | ( | ) |
optional int32 interleave_batch_size = 134 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5119 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getInterleaveSearch | ( | ) |
Experimental. If this is true, then we interleave all our major search strategy and distribute the work amongst num_workers. The search is deterministic (independently of num_workers!), and we schedule and wait for interleave_batch_size task to be completed before synchronizing and scheduling the next batch of tasks.
optional bool interleave_search = 136 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5100 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getKeepAllFeasibleSolutionsInPresolve | ( | ) |
If true, we disable the presolve reductions that remove feasible solutions from the search space. Such solution are usually dominated by a "better" solution that is kept, but depending on the situation, we might want to keep all solutions. A trivial example is when a variable is unused. If this is true, then the presolve will not fix it to an arbitrary value and it will stay in the search space.
optional bool keep_all_feasible_solutions_in_presolve = 173 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7102 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getLinearizationLevel | ( | ) |
A non-negative level indicating the type of constraints we consider in the LP relaxation. At level zero, no LP relaxation is used. At level 1, only the linear constraint and full encoding are added. At level 2, we also add all the Boolean constraints.
optional int32 linearization_level = 90 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8032 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getLinearSplitSize | ( | ) |
Linear constraints that are not pseudo-Boolean and that are longer than this size will be split into sqrt(size) intermediate sums in order to have faster propation in the CP engine.
optional int32 linear_split_size = 256 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7999 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getLogPrefix | ( | ) |
Add a prefix to all logs.
optional string log_prefix = 185 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3525 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getLogPrefixBytes | ( | ) |
Add a prefix to all logs.
optional string log_prefix = 185 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3549 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getLogSearchProgress | ( | ) |
Whether the solver should log the search progress. This is the maing logging parameter and if this is false, none of the logging (callbacks, log_to_stdout, log_to_response, ...) will do anything.
optional bool log_search_progress = 41 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3464 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getLogSubsolverStatistics | ( | ) |
Whether the solver should display per sub-solver search statistics. This is only useful is log_search_progress is set to true, and if the number of search workers is > 1. Note that in all case we display a bit of stats with one line per subsolver.
optional bool log_subsolver_statistics = 189 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3497 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getLogToResponse | ( | ) |
Log to response proto.
optional bool log_to_response = 187 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3612 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getLogToStdout | ( | ) |
Log to stdout.
optional bool log_to_stdout = 186 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3585 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getLpDualTolerance | ( | ) |
optional double lp_dual_tolerance = 267 [default = 1e-07];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7877 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getLpPrimalTolerance | ( | ) |
The internal LP tolerances used by CP-SAT. These applies to the internal and scaled problem. If the domains of your variables are large it might be good to use lower tolerances. If your problem is binary with low coefficients, it might be good to use higher ones to speed-up the lp solves.
optional double lp_primal_tolerance = 266 [default = 1e-07];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7858 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxAllDiffCutSize | ( | ) |
Cut generator for all diffs can add too many cuts for large all_diff constraints. This parameter restricts the large all_diff constraints to have a cut generator.
optional int32 max_all_diff_cut_size = 148 [default = 64];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8402 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMaxClauseActivityValue | ( | ) |
optional double max_clause_activity_value = 18 [default = 1e+20];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2750 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxConsecutiveInactiveCount | ( | ) |
If a constraint/cut in LP is not active for that many consecutive OPTIMAL solves, remove it from the LP. Note that it might be added again later if it become violated by the current LP solution.
optional int32 max_consecutive_inactive_count = 121 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8633 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxCutRoundsAtLevelZero | ( | ) |
Max number of time we perform cut generation and resolve the LP at level 0.
optional int32 max_cut_rounds_at_level_zero = 154 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8602 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMaxDeterministicTime | ( | ) |
Maximum time allowed in deterministic time to solve a problem. The deterministic time should be correlated with the real time used by the solver, the time unit being as close as possible to a second.
optional double max_deterministic_time = 67 [default = inf];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3167 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxDomainSizeWhenEncodingEqNeqConstraints | ( | ) |
When loading a*x + b*y ==/!= c when x and y are both fully encoded. The solver may decide to replace the linear equation by a set of clauses. This is triggered if the sizes of the domains of x and y are below the threshold.
optional int32 max_domain_size_when_encoding_eq_neq_constraints = 191 [default = 16];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8094 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxIntegerRoundingScaling | ( | ) |
In the integer rounding procedure used for MIR and Gomory cut, the maximum "scaling" we use (must be positive). The lower this is, the lower the integer coefficients of the cut will be. Note that cut generated by lower values are not necessarily worse than cut generated by larger value. There is no strict dominance relationship. Setting this to 2 result in the "strong fractional rouding" of Letchford and Lodi.
optional int32 max_integer_rounding_scaling = 119 [default = 600];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8474 of file SatParameters.java.
| long com.google.ortools.sat.SatParameters.getMaxMemoryInMb | ( | ) |
Maximum memory allowed for the whole thread containing the solver. The solver will abort as soon as it detects that this limit is crossed. As a result, this limit is approximative, but usually the solver will not go too much over. TODO(user): This is only used by the pure SAT solver, generalize to CP-SAT.
optional int64 max_memory_in_mb = 40 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3243 of file SatParameters.java.
| long com.google.ortools.sat.SatParameters.getMaxNumberOfConflicts | ( | ) |
Maximum number of conflicts allowed to solve a problem. TODO(user): Maybe change the way the conflict limit is enforced? currently it is enforced on each independent internal SAT solve, rather than on the overall number of conflicts across all solves. So in the context of an optimization problem, this is not really usable directly by a client.
optional int64 max_number_of_conflicts = 37 [default = 9223372036854775807];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3206 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxNumCuts | ( | ) |
The limit on the number of cuts in our cut pool. When this is reached we do not generate cuts anymore. TODO(user): We should probably remove this parameters, and just always generate cuts but only keep the best n or something.
optional int32 max_num_cuts = 91 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8129 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxNumIntervalsForTimetableEdgeFinding | ( | ) |
Max number of intervals for the timetable_edge_finding algorithm to propagate. A value of 0 disables the constraint.
optional int32 max_num_intervals_for_timetable_edge_finding = 260 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5789 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxPairsPairwiseReasoningInNoOverlap2D | ( | ) |
If the number of pairs to look is below this threshold, do an extra step of propagation in the no_overlap_2d constraint by looking at all pairs of intervals.
optional int32 max_pairs_pairwise_reasoning_in_no_overlap_2d = 276 [default = 1250];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6018 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxPresolveIterations | ( | ) |
In case of large reduction in a presolve iteration, we perform multiple presolve iterations. This parameter controls the maximum number of such presolve iterations.
optional int32 max_presolve_iterations = 138 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3955 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.MaxSatAssumptionOrder com.google.ortools.sat.SatParameters.getMaxSatAssumptionOrder | ( | ) |
optional .operations_research.sat.SatParameters.MaxSatAssumptionOrder max_sat_assumption_order = 51 [default = DEFAULT_ASSUMPTION_ORDER];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5430 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMaxSatReverseAssumptionOrder | ( | ) |
If true, adds the assumption in the reverse order of the one defined by max_sat_assumption_order.
optional bool max_sat_reverse_assumption_order = 52 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5460 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.MaxSatStratificationAlgorithm com.google.ortools.sat.SatParameters.getMaxSatStratification | ( | ) |
optional .operations_research.sat.SatParameters.MaxSatStratificationAlgorithm max_sat_stratification = 53 [default = STRATIFICATION_DESCENT];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5477 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMaxSizeToCreatePrecedenceLiteralsInDisjunctive | ( | ) |
Create one literal for each disjunction of two pairs of tasks. This slows down the solve time, but improves the lower bound of the objective in the makespan case. This will be triggered if the number of intervals is less or equal than the parameter and if use_strong_propagation_in_disjunctive is true.
optional int32 max_size_to_create_precedence_literals_in_disjunctive = 229 [default = 60];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5599 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMaxTimeInSeconds | ( | ) |
Maximum time allowed in seconds to solve a problem. The counter will starts at the beginning of the Solve() call.
optional double max_time_in_seconds = 36 [default = inf];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3136 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMaxVariableActivityValue | ( | ) |
optional double max_variable_activity_value = 16 [default = 1e+100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2631 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMergeAtMostOneWorkLimit | ( | ) |
optional double merge_at_most_one_work_limit = 146 [default = 100000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4276 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMergeNoOverlapWorkLimit | ( | ) |
During presolve, we use a maximum clique heuristic to merge together no-overlap constraints or at most one constraints. This code can be slow, so we have a limit in place on the number of explored nodes in the underlying graph. The internal limit is an int64, but we use double here to simplify manual input.
optional double merge_no_overlap_work_limit = 145 [default = 1000000000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4257 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.ConflictMinimizationAlgorithm com.google.ortools.sat.SatParameters.getMinimizationAlgorithm | ( | ) |
optional .operations_research.sat.SatParameters.ConflictMinimizationAlgorithm minimization_algorithm = 4 [default = RECURSIVE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2321 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMinimizeReductionDuringPbResolution | ( | ) |
A different algorithm during PB resolution. It minimizes the number of calls to ReduceCoefficients() which can be time consuming. However, the search space will be different and if the coefficients are large, this may lead to integer overflows that could otherwise be prevented.
optional bool minimize_reduction_during_pb_resolution = 48 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3678 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMinNumLnsWorkers | ( | ) |
Obsolete parameter. No-op.
optional int32 min_num_lns_workers = 211 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4711 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMinOrthogonalityForLpConstraints | ( | ) |
While adding constraints, skip the constraints which have orthogonality less than 'min_orthogonality_for_lp_constraints' with already added constraints during current call. Orthogonality is defined as 1 - cosine(vector angle between constraints). A value of zero disable this feature.
optional double min_orthogonality_for_lp_constraints = 115 [default = 0.05];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8575 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMipAutomaticallyScaleVariables | ( | ) |
If true, some continuous variable might be automatically scaled. For now, this is only the case where we detect that a variable is actually an integer multiple of a constant. For instance, variables of the form k * 0.5 are quite frequent, and if we detect this, we will scale such variable domain by 2 to make it implied integer.
optional bool mip_automatically_scale_variables = 166 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9049 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipCheckPrecision | ( | ) |
As explained in mip_precision and mip_max_activity_exponent, we cannot always reach the wanted precision during scaling. We use this threshold to enphasize in the logs when the precision seems bad.
optional double mip_check_precision = 128 [default = 0.0001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9229 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMipComputeTrueObjectiveBound | ( | ) |
Even if we make big error when scaling the objective, we can always derive a correct lower bound on the original objective by using the exact lower bound on the scaled integer version of the objective. This should be fast, but if you don't care about having a precise lower bound, you can turn it off.
optional bool mip_compute_true_objective_bound = 198 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9264 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipDropTolerance | ( | ) |
Any value in the input mip with a magnitude lower than this will be set to zero. This is to avoid some issue in LP presolving.
optional double mip_drop_tolerance = 232 [default = 1e-16];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9365 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMipMaxActivityExponent | ( | ) |
To avoid integer overflow, we always force the maximum possible constraint activity (and objective value) according to the initial variable domain to be smaller than 2 to this given power. Because of this, we cannot always reach the "mip_wanted_precision" parameter above. This can go as high as 62, but some internal algo currently abort early if they might run into integer overflow, so it is better to keep it a bit lower than this.
optional int32 mip_max_activity_exponent = 127 [default = 53];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9198 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipMaxBound | ( | ) |
We need to bound the maximum magnitude of the variables for CP-SAT, and that is the bound we use. If the MIP model expect larger variable value in the solution, then the converted model will likely not be relevant.
optional double mip_max_bound = 124 [default = 10000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8952 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipMaxValidMagnitude | ( | ) |
Any finite values in the input MIP must be below this threshold, otherwise the model will be reported invalid. This is needed to avoid floating point overflow when evaluating bounds * coeff for instance. We are a bit more defensive, but in practice, users shouldn't use super large values in a MIP.
optional double mip_max_valid_magnitude = 199 [default = 1e+20];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9299 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getMipPresolveLevel | ( | ) |
When solving a MIP, we do some basic floating point presolving before scaling the problem to integer to be handled by CP-SAT. This control how much of that presolve we do. It can help to better scale floating point model, but it is not always behaving nicely.
optional int32 mip_presolve_level = 261 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9398 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMipScaleLargeDomain | ( | ) |
If this is false, then mip_var_scaling is only applied to variables with "small" domain. If it is true, we scale all floating point variable independenlty of their domain.
optional bool mip_scale_large_domain = 225 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9014 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getMipTreatHighMagnitudeBoundsAsInfinity | ( | ) |
By default, any variable/constraint bound with a finite value and a magnitude greater than the mip_max_valid_magnitude will result with a invalid model. This flags change the behavior such that such bounds are silently transformed to +∞ or -∞. It is recommended to keep it at false, and create valid bounds.
optional bool mip_treat_high_magnitude_bounds_as_infinity = 278 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9336 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipVarScaling | ( | ) |
All continuous variable of the problem will be multiplied by this factor. By default, we don't do any variable scaling and rely on the MIP model to specify continuous variable domain with the wanted precision.
optional double mip_var_scaling = 125 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8983 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getMipWantedPrecision | ( | ) |
When scaling constraint with double coefficients to integer coefficients, we will multiply by a power of 2 and round the coefficients. We will choose the lowest power such that we have no potential overflow (see mip_max_activity_exponent) and the worst case constraint activity error does not exceed this threshold. Note that we also detect constraint with rational coefficients and scale them accordingly when it seems better instead of using a power of 2. We also relax all constraint bounds by this absolute value. For pure integer constraint, if this value if lower than one, this will not change anything. However it is needed when scaling MIP problems. If we manage to scale a constraint correctly, the maximum error we can make will be twice this value (once for the scaling error and once for the relaxed bounds). If we are not able to scale that well, we will display that fact but still scale as best as we can.
optional double mip_wanted_precision = 126 [default = 1e-06];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9157 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getName | ( | ) |
In some context, like in a portfolio of search, it makes sense to name a given parameters set for logging purpose.
optional string name = 171 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 1989 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getNameBytes | ( | ) |
In some context, like in a portfolio of search, it makes sense to name a given parameters set for logging purpose.
optional string name = 171 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2014 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getNewConstraintsBatchSize | ( | ) |
Add that many lazy constraints (or cuts) at once in the LP. Note that at the beginning of the solve, we do add more than this.
optional int32 new_constraints_batch_size = 122 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8739 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getNewLinearPropagation | ( | ) |
Experimental. Use new code to propagate linear constraint.
optional bool new_linear_propagation = 224 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7968 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getNumConflictsBeforeStrategyChanges | ( | ) |
After each restart, if the number of conflict since the last strategy change is greater that this, then we increment a "strategy_counter" that can be use to change the search strategy used by the following restarts.
optional int32 num_conflicts_before_strategy_changes = 68 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3078 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getNumSearchWorkers | ( | ) |
optional int32 num_search_workers = 100 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4684 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getNumViolationLs | ( | ) |
This will create incomplete subsolvers (that are not LNS subsolvers) that use the feasibility jump code to find improving solution, treating the objective improvement as a hard constraint.
optional int32 num_violation_ls = 244 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6822 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getNumWorkers | ( | ) |
Specify the number of parallel workers (i.e. threads) to use during search. This should usually be lower than your number of available cpus + hyperthread in your machine. A value of 0 means the solver will try to use all cores on the machine. A number of 1 means no parallelism. Note that 'num_workers' is the preferred name, but if it is set to zero, we will still read the deprecated 'num_search_worker'. As of 2020-04-10, if you're using SAT via MPSolver (to solve integer programs) this field is overridden with a value of 8, if the field is not set *explicitly*. Thus, always set this field explicitly or via MPSolver::SetNumThreads().
optional int32 num_workers = 206 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4665 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getOnlyAddCutsAtLevelZero | ( | ) |
For the cut that can be generated at any level, this control if we only try to generate them at the root node.
optional bool only_add_cuts_at_level_zero = 92 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8189 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getOnlySolveIp | ( | ) |
If one try to solve a MIP model with CP-SAT, because we assume all variable to be integer after scaling, we will not necessarily have the correct optimal. Note however that all feasible solutions are valid since we will just solve a more restricted version of the original problem. This parameters is here to prevent user to think the solution is optimal when it might not be. One will need to manually set this to false to solve a MIP model where the optimal might be different. Note that this is tested after some MIP presolve steps, so even if not all original variable are integer, we might end up with a pure IP after presolve and after implied integer detection.
optional bool only_solve_ip = 222 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9098 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getOptimizeWithCore | ( | ) |
The default optimization method is a simple "linear scan", each time trying to find a better solution than the previous one. If this is true, then we use a core-based approach (like in max-SAT) when we try to increase the lower bound instead.
optional bool optimize_with_core = 83 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6421 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getOptimizeWithLbTreeSearch | ( | ) |
Do a more conventional tree search (by opposition to SAT based one) where we keep all the explored node in a tree. This is meant to be used in a portfolio and focus on improving the objective lower bound. Keeping the whole tree allow us to report a better objective lower bound coming from the worst open node in the tree.
optional bool optimize_with_lb_tree_search = 188 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6456 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getOptimizeWithMaxHs | ( | ) |
This has no effect if optimize_with_core is false. If true, use a different core-based algorithm similar to the max-HS algo for max-SAT. This is a hybrid MIP/CP approach and it uses a MIP solver in addition to the CP/SAT one. This is also related to the PhD work of tobyodavies@ "Automatic Logic-Based Benders Decomposition with MiniZinc" http://aaai.org/ocs/index.php/AAAI/AAAI17/paper/view/14489
optional bool optimize_with_max_hs = 85 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6526 of file SatParameters.java.
| com.google.protobuf.Parser< SatParameters > com.google.ortools.sat.SatParameters.getParserForType | ( | ) |
Definition at line 32686 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPbCleanupIncrement | ( | ) |
Same as for the clauses, but for the learned pseudo-Boolean constraints.
optional int32 pb_cleanup_increment = 46 [default = 200];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2552 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getPbCleanupRatio | ( | ) |
optional double pb_cleanup_ratio = 47 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2571 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPermutePresolveConstraintOrder | ( | ) |
optional bool permute_presolve_constraint_order = 179 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3414 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPermuteVariableRandomly | ( | ) |
This is mainly here to test the solver variability. Note that in tests, if not explicitly set to false, all 3 options will be set to true so that clients do not rely on the solver returning a specific solution if they are many equivalent optimal solutions.
optional bool permute_variable_randomly = 178 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3395 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPolarityRephaseIncrement | ( | ) |
If non-zero, then we change the polarity heuristic after that many number of conflicts in an arithmetically increasing fashion. So x the first time, 2 * x the second time, etc...
optional int32 polarity_rephase_increment = 168 [default = 1000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2137 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPolishLpSolution | ( | ) |
Whether we try to do a few degenerate iteration at the end of an LP solve to minimize the fractionality of the integer variable in the basis. This helps on some problems, but not so much on others. It also cost of bit of time to do such polish step.
optional bool polish_lp_solution = 175 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7823 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.VariableOrder com.google.ortools.sat.SatParameters.getPreferredVariableOrder | ( | ) |
optional .operations_research.sat.SatParameters.VariableOrder preferred_variable_order = 1 [default = IN_ORDER];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2040 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPresolveBlockedClause | ( | ) |
Whether we use an heuristic to detect some basic case of blocked clause in the SAT presolve.
optional bool presolve_blocked_clause = 88 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3864 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPresolveBvaThreshold | ( | ) |
Apply Bounded Variable Addition (BVA) if the number of clauses is reduced by stricly more than this threshold. The algorithm described in the paper uses 0, but quick experiments showed that 1 is a good value. It may not be worth it to add a new variable just to remove one clause.
optional int32 presolve_bva_threshold = 73 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3924 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPresolveBveClauseWeight | ( | ) |
During presolve, we apply BVE only if this weight times the number of clauses plus the number of clause literals is not increased.
optional int32 presolve_bve_clause_weight = 55 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3781 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPresolveBveThreshold | ( | ) |
During presolve, only try to perform the bounded variable elimination (BVE) of a variable x if the number of occurrences of x times the number of occurrences of not(x) is not greater than this parameter.
optional int32 presolve_bve_threshold = 54 [default = 500];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3752 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPresolveExtractIntegerEnforcement | ( | ) |
If true, we will extract from linear constraints, enforcement literals of the form "integer variable at bound => simplified constraint". This should always be beneficial except that we don't always handle them as efficiently as we could for now. This causes problem on manna81.mps (LP relaxation not as tight it seems) and on neos-3354841-apure.mps.gz (too many literals created this way).
optional bool presolve_extract_integer_enforcement = 174 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4346 of file SatParameters.java.
| long com.google.ortools.sat.SatParameters.getPresolveInclusionWorkLimit | ( | ) |
A few presolve operations involve detecting constraints included in other constraint. Since there can be a quadratic number of such pairs, and processing them usually involve scanning them, the complexity of these operations can be big. This enforce a local deterministic limit on the number of entries scanned. Default is 1e8. A value of zero will disable these presolve rules completely.
optional int64 presolve_inclusion_work_limit = 201 [default = 100000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4385 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getPresolveProbingDeterministicTimeLimit | ( | ) |
optional double presolve_probing_deterministic_time_limit = 57 [default = 30];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3835 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getPresolveSubstitutionLevel | ( | ) |
How much substitution (also called free variable aggregation in MIP litterature) should we perform at presolve. This currently only concerns variable appearing only in linear constraints. For now the value 0 turns it off and any positive value performs substitution.
optional int32 presolve_substitution_level = 147 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4309 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPresolveUseBva | ( | ) |
Whether or not we use Bounded Variable Addition (BVA) in the presolve.
optional bool presolve_use_bva = 72 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3891 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getProbingDeterministicTimeLimit | ( | ) |
The maximum "deterministic" time limit to spend in probing. A value of zero will disable the probing. TODO(user): Clean up. The first one is used in CP-SAT, the other in pure SAT presolve.
optional double probing_deterministic_time_limit = 226 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3816 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getProbingNumCombinationsLimit | ( | ) |
How many combinations of pairs or triplets of variables we want to scan.
optional int32 probing_num_combinations_limit = 272 [default = 20000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6241 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getPropagationLoopDetectionFactor | ( | ) |
Some search decisions might cause a really large number of propagations to happen when integer variables with large domains are only reduced by 1 at each step. If we propagate more than the number of variable times this parameters we try to take counter-measure. Setting this to 0.0 disable this feature. TODO(user): Setting this to something like 10 helps in most cases, but the code is currently buggy and can cause the solve to enter a bad state where no progress is made.
optional double propagation_loop_detection_factor = 221 [default = 10];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5521 of file SatParameters.java.
| long com.google.ortools.sat.SatParameters.getPseudoCostReliabilityThreshold | ( | ) |
The solver ignores the pseudo costs of variables with number of recordings less than this threshold.
optional int64 pseudo_cost_reliability_threshold = 123 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6388 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getPushAllTasksTowardStart | ( | ) |
Experimental code: specify if the objective pushes all tasks toward the start of the schedule.
optional bool push_all_tasks_toward_start = 262 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7598 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getRandomBranchesRatio | ( | ) |
A number between 0 and 1 that indicates the proportion of branching variables that are selected randomly instead of choosing the first variable from the given variable_ordering strategy.
optional double random_branches_ratio = 32 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2203 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getRandomizeSearch | ( | ) |
Randomize fixed search.
optional bool randomize_search = 103 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7538 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getRandomPolarityRatio | ( | ) |
The proportion of polarity chosen at random. Note that this take precedence over the phase saving heuristic. This is different from initial_polarity:POLARITY_RANDOM because it will select a new random polarity each time the variable is branched upon instead of selecting one initially and then always taking this choice.
optional double random_polarity_ratio = 45 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2172 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getRandomSeed | ( | ) |
At the beginning of each solve, the random number generator used in some part of the solver is reinitialized to this seed. If you change the random seed, the solver may make different choices during the solving process. For some problems, the running time may vary a lot depending on small change in the solving algorithm. Running the solver with different seeds enables to have more robust benchmarks when evaluating new features.
optional int32 random_seed = 31 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3362 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getRelativeGapLimit | ( | ) |
optional double relative_gap_limit = 160 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3323 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getRepairHint | ( | ) |
If true, the solver tries to repair the solution given in the hint. This search terminates after the 'hint_conflict_limit' is reached and the solver switches to regular search. If false, then we do a FIXED_SEARCH using the hint until the hint_conflict_limit is reached.
optional bool repair_hint = 167 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6127 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.RestartAlgorithm com.google.ortools.sat.SatParameters.getRestartAlgorithms | ( | int | index | ) |
The restart strategies will change each time the strategy_counter is increased. The current strategy will simply be the one at index strategy_counter modulo the number of strategy. Note that if this list includes a NO_RESTART, nothing will change when it is reached because the strategy_counter will only increment after a restart. The idea of switching of search strategy tailored for SAT/UNSAT comes from Chanseok Oh with his COMiniSatPS solver, see http://cs.nyu.edu/~chanseok/. But more generally, it seems REALLY beneficial to try different strategy.
repeated .operations_research.sat.SatParameters.RestartAlgorithm restart_algorithms = 61;
| index | The index of the element to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2825 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getRestartAlgorithmsCount | ( | ) |
The restart strategies will change each time the strategy_counter is increased. The current strategy will simply be the one at index strategy_counter modulo the number of strategy. Note that if this list includes a NO_RESTART, nothing will change when it is reached because the strategy_counter will only increment after a restart. The idea of switching of search strategy tailored for SAT/UNSAT comes from Chanseok Oh with his COMiniSatPS solver, see http://cs.nyu.edu/~chanseok/. But more generally, it seems REALLY beneficial to try different strategy.
repeated .operations_research.sat.SatParameters.RestartAlgorithm restart_algorithms = 61;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2804 of file SatParameters.java.
| java.util.List< com.google.ortools.sat.SatParameters.RestartAlgorithm > com.google.ortools.sat.SatParameters.getRestartAlgorithmsList | ( | ) |
The restart strategies will change each time the strategy_counter is increased. The current strategy will simply be the one at index strategy_counter modulo the number of strategy. Note that if this list includes a NO_RESTART, nothing will change when it is reached because the strategy_counter will only increment after a restart. The idea of switching of search strategy tailored for SAT/UNSAT comes from Chanseok Oh with his COMiniSatPS solver, see http://cs.nyu.edu/~chanseok/. But more generally, it seems REALLY beneficial to try different strategy.
repeated .operations_research.sat.SatParameters.RestartAlgorithm restart_algorithms = 61;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2783 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getRestartDlAverageRatio | ( | ) |
In the moving average restart algorithms, a restart is triggered if the window average times this ratio is greater that the global average.
optional double restart_dl_average_ratio = 63 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2959 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getRestartLbdAverageRatio | ( | ) |
optional double restart_lbd_average_ratio = 71 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2978 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getRestartPeriod | ( | ) |
Restart period for the FIXED_RESTART strategy. This is also the multiplier used by the LUBY_RESTART strategy.
optional int32 restart_period = 30 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2903 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getRestartRunningWindowSize | ( | ) |
Size of the window for the moving average restarts.
optional int32 restart_running_window_size = 62 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2930 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getRootLpIterations | ( | ) |
Even at the root node, we do not want to spend too much time on the LP if it is "difficult". So we solve it in "chunks" of that many iterations. The solve will be continued down in the tree or the next time we go back to the root node.
optional int32 root_lp_iterations = 227 [default = 2000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8540 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.SearchBranching com.google.ortools.sat.SatParameters.getSearchBranching | ( | ) |
optional .operations_research.sat.SatParameters.SearchBranching search_branching = 82 [default = AUTOMATIC_SEARCH];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6066 of file SatParameters.java.
| long com.google.ortools.sat.SatParameters.getSearchRandomVariablePoolSize | ( | ) |
Search randomization will collect the top 'search_random_variable_pool_size' valued variables, and pick one randomly. The value of the variable is specific to each strategy.
optional int64 search_random_variable_pool_size = 104 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7569 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSerializedSize | ( | ) |
Definition at line 10119 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getShareBinaryClauses | ( | ) |
Allows sharing of new learned binary clause between workers.
optional bool share_binary_clauses = 203 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5200 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSharedTreeMaxNodesPerWorker | ( | ) |
In order to limit total shared memory and communication overhead, limit the total number of nodes that may be generated in the shared tree. If the shared tree runs out of unassigned leaves, workers act as portfolio workers. Note: this limit includes interior nodes, not just leaves.
optional int32 shared_tree_max_nodes_per_worker = 238 [default = 128];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7004 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSharedTreeNumWorkers | ( | ) |
Enables experimental workstealing-like shared tree search. If non-zero, start this many complete worker threads to explore a shared search tree. These workers communicate objective bounds and simple decision nogoods relating to the shared prefix of the tree, and will avoid exploring the same subtrees as one another.
optional int32 shared_tree_num_workers = 235 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6913 of file SatParameters.java.
| com.google.ortools.sat.SatParameters.SharedTreeSplitStrategy com.google.ortools.sat.SatParameters.getSharedTreeSplitStrategy | ( | ) |
optional .operations_research.sat.SatParameters.SharedTreeSplitStrategy shared_tree_split_strategy = 239 [default = SPLIT_STRATEGY_AUTO];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7021 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getSharedTreeWorkerObjectiveSplitProbability | ( | ) |
After their assigned prefix, shared tree workers will branch on the objective with this probability. Higher numbers cause the shared tree search to focus on improving the lower bound over finding primal solutions.
optional double shared_tree_worker_objective_split_probability = 237 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6971 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getShareLevelZeroBounds | ( | ) |
Allows sharing of the bounds of modified variables at level 0.
optional bool share_level_zero_bounds = 114 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5173 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getShareObjectiveBounds | ( | ) |
Allows objective sharing between workers.
optional bool share_objective_bounds = 113 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5146 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getShavingSearchDeterministicTime | ( | ) |
Specifies the amount of deterministic time spent of each try at shaving a bound in the shaving search.
optional double shaving_search_deterministic_time = 205 [default = 0.001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6299 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSolutionPoolSize | ( | ) |
Size of the top-n different solutions kept by the solver. This parameter must be > 0. Currently this only impact the "base" solution chosen for a LNS fragment.
optional int32 solution_pool_size = 193 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7381 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getStopAfterFirstSolution | ( | ) |
For an optimization problem, stop the solver as soon as we have a solution.
optional bool stop_after_first_solution = 98 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7275 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getStopAfterPresolve | ( | ) |
Mainly used when improving the presolver. When true, stops the solver after the presolve is complete (or after loading and root level propagation).
optional bool stop_after_presolve = 149 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7304 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getStopAfterRootPropagation | ( | ) |
optional bool stop_after_root_propagation = 252 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7323 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getStrategyChangeIncreaseRatio | ( | ) |
The parameter num_conflicts_before_strategy_changes is increased by that much after each strategy change.
optional double strategy_change_increase_ratio = 69 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3107 of file SatParameters.java.
| com.google.ortools.sat.SatParameters com.google.ortools.sat.SatParameters.getSubsolverParams | ( | int | index | ) |
It is possible to specify additional subsolver configuration. These can be referred by their params.name() in the fields above. Note that only the specified field will "overwrite" the ones of the base parameter. If a subsolver_params has the name of an existing subsolver configuration, the named parameters will be merged into the subsolver configuration.
repeated .operations_research.sat.SatParameters subsolver_params = 210;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5047 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSubsolverParamsCount | ( | ) |
It is possible to specify additional subsolver configuration. These can be referred by their params.name() in the fields above. Note that only the specified field will "overwrite" the ones of the base parameter. If a subsolver_params has the name of an existing subsolver configuration, the named parameters will be merged into the subsolver configuration.
repeated .operations_research.sat.SatParameters subsolver_params = 210;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5032 of file SatParameters.java.
| java.util.List< com.google.ortools.sat.SatParameters > com.google.ortools.sat.SatParameters.getSubsolverParamsList | ( | ) |
It is possible to specify additional subsolver configuration. These can be referred by their params.name() in the fields above. Note that only the specified field will "overwrite" the ones of the base parameter. If a subsolver_params has the name of an existing subsolver configuration, the named parameters will be merged into the subsolver configuration.
repeated .operations_research.sat.SatParameters subsolver_params = 210;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5001 of file SatParameters.java.
| com.google.ortools.sat.SatParametersOrBuilder com.google.ortools.sat.SatParameters.getSubsolverParamsOrBuilder | ( | int | index | ) |
It is possible to specify additional subsolver configuration. These can be referred by their params.name() in the fields above. Note that only the specified field will "overwrite" the ones of the base parameter. If a subsolver_params has the name of an existing subsolver configuration, the named parameters will be merged into the subsolver configuration.
repeated .operations_research.sat.SatParameters subsolver_params = 210;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5062 of file SatParameters.java.
| java.util.List<? extends com.google.ortools.sat.SatParametersOrBuilder > com.google.ortools.sat.SatParameters.getSubsolverParamsOrBuilderList | ( | ) |
It is possible to specify additional subsolver configuration. These can be referred by their params.name() in the fields above. Note that only the specified field will "overwrite" the ones of the base parameter. If a subsolver_params has the name of an existing subsolver configuration, the named parameters will be merged into the subsolver configuration.
repeated .operations_research.sat.SatParameters subsolver_params = 210;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5017 of file SatParameters.java.
| java.lang.String com.google.ortools.sat.SatParameters.getSubsolvers | ( | int | index | ) |
In multi-thread, the solver can be mainly seen as a portfolio of solvers with different parameters. This field indicates the names of the parameters that are used in multithread. See cp_model_search.cc to see a list of the names and the default value (if left empty) that looks like: - default_lp (linearization_level:1) - fixed (only if fixed search specified or scheduling) - no_lp (linearization_level:0) - max_lp (linearization_level:2) - pseudo_costs (only if objective, change search heuristic) - reduced_costs (only if objective, change search heuristic) - quick_restart (kind of probing) - quick_restart_no_lp (kind of probing with linearization_level:0) - lb_tree_search (to improve lower bound, MIP like tree search) - probing (continuous probing and shaving) Also, note that some set of parameters will be ignored if they do not make sense. For instance if there is no objective, pseudo_cost or reduced_cost search will be ignored. Core based search will only work if the objective has many terms. If there is no fixed strategy fixed will be ignored. And so on. The order is important, as only the first usable "num_workers - min_num_lns_workers" subsolvers will be scheduled. You can see in the log which one are selected for a given run. All the others will be LNS if there is an objective, or randomized SAT search for pure satisfiability problems.
repeated string subsolvers = 207;
| index | The index of the element to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4829 of file SatParameters.java.
| com.google.protobuf.ByteString com.google.ortools.sat.SatParameters.getSubsolversBytes | ( | int | index | ) |
In multi-thread, the solver can be mainly seen as a portfolio of solvers with different parameters. This field indicates the names of the parameters that are used in multithread. See cp_model_search.cc to see a list of the names and the default value (if left empty) that looks like: - default_lp (linearization_level:1) - fixed (only if fixed search specified or scheduling) - no_lp (linearization_level:0) - max_lp (linearization_level:2) - pseudo_costs (only if objective, change search heuristic) - reduced_costs (only if objective, change search heuristic) - quick_restart (kind of probing) - quick_restart_no_lp (kind of probing with linearization_level:0) - lb_tree_search (to improve lower bound, MIP like tree search) - probing (continuous probing and shaving) Also, note that some set of parameters will be ignored if they do not make sense. For instance if there is no objective, pseudo_cost or reduced_cost search will be ignored. Core based search will only work if the objective has many terms. If there is no fixed strategy fixed will be ignored. And so on. The order is important, as only the first usable "num_workers - min_num_lns_workers" subsolvers will be scheduled. You can see in the log which one are selected for a given run. All the others will be LNS if there is an objective, or randomized SAT search for pure satisfiability problems.
repeated string subsolvers = 207;
| index | The index of the value to return. |
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4868 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSubsolversCount | ( | ) |
In multi-thread, the solver can be mainly seen as a portfolio of solvers with different parameters. This field indicates the names of the parameters that are used in multithread. See cp_model_search.cc to see a list of the names and the default value (if left empty) that looks like: - default_lp (linearization_level:1) - fixed (only if fixed search specified or scheduling) - no_lp (linearization_level:0) - max_lp (linearization_level:2) - pseudo_costs (only if objective, change search heuristic) - reduced_costs (only if objective, change search heuristic) - quick_restart (kind of probing) - quick_restart_no_lp (kind of probing with linearization_level:0) - lb_tree_search (to improve lower bound, MIP like tree search) - probing (continuous probing and shaving) Also, note that some set of parameters will be ignored if they do not make sense. For instance if there is no objective, pseudo_cost or reduced_cost search will be ignored. Core based search will only work if the objective has many terms. If there is no fixed strategy fixed will be ignored. And so on. The order is important, as only the first usable "num_workers - min_num_lns_workers" subsolvers will be scheduled. You can see in the log which one are selected for a given run. All the others will be LNS if there is an objective, or randomized SAT search for pure satisfiability problems.
repeated string subsolvers = 207;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4791 of file SatParameters.java.
| com.google.protobuf.ProtocolStringList com.google.ortools.sat.SatParameters.getSubsolversList | ( | ) |
In multi-thread, the solver can be mainly seen as a portfolio of solvers with different parameters. This field indicates the names of the parameters that are used in multithread. See cp_model_search.cc to see a list of the names and the default value (if left empty) that looks like: - default_lp (linearization_level:1) - fixed (only if fixed search specified or scheduling) - no_lp (linearization_level:0) - max_lp (linearization_level:2) - pseudo_costs (only if objective, change search heuristic) - reduced_costs (only if objective, change search heuristic) - quick_restart (kind of probing) - quick_restart_no_lp (kind of probing with linearization_level:0) - lb_tree_search (to improve lower bound, MIP like tree search) - probing (continuous probing and shaving) Also, note that some set of parameters will be ignored if they do not make sense. For instance if there is no objective, pseudo_cost or reduced_cost search will be ignored. Core based search will only work if the objective has many terms. If there is no fixed strategy fixed will be ignored. And so on. The order is important, as only the first usable "num_workers - min_num_lns_workers" subsolvers will be scheduled. You can see in the log which one are selected for a given run. All the others will be LNS if there is an objective, or randomized SAT search for pure satisfiability problems.
repeated string subsolvers = 207;
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4754 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getSubsumptionDuringConflictAnalysis | ( | ) |
At a really low cost, during the 1-UIP conflict computation, it is easy to detect if some of the involved reasons are subsumed by the current conflict. When this is true, such clauses are detached and later removed from the problem.
optional bool subsumption_during_conflict_analysis = 56 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2373 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getSymmetryLevel | ( | ) |
Whether we try to automatically detect the symmetries in a model and exploit them. Currently, at level 1 we detect them in presolve and try to fix Booleans. At level 2, we also do some form of dynamic symmetry breaking during search.
optional int32 symmetry_level = 183 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7941 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getTableCompressionLevel | ( | ) |
How much we try to "compress" a table constraint. Compressing more leads to less Booleans and faster propagation but can reduced the quality of the lp relaxation. Values goes from 0 to 3 where we always try to fully compress a table. At 2, we try to automatically decide if it is worth it.
optional int32 table_compression_level = 217 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4106 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getTestFeasibilityJump | ( | ) |
Disable every other type of subsolver, setting this turns CP-SAT into a pure local-search solver.
optional bool test_feasibility_jump = 240 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6586 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseAbslRandom | ( | ) |
optional bool use_absl_random = 180 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3433 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseAreaEnergeticReasoningInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with an energetic reasoning that uses an area-based energy. This can be combined with the two other overlap heuristics above.
optional bool use_area_energetic_reasoning_in_no_overlap_2d = 271 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5987 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseBlockingRestart | ( | ) |
Block a moving restart algorithm if the trail size of the current conflict is greater than the multiplier times the moving average of the trail size at the previous conflicts.
optional bool use_blocking_restart = 64 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3009 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseCombinedNoOverlap | ( | ) |
This can be beneficial if there is a lot of no-overlap constraints but a relatively low number of different intervals in the problem. Like 1000 intervals, but 1M intervals in the no-overlap constraints covering them.
optional bool use_combined_no_overlap = 133 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7699 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseDisjunctiveConstraintInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with propagators from the disjunctive constraint to improve the inference on a set of tasks that are disjunctive at the root of the problem. This additional level supplements the default level of reasoning. Propagators of the cumulative constraint will not be used at all if all the tasks are disjunctive at root node. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_disjunctive_constraint_in_cumulative = 80 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5890 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseDualSchedulingHeuristics | ( | ) |
When set, it activates a few scheduling parameters to improve the lower bound of scheduling problems. This is only effective with multiple workers as it modifies the reduced_cost, lb_tree_search, and probing workers.
optional bool use_dual_scheduling_heuristics = 214 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6049 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseDynamicPrecedenceInCumulative | ( | ) |
optional bool use_dynamic_precedence_in_cumulative = 268 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5682 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseDynamicPrecedenceInDisjunctive | ( | ) |
Whether we try to branch on decision "interval A before interval B" rather than on intervals bounds. This usually works better, but slow down a bit the time to find the first solution. These parameters are still EXPERIMENTAL, the result should be correct, but it some corner cases, they can cause some failing CHECK in the solver.
optional bool use_dynamic_precedence_in_disjunctive = 263 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5663 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseEnergeticReasoningInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with energetic reasoning. This additional level supplements the default level of reasoning.
optional bool use_energetic_reasoning_in_no_overlap_2d = 213 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5956 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseErwaHeuristic | ( | ) |
Whether we use the ERWA (Exponential Recency Weighted Average) heuristic as described in "Learning Rate Based Branching Heuristic for SAT solvers", J.H.Liang, V. Ganesh, P. Poupart, K.Czarnecki, SAT 2016.
optional bool use_erwa_heuristic = 75 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2234 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseExactLpReason | ( | ) |
The solver usually exploit the LP relaxation of a model. If this option is true, then whatever is infered by the LP will be used like an heuristic to compute EXACT propagation on the IP. So with this option, there is no numerical imprecision issues.
optional bool use_exact_lp_reason = 109 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7668 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseExtendedProbing | ( | ) |
Use extended probing (probe bool_or, at_most_one, exactly_one).
optional bool use_extended_probing = 269 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6214 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseFeasibilityJump | ( | ) |
Parameters for an heuristic similar to the one described in the paper: "Feasibility Jump: an LP-free Lagrangian MIP heuristic", Bjørnar Luteberget, Giorgio Sartor, 2023, Mathematical Programming Computation.
optional bool use_feasibility_jump = 265 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6557 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseFeasibilityPump | ( | ) |
Adds a feasibility pump subsolver along with lns subsolvers.
optional bool use_feasibility_pump = 164 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7435 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseHardPrecedencesInCumulative | ( | ) |
If true, detect and create constraint for integer variable that are "after" a set of intervals in the same cumulative constraint. Experimental: by default we just use "direct" precedences. If exploit_all_precedences is true, we explore the full precedence graph. This assumes we have a DAG otherwise it fails.
optional bool use_hard_precedences_in_cumulative = 215 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5826 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseImpliedBounds | ( | ) |
Stores and exploits "implied-bounds" in the solver. That is, relations of the form literal => (var >= bound). This is currently used to derive stronger cuts.
optional bool use_implied_bounds = 144 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7790 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseLbRelaxLns | ( | ) |
Turns on neighborhood generator based on local branching LP. Based on Huang et al., "Local Branching Relaxation Heuristics for Integer Linear Programs", 2023.
optional bool use_lb_relax_lns = 255 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7466 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseLnsOnly | ( | ) |
LNS parameters.
optional bool use_lns_only = 101 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7350 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseObjectiveLbSearch | ( | ) |
If true, search will search in ascending max objective value (when minimizing) starting from the lower bound of the objective.
optional bool use_objective_lb_search = 228 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6328 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseObjectiveShavingSearch | ( | ) |
This search differs from the previous search as it will not use assumptions to bound the objective, and it will recreate a full model with the hardcoded objective value.
optional bool use_objective_shaving_search = 253 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6359 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseOptimizationHints | ( | ) |
For an optimization problem, whether we follow some hints in order to find a better first solution. For a variable with hint, the solver will always try to follow the hint. It will revert to the variable_branching default otherwise.
optional bool use_optimization_hints = 35 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5320 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseOptionalVariables | ( | ) |
If true, we automatically detect variables whose constraint are always enforced by the same literal and we mark them as optional. This allows to propagate them as if they were present in some situation. TODO(user): This is experimental and seems to lead to wrong optimal in some situation. It should however gives correct solutions. Fix.
optional bool use_optional_variables = 108 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7635 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseOverloadCheckerInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with overload checking, i.e., an additional level of reasoning based on energy. This additional level supplements the default level of reasoning as well as timetable edge finding. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_overload_checker_in_cumulative = 78 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5721 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUsePbResolution | ( | ) |
Whether to use pseudo-Boolean resolution to analyze a conflict. Note that this option only make sense if your problem is modelized using pseudo-Boolean constraints. If you only have clauses, this shouldn't change anything (except slow the solver down).
optional bool use_pb_resolution = 43 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3645 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUsePhaseSaving | ( | ) |
If this is true, then the polarity of a variable will be the last value it was assigned to, or its default polarity if it was never assigned since the call to ResetDecisionHeuristic(). Actually, we use a newer version where we follow the last value in the longest non-conflicting partial assignment in the current phase. This is called 'literal phase saving'. For details see 'A Lightweight Component Caching Scheme for Satisfiability Solvers' K. Pipatsrisawat and A.Darwiche, In 10th International Conference on Theory and Applications of Satisfiability Testing, 2007.
optional bool use_phase_saving = 44 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2106 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUsePrecedencesInDisjunctiveConstraint | ( | ) |
When this is true, then a disjunctive constraint will try to use the precedence relations between time intervals to propagate their bounds further. For instance if task A and B are both before C and task A and B are in disjunction, then we can deduce that task C must start after duration(A) + duration(B) instead of simply max(duration(A), duration(B)), provided that the start time for all task was currently zero. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_precedences_in_disjunctive_constraint = 74 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5564 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseProbingSearch | ( | ) |
If true, search will continuously probe Boolean variables, and integer variable bounds. This parameter is set to true in parallel on the probing worker.
optional bool use_probing_search = 176 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6187 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseRinsLns | ( | ) |
Turns on relaxation induced neighborhood generator.
optional bool use_rins_lns = 129 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7408 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseSatInprocessing | ( | ) |
Enable or disable "inprocessing" which is some SAT presolving done at each restart to the root level.
optional bool use_sat_inprocessing = 163 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4509 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseSharedTreeSearch | ( | ) |
Set on shared subtree workers. Users should not set this directly.
optional bool use_shared_tree_search = 236 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6940 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseShavingInProbingSearch | ( | ) |
Add a shaving phase (where the solver tries to prove that the lower or upper bound of a variable are infeasible) to the probing search.
optional bool use_shaving_in_probing_search = 204 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6270 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseStrongPropagationInDisjunctive | ( | ) |
Enable stronger and more expensive propagation on no_overlap constraint.
optional bool use_strong_propagation_in_disjunctive = 230 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5626 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseTimetableEdgeFindingInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with timetable edge finding, i.e., an additional level of reasoning based on the conjunction of energy and mandatory parts. This additional level supplements the default level of reasoning as well as overload_checker. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_timetable_edge_finding_in_cumulative = 79 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5760 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.getUseTimetablingInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with propagators from the cumulative constraints. It consists of ignoring the position of rectangles in one position and projecting the no_overlap_2d on the other dimension to create a cumulative constraint. This is done on both axis. This additional level supplements the default level of reasoning.
optional bool use_timetabling_in_no_overlap_2d = 200 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5925 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getVariableActivityDecay | ( | ) |
Each time a conflict is found, the activities of some variables are increased by one. Then, the activity of all variables are multiplied by variable_activity_decay. To implement this efficiently, the activity of all the variables is not decayed at each conflict. Instead, the activity increment is multiplied by 1 / decay. When an activity reach max_variable_activity_value, all the activity are multiplied by 1 / max_variable_activity_value.
optional double variable_activity_decay = 15 [default = 0.8];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2612 of file SatParameters.java.
| double com.google.ortools.sat.SatParameters.getViolationLsCompoundMoveProbability | ( | ) |
Probability of using compound move search each restart. TODO(user): Add reference to paper when published.
optional double violation_ls_compound_move_probability = 259 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6878 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.getViolationLsPerturbationPeriod | ( | ) |
How long violation_ls should wait before perturbating a solution.
optional int32 violation_ls_perturbation_period = 249 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6849 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAbsoluteGapLimit | ( | ) |
Stop the search when the gap between the best feasible objective (O) and our best objective bound (B) is smaller than a limit. The exact definition is: - Absolute: abs(O - B) - Relative: abs(O - B) / max(1, abs(O)). Important: The relative gap depends on the objective offset! If you artificially shift the objective, you will get widely different value of the relative gap. Note that if the gap is reached, the search status will be OPTIMAL. But one can check the best objective bound to see the actual gap. If the objective is integer, then any absolute gap < 1 will lead to a true optimal. If the objective is floating point, a gap of zero make little sense so is is why we use a non-zero default value. At the end of the search, we will display a warning if OPTIMAL is reported yet the gap is greater than this absolute gap.
optional double absolute_gap_limit = 159 [default = 0.0001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3275 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddCgCuts | ( | ) |
Whether we generate and add Chvatal-Gomory cuts to the LP at root node. Note that for now, this is not heavily tuned.
optional bool add_cg_cuts = 117 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8240 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddCliqueCuts | ( | ) |
Whether we generate clique cuts from the binary implication graph. Note that as the search goes on, this graph will contains new binary clauses learned by the SAT engine.
optional bool add_clique_cuts = 172 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8328 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddLinMaxCuts | ( | ) |
For the lin max constraints, generates the cuts described in "Strong mixed-integer programming formulations for trained neural networks" by Ross Anderson et. (https://arxiv.org/pdf/1811.01988.pdf)
optional bool add_lin_max_cuts = 152 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8419 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddLpConstraintsLazily | ( | ) |
If true, we start by an empty LP, and only add constraints not satisfied by the current LP solution batch by batch. A constraint that is only added like this is known as a "lazy" constraint in the literature, except that we currently consider all constraints as lazy here.
optional bool add_lp_constraints_lazily = 112 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8492 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddMirCuts | ( | ) |
Whether we generate MIR cuts at root node. Note that for now, this is not heavily tuned.
optional bool add_mir_cuts = 120 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8269 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddObjectiveCut | ( | ) |
When the LP objective is fractional, do we add the cut that forces the linear objective expression to be greater or equal to this fractional value rounded up? We can always do that since our objective is integer, and combined with MIR heuristic to reduce the coefficient of such cut, it can help.
optional bool add_objective_cut = 197 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8208 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddRltCuts | ( | ) |
Whether we generate RLT cuts. This is still experimental but can help on binary problem with a lot of clauses of size 3.
optional bool add_rlt_cuts = 279 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8358 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAddZeroHalfCuts | ( | ) |
Whether we generate Zero-Half cuts at root node. Note that for now, this is not heavily tuned.
optional bool add_zero_half_cuts = 169 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8298 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAlsoBumpVariablesInConflictReasons | ( | ) |
When this is true, then the variables that appear in any of the reason of the variables in a conflict have their activity bumped. This is addition to the variables in the conflict, and the one that were used during conflict resolution.
optional bool also_bump_variables_in_conflict_reasons = 77 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2289 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAtMostOneMaxExpansionSize | ( | ) |
All at_most_one constraints with a size <= param will be replaced by a quadratic number of binary implications.
optional int32 at_most_one_max_expansion_size = 270 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7715 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasAutoDetectGreaterThanAtLeastOneOf | ( | ) |
If true, then the precedences propagator try to detect for each variable if it has a set of "optional incoming arc" for which at least one of them is present. This is usually useful to have but can be slow on model with a lot of precedence.
optional bool auto_detect_greater_than_at_least_one_of = 95 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7233 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasBinaryMinimizationAlgorithm | ( | ) |
optional .operations_research.sat.SatParameters.BinaryMinizationAlgorithm binary_minimization_algorithm = 34 [default = BINARY_MINIMIZATION_FIRST];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2332 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasBinarySearchNumConflicts | ( | ) |
If non-negative, perform a binary search on the objective variable in order to find an [min, max] interval outside of which the solver proved unsat/sat under this amount of conflict. This can quickly reduce the objective domain on some problems.
optional int32 binary_search_num_conflicts = 99 [default = -1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6474 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasBlockingRestartMultiplier | ( | ) |
optional double blocking_restart_multiplier = 66 [default = 1.4];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3039 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasBlockingRestartWindowSize | ( | ) |
optional int32 blocking_restart_window_size = 65 [default = 5000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3020 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasBooleanEncodingLevel | ( | ) |
A non-negative level indicating how much we should try to fully encode Integer variables as Boolean.
optional int32 boolean_encoding_level = 107 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8048 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCatchSigintSignal | ( | ) |
Indicates if the CP-SAT layer should catch Control-C (SIGINT) signals when calling solve. If set, catching the SIGINT signal will terminate the search gracefully, as if a time limit was reached.
optional bool catch_sigint_signal = 135 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7745 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseActivityDecay | ( | ) |
Clause activity parameters (same effect as the one on the variables).
optional double clause_activity_decay = 17 [default = 0.999];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2719 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupLbdBound | ( | ) |
All the clauses with a LBD (literal blocks distance) lower or equal to this parameters will always be kept.
optional int32 clause_cleanup_lbd_bound = 59 [default = 5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2494 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupOrdering | ( | ) |
optional .operations_research.sat.SatParameters.ClauseOrdering clause_cleanup_ordering = 60 [default = CLAUSE_ACTIVITY];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2517 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupPeriod | ( | ) |
Trigger a cleanup when this number of "deletable" clauses is learned.
optional int32 clause_cleanup_period = 11 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2388 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupProtection | ( | ) |
optional .operations_research.sat.SatParameters.ClauseProtection clause_cleanup_protection = 58 [default = PROTECTION_NONE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2470 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupRatio | ( | ) |
During a cleanup, if clause_cleanup_target is 0, we will delete the clause_cleanup_ratio of "deletable" clauses instead of aiming for a fixed target of clauses to keep.
optional double clause_cleanup_ratio = 190 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2446 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasClauseCleanupTarget | ( | ) |
During a cleanup, we will always keep that number of "deletable" clauses. Note that this doesn't include the "protected" clauses.
optional int32 clause_cleanup_target = 13 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2416 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasConvertIntervals | ( | ) |
Temporary flag util the feature is more mature. This convert intervals to the newer proto format that support affine start/var/end instead of just variables.
optional bool convert_intervals = 177 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7894 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCoreMinimizationLevel | ( | ) |
If positive, we spend some effort on each core: - At level 1, we use a simple heuristic to try to minimize an UNSAT core. - At level 2, we use propagation to minimize the core but also identify literal in at most one relationship in this core.
optional int32 core_minimization_level = 50 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5338 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCountAssumptionLevelsInLbd | ( | ) |
Whether or not the assumption levels are taken into account during the LBD computation. According to the reference below, not counting them improves the solver in some situation. Note that this only impact solves under assumptions. Gilles Audemard, Jean-Marie Lagniez, Laurent Simon, "Improving Glucose for Incremental SAT Solving with Assumptions: Application to MUS Extraction" Theory and Applications of Satisfiability Testing - SAT 2013, Lecture Notes in Computer Science Volume 7962, 2013, pp 309-317.
optional bool count_assumption_levels_in_lbd = 49 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3701 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCoverOptimization | ( | ) |
If true, when the max-sat algo find a core, we compute the minimal number of literals in the core that needs to be true to have a feasible solution. This is also called core exhaustion in more recent max-SAT papers.
optional bool cover_optimization = 89 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5399 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCpModelPresolve | ( | ) |
Whether we presolve the cp_model before solving it.
optional bool cp_model_presolve = 86 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3970 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCpModelProbingLevel | ( | ) |
How much effort do we spend on probing. 0 disables it completely.
optional int32 cp_model_probing_level = 110 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3997 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCpModelUseSatPresolve | ( | ) |
Whether we also use the sat presolve when cp_model_presolve is true.
optional bool cp_model_use_sat_presolve = 93 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4024 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCutActiveCountDecay | ( | ) |
optional double cut_active_count_decay = 156 [default = 0.8];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8675 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCutCleanupTarget | ( | ) |
Target number of constraints to remove during cleanup.
optional int32 cut_cleanup_target = 157 [default = 1000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8698 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCutLevel | ( | ) |
Control the global cut effort. Zero will turn off all cut. For now we just have one level. Note also that most cuts are only used at linearization level >= 2.
optional int32 cut_level = 196 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8146 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasCutMaxActiveCountValue | ( | ) |
These parameters are similar to sat clause management activity parameters. They are effective only if the number of generated cuts exceed the storage limit. Default values are based on a few experiments on miplib instances.
optional double cut_max_active_count_value = 155 [default = 10000000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8650 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDebugCrashOnBadHint | ( | ) |
Crash if we do not manage to complete the hint into a full solution.
optional bool debug_crash_on_bad_hint = 195 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5275 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDebugMaxNumPresolveOperations | ( | ) |
If positive, try to stop just after that many presolve rules have been applied. This is mainly useful for debugging presolve.
optional int32 debug_max_num_presolve_operations = 151 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5247 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDebugPostsolveWithFullSolver | ( | ) |
We have two different postsolve code. The default one should be better and it allows for a more powerful presolve, but it can be useful to postsolve using the full solver instead.
optional bool debug_postsolve_with_full_solver = 162 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5217 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDefaultRestartAlgorithms | ( | ) |
optional string default_restart_algorithms = 70 [default = "LUBY_RESTART,LBD_MOVING_AVERAGE_RESTART,DL_MOVING_AVERAGE_RESTART"];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2837 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDetectLinearizedProduct | ( | ) |
Infer products of Boolean or of Boolean time IntegerVariable from the linear constrainst in the problem. This can be used in some cuts, altough for now we don't really exploit it.
optional bool detect_linearized_product = 277 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8907 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDetectTableWithCost | ( | ) |
If true, we detect variable that are unique to a table constraint and only there to encode a cost on each tuple. This is usually the case when a WCSP (weighted constraint program) is encoded into CP-SAT format. This can lead to a dramatic speed-up for such problems but is still experimental at this point.
optional bool detect_table_with_cost = 216 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4056 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDisableConstraintExpansion | ( | ) |
If true, it disable all constraint expansion. This should only be used to test the presolve of expanded constraints.
optional bool disable_constraint_expansion = 181 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4180 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasDiversifyLnsParams | ( | ) |
If true, registers more lns subsolvers with different parameters.
optional bool diversify_lns_params = 137 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7499 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasEncodeComplexLinearConstraintWithInteger | ( | ) |
Linear constraint with a complex right hand side (more than a single interval) need to be expanded, there is a couple of way to do that.
optional bool encode_complex_linear_constraint_with_integer = 223 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4209 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasEnumerateAllSolutions | ( | ) |
Whether we enumerate all solutions of a problem without objective. Note that setting this to true automatically disable some presolve reduction that can remove feasible solution. That is it has the same effect as setting keep_all_feasible_solutions_in_presolve. TODO(user): Do not do that and let the user choose what behavior is best by setting keep_all_feasible_solutions_in_presolve ?
optional bool enumerate_all_solutions = 87 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7043 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExpandAlldiffConstraints | ( | ) |
If true, expand all_different constraints that are not permutations. Permutations (#Variables = #Values) are always expanded.
optional bool expand_alldiff_constraints = 170 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4122 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExpandReservoirConstraints | ( | ) |
If true, expand the reservoir constraints by creating booleans for all possible precedences between event and encoding the constraint.
optional bool expand_reservoir_constraints = 182 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4151 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitAllLpSolution | ( | ) |
If true and the Lp relaxation of the problem has a solution, try to exploit it. This is same as above except in this case the lp solution might not be an integer solution.
optional bool exploit_all_lp_solution = 116 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8789 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitAllPrecedences | ( | ) |
optional bool exploit_all_precedences = 220 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5837 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitBestSolution | ( | ) |
When branching on a variable, follow the last best solution value.
optional bool exploit_best_solution = 130 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8818 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitIntegerLpSolution | ( | ) |
If true and the Lp relaxation of the problem has an integer optimal solution, try to exploit it. Note that since the LP relaxation may not contain all the constraints, such a solution is not necessarily a solution of the full problem.
optional bool exploit_integer_lp_solution = 94 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8757 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitObjective | ( | ) |
When branching an a variable that directly affect the objective, branch on the value that lead to the best objective first.
optional bool exploit_objective = 131 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8877 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasExploitRelaxationSolution | ( | ) |
When branching on a variable, follow the last best relaxation solution value. We use the relaxation with the tightest bound on the objective as the best relaxation solution.
optional bool exploit_relaxation_solution = 161 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8847 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpDecay | ( | ) |
On each restart, we randomly choose if we use decay (with this parameter) or no decay.
optional double feasibility_jump_decay = 242 [default = 0.95];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6602 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpEnableRestarts | ( | ) |
When stagnating, feasibility jump will either restart from a default solution (with some possible randomization), or randomly pertubate the current solution. This parameter selects the first option.
optional bool feasibility_jump_enable_restarts = 250 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6748 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpLinearizationLevel | ( | ) |
How much do we linearize the problem in the local search code.
optional int32 feasibility_jump_linearization_level = 257 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6630 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpMaxExpandedConstraintSize | ( | ) |
Maximum size of no_overlap or no_overlap_2d constraint for a quadratic expansion.
optional int32 feasibility_jump_max_expanded_constraint_size = 264 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6778 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpRestartFactor | ( | ) |
This is a factor that directly influence the work before each restart. Setting this to zero disable restart, and increasing it lead to longer restarts.
optional int32 feasibility_jump_restart_factor = 258 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6659 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpVarPerburbationRangeRatio | ( | ) |
Max distance between the default value and the pertubated value relative to the range of the domain of the variable.
optional double feasibility_jump_var_perburbation_range_ratio = 248 [default = 0.2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6718 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFeasibilityJumpVarRandomizationProbability | ( | ) |
Probability for a variable to have a non default value upon restarts or perturbations.
optional double feasibility_jump_var_randomization_probability = 247 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6689 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFillAdditionalSolutionsInResponse | ( | ) |
If true, the final response addition_solutions field will be filled with all solutions from our solutions pool. Note that if both this field and enumerate_all_solutions is true, we will copy to the pool all of the solution found. So if solution_pool_size is big enough, you can get all solutions this way instead of using the solution callback. Note that this only affect the "final" solution, not the one passed to the solution callbacks.
optional bool fill_additional_solutions_in_response = 194 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7161 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFillTightenedDomainsInResponse | ( | ) |
If true, add information about the derived variable domains to the CpSolverResponse. It is an option because it makes the response slighly bigger and there is a bit more work involved during the postsolve to construct it, but it should still have a low overhead. See the tightened_variables field in CpSolverResponse for more details.
optional bool fill_tightened_domains_in_response = 132 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7121 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFindBigLinearOverlap | ( | ) |
Try to find large "rectangle" in the linear constraint matrix with identical lines. If such rectangle is big enough, we can introduce a new integer variable corresponding to the common expression and greatly reduce the number of non-zero.
optional bool find_big_linear_overlap = 234 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4465 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFindMultipleCores | ( | ) |
Whether we try to find more independent cores for a given set of assumptions in the core based max-SAT algorithms.
optional bool find_multiple_cores = 84 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5369 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFixVariablesToTheirHintedValue | ( | ) |
If true, variables appearing in the solution hints will be fixed to their hinted value.
optional bool fix_variables_to_their_hinted_value = 192 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6143 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasFpRounding | ( | ) |
optional .operations_research.sat.SatParameters.FPRoundingMethod fp_rounding = 165 [default = PROPAGATION_ASSISTED];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7476 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasGlucoseDecayIncrement | ( | ) |
optional double glucose_decay_increment = 23 [default = 0.01];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2677 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasGlucoseDecayIncrementPeriod | ( | ) |
optional int32 glucose_decay_increment_period = 24 [default = 5000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2696 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasGlucoseMaxDecay | ( | ) |
The activity starts at 0.8 and increment by 0.01 every 5000 conflicts until 0.95. This "hack" seems to work well and comes from: Glucose 2.3 in the SAT 2013 Competition - SAT Competition 2013 http://edacc4.informatik.uni-ulm.de/SC13/solver-description-download/136
optional double glucose_max_decay = 22 [default = 0.95];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2650 of file SatParameters.java.
| int com.google.ortools.sat.SatParameters.hashCode | ( | ) |
Definition at line 12272 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasHintConflictLimit | ( | ) |
Conflict limit used in the phase that exploit the solution hint.
optional int32 hint_conflict_limit = 153 [default = 10];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6082 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasIgnoreNames | ( | ) |
If true, we don't keep names in our internal copy of the user given model.
optional bool ignore_names = 202 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4400 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInferAllDiffs | ( | ) |
Run a max-clique code amongst all the x != y we can find and try to infer set of variables that are all different. This allows to close neos16.mps for instance. Note that we only run this code if there is no all_diff already in the model so that if a user want to add some all_diff, we assume it is well done and do not try to add more.
optional bool infer_all_diffs = 233 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4431 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInitialPolarity | ( | ) |
optional .operations_research.sat.SatParameters.Polarity initial_polarity = 2 [default = POLARITY_FALSE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2051 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInitialVariablesActivity | ( | ) |
The initial value of the variables activity. A non-zero value only make sense when use_erwa_heuristic is true. Experiments with a value of 1e-2 together with the ERWA heuristic showed slighthly better result than simply using zero. The idea is that when the "learning rate" of a variable becomes lower than this value, then we prefer to branch on never explored before variables. This is not in the ERWA paper.
optional double initial_variables_activity = 76 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2254 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInprocessingDtimeRatio | ( | ) |
Proportion of deterministic time we should spend on inprocessing. At each "restart", if the proportion is below this ratio, we will do some inprocessing, otherwise, we skip it for this restart.
optional double inprocessing_dtime_ratio = 273 [default = 0.2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4526 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInprocessingMinimizationDtime | ( | ) |
Parameters for an heuristic similar to the one described in "An effective learnt clause minimization approach for CDCL Sat Solvers", https://www.ijcai.org/proceedings/2017/0098.pdf This is the amount of dtime we should spend on this technique during each inprocessing phase. The minimization technique is the same as the one used to minimize core in max-sat. We also minimize problem clauses and not just the learned clause that we keep forever like in the paper.
optional double inprocessing_minimization_dtime = 275 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4591 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInprocessingProbingDtime | ( | ) |
The amount of dtime we should spend on probing for each inprocessing round.
optional double inprocessing_probing_dtime = 274 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4555 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInstantiateAllVariables | ( | ) |
If true, the solver will add a default integer branching strategy to the already defined search strategy. If not, some variable might still not be fixed at the end of the search. For now we assume these variable can just be set to their lower bound.
optional bool instantiate_all_variables = 106 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7200 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInterleaveBatchSize | ( | ) |
optional int32 interleave_batch_size = 134 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5111 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasInterleaveSearch | ( | ) |
Experimental. If this is true, then we interleave all our major search strategy and distribute the work amongst num_workers. The search is deterministic (independently of num_workers!), and we schedule and wait for interleave_batch_size task to be completed before synchronizing and scheduling the next batch of tasks.
optional bool interleave_search = 136 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5083 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasKeepAllFeasibleSolutionsInPresolve | ( | ) |
If true, we disable the presolve reductions that remove feasible solutions from the search space. Such solution are usually dominated by a "better" solution that is kept, but depending on the situation, we might want to keep all solutions. A trivial example is when a variable is unused. If this is true, then the presolve will not fix it to an arbitrary value and it will stay in the search space.
optional bool keep_all_feasible_solutions_in_presolve = 173 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7083 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLinearizationLevel | ( | ) |
A non-negative level indicating the type of constraints we consider in the LP relaxation. At level zero, no LP relaxation is used. At level 1, only the linear constraint and full encoding are added. At level 2, we also add all the Boolean constraints.
optional int32 linearization_level = 90 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8017 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLinearSplitSize | ( | ) |
Linear constraints that are not pseudo-Boolean and that are longer than this size will be split into sqrt(size) intermediate sums in order to have faster propation in the CP engine.
optional int32 linear_split_size = 256 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7985 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLogPrefix | ( | ) |
Add a prefix to all logs.
optional string log_prefix = 185 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3513 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLogSearchProgress | ( | ) |
Whether the solver should log the search progress. This is the maing logging parameter and if this is false, none of the logging (callbacks, log_to_stdout, log_to_response, ...) will do anything.
optional bool log_search_progress = 41 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3450 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLogSubsolverStatistics | ( | ) |
Whether the solver should display per sub-solver search statistics. This is only useful is log_search_progress is set to true, and if the number of search workers is > 1. Note that in all case we display a bit of stats with one line per subsolver.
optional bool log_subsolver_statistics = 189 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3482 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLogToResponse | ( | ) |
Log to response proto.
optional bool log_to_response = 187 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3600 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLogToStdout | ( | ) |
Log to stdout.
optional bool log_to_stdout = 186 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3573 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLpDualTolerance | ( | ) |
optional double lp_dual_tolerance = 267 [default = 1e-07];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7869 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasLpPrimalTolerance | ( | ) |
The internal LP tolerances used by CP-SAT. These applies to the internal and scaled problem. If the domains of your variables are large it might be good to use lower tolerances. If your problem is binary with low coefficients, it might be good to use higher ones to speed-up the lp solves.
optional double lp_primal_tolerance = 266 [default = 1e-07];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7842 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxAllDiffCutSize | ( | ) |
Cut generator for all diffs can add too many cuts for large all_diff constraints. This parameter restricts the large all_diff constraints to have a cut generator.
optional int32 max_all_diff_cut_size = 148 [default = 64];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8388 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxClauseActivityValue | ( | ) |
optional double max_clause_activity_value = 18 [default = 1e+20];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2742 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxConsecutiveInactiveCount | ( | ) |
If a constraint/cut in LP is not active for that many consecutive OPTIMAL solves, remove it from the LP. Note that it might be added again later if it become violated by the current LP solution.
optional int32 max_consecutive_inactive_count = 121 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8619 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxCutRoundsAtLevelZero | ( | ) |
Max number of time we perform cut generation and resolve the LP at level 0.
optional int32 max_cut_rounds_at_level_zero = 154 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8590 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxDeterministicTime | ( | ) |
Maximum time allowed in deterministic time to solve a problem. The deterministic time should be correlated with the real time used by the solver, the time unit being as close as possible to a second.
optional double max_deterministic_time = 67 [default = inf];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3153 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxDomainSizeWhenEncodingEqNeqConstraints | ( | ) |
When loading a*x + b*y ==/!= c when x and y are both fully encoded. The solver may decide to replace the linear equation by a set of clauses. This is triggered if the sizes of the domains of x and y are below the threshold.
optional int32 max_domain_size_when_encoding_eq_neq_constraints = 191 [default = 16];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8079 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxIntegerRoundingScaling | ( | ) |
In the integer rounding procedure used for MIR and Gomory cut, the maximum "scaling" we use (must be positive). The lower this is, the lower the integer coefficients of the cut will be. Note that cut generated by lower values are not necessarily worse than cut generated by larger value. There is no strict dominance relationship. Setting this to 2 result in the "strong fractional rouding" of Letchford and Lodi.
optional int32 max_integer_rounding_scaling = 119 [default = 600];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8455 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxMemoryInMb | ( | ) |
Maximum memory allowed for the whole thread containing the solver. The solver will abort as soon as it detects that this limit is crossed. As a result, this limit is approximative, but usually the solver will not go too much over. TODO(user): This is only used by the pure SAT solver, generalize to CP-SAT.
optional int64 max_memory_in_mb = 40 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3226 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxNumberOfConflicts | ( | ) |
Maximum number of conflicts allowed to solve a problem. TODO(user): Maybe change the way the conflict limit is enforced? currently it is enforced on each independent internal SAT solve, rather than on the overall number of conflicts across all solves. So in the context of an optimization problem, this is not really usable directly by a client.
optional int64 max_number_of_conflicts = 37 [default = 9223372036854775807];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3188 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxNumCuts | ( | ) |
The limit on the number of cuts in our cut pool. When this is reached we do not generate cuts anymore. TODO(user): We should probably remove this parameters, and just always generate cuts but only keep the best n or something.
optional int32 max_num_cuts = 91 [default = 10000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8113 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxNumIntervalsForTimetableEdgeFinding | ( | ) |
Max number of intervals for the timetable_edge_finding algorithm to propagate. A value of 0 disables the constraint.
optional int32 max_num_intervals_for_timetable_edge_finding = 260 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5776 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxPairsPairwiseReasoningInNoOverlap2D | ( | ) |
If the number of pairs to look is below this threshold, do an extra step of propagation in the no_overlap_2d constraint by looking at all pairs of intervals.
optional int32 max_pairs_pairwise_reasoning_in_no_overlap_2d = 276 [default = 1250];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6004 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxPresolveIterations | ( | ) |
In case of large reduction in a presolve iteration, we perform multiple presolve iterations. This parameter controls the maximum number of such presolve iterations.
optional int32 max_presolve_iterations = 138 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3941 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxSatAssumptionOrder | ( | ) |
optional .operations_research.sat.SatParameters.MaxSatAssumptionOrder max_sat_assumption_order = 51 [default = DEFAULT_ASSUMPTION_ORDER];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5423 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxSatReverseAssumptionOrder | ( | ) |
If true, adds the assumption in the reverse order of the one defined by max_sat_assumption_order.
optional bool max_sat_reverse_assumption_order = 52 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5447 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxSatStratification | ( | ) |
optional .operations_research.sat.SatParameters.MaxSatStratificationAlgorithm max_sat_stratification = 53 [default = STRATIFICATION_DESCENT];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5470 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxSizeToCreatePrecedenceLiteralsInDisjunctive | ( | ) |
Create one literal for each disjunction of two pairs of tasks. This slows down the solve time, but improves the lower bound of the objective in the makespan case. This will be triggered if the number of intervals is less or equal than the parameter and if use_strong_propagation_in_disjunctive is true.
optional int32 max_size_to_create_precedence_literals_in_disjunctive = 229 [default = 60];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5583 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxTimeInSeconds | ( | ) |
Maximum time allowed in seconds to solve a problem. The counter will starts at the beginning of the Solve() call.
optional double max_time_in_seconds = 36 [default = inf];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3123 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMaxVariableActivityValue | ( | ) |
optional double max_variable_activity_value = 16 [default = 1e+100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2623 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMergeAtMostOneWorkLimit | ( | ) |
optional double merge_at_most_one_work_limit = 146 [default = 100000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4268 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMergeNoOverlapWorkLimit | ( | ) |
During presolve, we use a maximum clique heuristic to merge together no-overlap constraints or at most one constraints. This code can be slow, so we have a limit in place on the number of explored nodes in the underlying graph. The internal limit is an int64, but we use double here to simplify manual input.
optional double merge_no_overlap_work_limit = 145 [default = 1000000000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4241 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMinimizationAlgorithm | ( | ) |
optional .operations_research.sat.SatParameters.ConflictMinimizationAlgorithm minimization_algorithm = 4 [default = RECURSIVE];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2314 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMinimizeReductionDuringPbResolution | ( | ) |
A different algorithm during PB resolution. It minimizes the number of calls to ReduceCoefficients() which can be time consuming. However, the search space will be different and if the coefficients are large, this may lead to integer overflows that could otherwise be prevented.
optional bool minimize_reduction_during_pb_resolution = 48 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3663 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMinNumLnsWorkers | ( | ) |
Obsolete parameter. No-op.
optional int32 min_num_lns_workers = 211 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4699 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMinOrthogonalityForLpConstraints | ( | ) |
While adding constraints, skip the constraints which have orthogonality less than 'min_orthogonality_for_lp_constraints' with already added constraints during current call. Orthogonality is defined as 1 - cosine(vector angle between constraints). A value of zero disable this feature.
optional double min_orthogonality_for_lp_constraints = 115 [default = 0.05];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8559 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipAutomaticallyScaleVariables | ( | ) |
If true, some continuous variable might be automatically scaled. For now, this is only the case where we detect that a variable is actually an integer multiple of a constant. For instance, variables of the form k * 0.5 are quite frequent, and if we detect this, we will scale such variable domain by 2 to make it implied integer.
optional bool mip_automatically_scale_variables = 166 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9033 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipCheckPrecision | ( | ) |
As explained in mip_precision and mip_max_activity_exponent, we cannot always reach the wanted precision during scaling. We use this threshold to enphasize in the logs when the precision seems bad.
optional double mip_check_precision = 128 [default = 0.0001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9215 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipComputeTrueObjectiveBound | ( | ) |
Even if we make big error when scaling the objective, we can always derive a correct lower bound on the original objective by using the exact lower bound on the scaled integer version of the objective. This should be fast, but if you don't care about having a precise lower bound, you can turn it off.
optional bool mip_compute_true_objective_bound = 198 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9248 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipDropTolerance | ( | ) |
Any value in the input mip with a magnitude lower than this will be set to zero. This is to avoid some issue in LP presolving.
optional double mip_drop_tolerance = 232 [default = 1e-16];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9352 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipMaxActivityExponent | ( | ) |
To avoid integer overflow, we always force the maximum possible constraint activity (and objective value) according to the initial variable domain to be smaller than 2 to this given power. Because of this, we cannot always reach the "mip_wanted_precision" parameter above. This can go as high as 62, but some internal algo currently abort early if they might run into integer overflow, so it is better to keep it a bit lower than this.
optional int32 mip_max_activity_exponent = 127 [default = 53];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9179 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipMaxBound | ( | ) |
We need to bound the maximum magnitude of the variables for CP-SAT, and that is the bound we use. If the MIP model expect larger variable value in the solution, then the converted model will likely not be relevant.
optional double mip_max_bound = 124 [default = 10000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8938 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipMaxValidMagnitude | ( | ) |
Any finite values in the input MIP must be below this threshold, otherwise the model will be reported invalid. This is needed to avoid floating point overflow when evaluating bounds * coeff for instance. We are a bit more defensive, but in practice, users shouldn't use super large values in a MIP.
optional double mip_max_valid_magnitude = 199 [default = 1e+20];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9283 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipPresolveLevel | ( | ) |
When solving a MIP, we do some basic floating point presolving before scaling the problem to integer to be handled by CP-SAT. This control how much of that presolve we do. It can help to better scale floating point model, but it is not always behaving nicely.
optional int32 mip_presolve_level = 261 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9383 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipScaleLargeDomain | ( | ) |
If this is false, then mip_var_scaling is only applied to variables with "small" domain. If it is true, we scale all floating point variable independenlty of their domain.
optional bool mip_scale_large_domain = 225 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9000 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipTreatHighMagnitudeBoundsAsInfinity | ( | ) |
By default, any variable/constraint bound with a finite value and a magnitude greater than the mip_max_valid_magnitude will result with a invalid model. This flags change the behavior such that such bounds are silently transformed to +∞ or -∞. It is recommended to keep it at false, and create valid bounds.
optional bool mip_treat_high_magnitude_bounds_as_infinity = 278 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9319 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipVarScaling | ( | ) |
All continuous variable of the problem will be multiplied by this factor. By default, we don't do any variable scaling and rely on the MIP model to specify continuous variable domain with the wanted precision.
optional double mip_var_scaling = 125 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8969 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasMipWantedPrecision | ( | ) |
When scaling constraint with double coefficients to integer coefficients, we will multiply by a power of 2 and round the coefficients. We will choose the lowest power such that we have no potential overflow (see mip_max_activity_exponent) and the worst case constraint activity error does not exceed this threshold. Note that we also detect constraint with rational coefficients and scale them accordingly when it seems better instead of using a power of 2. We also relax all constraint bounds by this absolute value. For pure integer constraint, if this value if lower than one, this will not change anything. However it is needed when scaling MIP problems. If we manage to scale a constraint correctly, the maximum error we can make will be twice this value (once for the scaling error and once for the relaxed bounds). If we are not able to scale that well, we will display that fact but still scale as best as we can.
optional double mip_wanted_precision = 126 [default = 1e-06];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9129 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasName | ( | ) |
In some context, like in a portfolio of search, it makes sense to name a given parameters set for logging purpose.
optional string name = 171 [default = ""];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 1976 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNewConstraintsBatchSize | ( | ) |
Add that many lazy constraints (or cuts) at once in the LP. Note that at the beginning of the solve, we do add more than this.
optional int32 new_constraints_batch_size = 122 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8726 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNewLinearPropagation | ( | ) |
Experimental. Use new code to propagate linear constraint.
optional bool new_linear_propagation = 224 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7956 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNumConflictsBeforeStrategyChanges | ( | ) |
After each restart, if the number of conflict since the last strategy change is greater that this, then we increment a "strategy_counter" that can be use to change the search strategy used by the following restarts.
optional int32 num_conflicts_before_strategy_changes = 68 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3064 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNumSearchWorkers | ( | ) |
optional int32 num_search_workers = 100 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4676 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNumViolationLs | ( | ) |
This will create incomplete subsolvers (that are not LNS subsolvers) that use the feasibility jump code to find improving solution, treating the objective improvement as a hard constraint.
optional int32 num_violation_ls = 244 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6808 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasNumWorkers | ( | ) |
Specify the number of parallel workers (i.e. threads) to use during search. This should usually be lower than your number of available cpus + hyperthread in your machine. A value of 0 means the solver will try to use all cores on the machine. A number of 1 means no parallelism. Note that 'num_workers' is the preferred name, but if it is set to zero, we will still read the deprecated 'num_search_worker'. As of 2020-04-10, if you're using SAT via MPSolver (to solve integer programs) this field is overridden with a value of 8, if the field is not set *explicitly*. Thus, always set this field explicitly or via MPSolver::SetNumThreads().
optional int32 num_workers = 206 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4640 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasOnlyAddCutsAtLevelZero | ( | ) |
For the cut that can be generated at any level, this control if we only try to generate them at the root node.
optional bool only_add_cuts_at_level_zero = 92 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8176 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasOnlySolveIp | ( | ) |
If one try to solve a MIP model with CP-SAT, because we assume all variable to be integer after scaling, we will not necessarily have the correct optimal. Note however that all feasible solutions are valid since we will just solve a more restricted version of the original problem. This parameters is here to prevent user to think the solution is optimal when it might not be. One will need to manually set this to false to solve a MIP model where the optimal might be different. Note that this is tested after some MIP presolve steps, so even if not all original variable are integer, we might end up with a pure IP after presolve and after implied integer detection.
optional bool only_solve_ip = 222 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 9075 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasOptimizeWithCore | ( | ) |
The default optimization method is a simple "linear scan", each time trying to find a better solution than the previous one. If this is true, then we use a core-based approach (like in max-SAT) when we try to increase the lower bound instead.
optional bool optimize_with_core = 83 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6406 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasOptimizeWithLbTreeSearch | ( | ) |
Do a more conventional tree search (by opposition to SAT based one) where we keep all the explored node in a tree. This is meant to be used in a portfolio and focus on improving the objective lower bound. Keeping the whole tree allow us to report a better objective lower bound coming from the worst open node in the tree.
optional bool optimize_with_lb_tree_search = 188 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6440 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasOptimizeWithMaxHs | ( | ) |
This has no effect if optimize_with_core is false. If true, use a different core-based algorithm similar to the max-HS algo for max-SAT. This is a hybrid MIP/CP approach and it uses a MIP solver in addition to the CP/SAT one. This is also related to the PhD work of tobyodavies@ "Automatic Logic-Based Benders Decomposition with MiniZinc" http://aaai.org/ocs/index.php/AAAI/AAAI17/paper/view/14489
optional bool optimize_with_max_hs = 85 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6509 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPbCleanupIncrement | ( | ) |
Same as for the clauses, but for the learned pseudo-Boolean constraints.
optional int32 pb_cleanup_increment = 46 [default = 200];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2540 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPbCleanupRatio | ( | ) |
optional double pb_cleanup_ratio = 47 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2563 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPermutePresolveConstraintOrder | ( | ) |
optional bool permute_presolve_constraint_order = 179 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3406 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPermuteVariableRandomly | ( | ) |
This is mainly here to test the solver variability. Note that in tests, if not explicitly set to false, all 3 options will be set to true so that clients do not rely on the solver returning a specific solution if they are many equivalent optimal solutions.
optional bool permute_variable_randomly = 178 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3380 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPolarityRephaseIncrement | ( | ) |
If non-zero, then we change the polarity heuristic after that many number of conflicts in an arithmetically increasing fashion. So x the first time, 2 * x the second time, etc...
optional int32 polarity_rephase_increment = 168 [default = 1000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2123 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPolishLpSolution | ( | ) |
Whether we try to do a few degenerate iteration at the end of an LP solve to minimize the fractionality of the integer variable in the basis. This helps on some problems, but not so much on others. It also cost of bit of time to do such polish step.
optional bool polish_lp_solution = 175 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7808 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPreferredVariableOrder | ( | ) |
optional .operations_research.sat.SatParameters.VariableOrder preferred_variable_order = 1 [default = IN_ORDER];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2033 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveBlockedClause | ( | ) |
Whether we use an heuristic to detect some basic case of blocked clause in the SAT presolve.
optional bool presolve_blocked_clause = 88 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3851 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveBvaThreshold | ( | ) |
Apply Bounded Variable Addition (BVA) if the number of clauses is reduced by stricly more than this threshold. The algorithm described in the paper uses 0, but quick experiments showed that 1 is a good value. It may not be worth it to add a new variable just to remove one clause.
optional int32 presolve_bva_threshold = 73 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3909 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveBveClauseWeight | ( | ) |
During presolve, we apply BVE only if this weight times the number of clauses plus the number of clause literals is not increased.
optional int32 presolve_bve_clause_weight = 55 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3768 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveBveThreshold | ( | ) |
During presolve, only try to perform the bounded variable elimination (BVE) of a variable x if the number of occurrences of x times the number of occurrences of not(x) is not greater than this parameter.
optional int32 presolve_bve_threshold = 54 [default = 500];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3738 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveExtractIntegerEnforcement | ( | ) |
If true, we will extract from linear constraints, enforcement literals of the form "integer variable at bound => simplified constraint". This should always be beneficial except that we don't always handle them as efficiently as we could for now. This causes problem on manna81.mps (LP relaxation not as tight it seems) and on neos-3354841-apure.mps.gz (too many literals created this way).
optional bool presolve_extract_integer_enforcement = 174 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4329 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveInclusionWorkLimit | ( | ) |
A few presolve operations involve detecting constraints included in other constraint. Since there can be a quadratic number of such pairs, and processing them usually involve scanning them, the complexity of these operations can be big. This enforce a local deterministic limit on the number of entries scanned. Default is 1e8. A value of zero will disable these presolve rules completely.
optional int64 presolve_inclusion_work_limit = 201 [default = 100000000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4367 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveProbingDeterministicTimeLimit | ( | ) |
optional double presolve_probing_deterministic_time_limit = 57 [default = 30];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3827 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveSubstitutionLevel | ( | ) |
How much substitution (also called free variable aggregation in MIP litterature) should we perform at presolve. This currently only concerns variable appearing only in linear constraints. For now the value 0 turns it off and any positive value performs substitution.
optional int32 presolve_substitution_level = 147 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4294 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPresolveUseBva | ( | ) |
Whether or not we use Bounded Variable Addition (BVA) in the presolve.
optional bool presolve_use_bva = 72 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3879 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasProbingDeterministicTimeLimit | ( | ) |
The maximum "deterministic" time limit to spend in probing. A value of zero will disable the probing. TODO(user): Clean up. The first one is used in CP-SAT, the other in pure SAT presolve.
optional double probing_deterministic_time_limit = 226 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3800 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasProbingNumCombinationsLimit | ( | ) |
How many combinations of pairs or triplets of variables we want to scan.
optional int32 probing_num_combinations_limit = 272 [default = 20000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6229 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPropagationLoopDetectionFactor | ( | ) |
Some search decisions might cause a really large number of propagations to happen when integer variables with large domains are only reduced by 1 at each step. If we propagate more than the number of variable times this parameters we try to take counter-measure. Setting this to 0.0 disable this feature. TODO(user): Setting this to something like 10 helps in most cases, but the code is currently buggy and can cause the solve to enter a bad state where no progress is made.
optional double propagation_loop_detection_factor = 221 [default = 10];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5501 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPseudoCostReliabilityThreshold | ( | ) |
The solver ignores the pseudo costs of variables with number of recordings less than this threshold.
optional int64 pseudo_cost_reliability_threshold = 123 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6375 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasPushAllTasksTowardStart | ( | ) |
Experimental code: specify if the objective pushes all tasks toward the start of the schedule.
optional bool push_all_tasks_toward_start = 262 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7585 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRandomBranchesRatio | ( | ) |
A number between 0 and 1 that indicates the proportion of branching variables that are selected randomly instead of choosing the first variable from the given variable_ordering strategy.
optional double random_branches_ratio = 32 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2189 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRandomizeSearch | ( | ) |
Randomize fixed search.
optional bool randomize_search = 103 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7526 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRandomPolarityRatio | ( | ) |
The proportion of polarity chosen at random. Note that this take precedence over the phase saving heuristic. This is different from initial_polarity:POLARITY_RANDOM because it will select a new random polarity each time the variable is branched upon instead of selecting one initially and then always taking this choice.
optional double random_polarity_ratio = 45 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2156 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRandomSeed | ( | ) |
At the beginning of each solve, the random number generator used in some part of the solver is reinitialized to this seed. If you change the random seed, the solver may make different choices during the solving process. For some problems, the running time may vary a lot depending on small change in the solving algorithm. Running the solver with different seeds enables to have more robust benchmarks when evaluating new features.
optional int32 random_seed = 31 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3344 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRelativeGapLimit | ( | ) |
optional double relative_gap_limit = 160 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3315 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRepairHint | ( | ) |
If true, the solver tries to repair the solution given in the hint. This search terminates after the 'hint_conflict_limit' is reached and the solver switches to regular search. If false, then we do a FIXED_SEARCH using the hint until the hint_conflict_limit is reached.
optional bool repair_hint = 167 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6112 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRestartDlAverageRatio | ( | ) |
In the moving average restart algorithms, a restart is triggered if the window average times this ratio is greater that the global average.
optional double restart_dl_average_ratio = 63 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2946 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRestartLbdAverageRatio | ( | ) |
optional double restart_lbd_average_ratio = 71 [default = 1];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2970 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRestartPeriod | ( | ) |
Restart period for the FIXED_RESTART strategy. This is also the multiplier used by the LUBY_RESTART strategy.
optional int32 restart_period = 30 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2890 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRestartRunningWindowSize | ( | ) |
Size of the window for the moving average restarts.
optional int32 restart_running_window_size = 62 [default = 50];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2918 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasRootLpIterations | ( | ) |
Even at the root node, we do not want to spend too much time on the LP if it is "difficult". So we solve it in "chunks" of that many iterations. The solve will be continued down in the tree or the next time we go back to the root node.
optional int32 root_lp_iterations = 227 [default = 2000];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 8525 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSearchBranching | ( | ) |
optional .operations_research.sat.SatParameters.SearchBranching search_branching = 82 [default = AUTOMATIC_SEARCH];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6059 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSearchRandomVariablePoolSize | ( | ) |
Search randomization will collect the top 'search_random_variable_pool_size' valued variables, and pick one randomly. The value of the variable is specific to each strategy.
optional int64 search_random_variable_pool_size = 104 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7555 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasShareBinaryClauses | ( | ) |
Allows sharing of new learned binary clause between workers.
optional bool share_binary_clauses = 203 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5188 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSharedTreeMaxNodesPerWorker | ( | ) |
In order to limit total shared memory and communication overhead, limit the total number of nodes that may be generated in the shared tree. If the shared tree runs out of unassigned leaves, workers act as portfolio workers. Note: this limit includes interior nodes, not just leaves.
optional int32 shared_tree_max_nodes_per_worker = 238 [default = 128];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6989 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSharedTreeNumWorkers | ( | ) |
Enables experimental workstealing-like shared tree search. If non-zero, start this many complete worker threads to explore a shared search tree. These workers communicate objective bounds and simple decision nogoods relating to the shared prefix of the tree, and will avoid exploring the same subtrees as one another.
optional int32 shared_tree_num_workers = 235 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6897 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSharedTreeSplitStrategy | ( | ) |
optional .operations_research.sat.SatParameters.SharedTreeSplitStrategy shared_tree_split_strategy = 239 [default = SPLIT_STRATEGY_AUTO];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7014 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSharedTreeWorkerObjectiveSplitProbability | ( | ) |
After their assigned prefix, shared tree workers will branch on the objective with this probability. Higher numbers cause the shared tree search to focus on improving the lower bound over finding primal solutions.
optional double shared_tree_worker_objective_split_probability = 237 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6957 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasShareLevelZeroBounds | ( | ) |
Allows sharing of the bounds of modified variables at level 0.
optional bool share_level_zero_bounds = 114 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5161 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasShareObjectiveBounds | ( | ) |
Allows objective sharing between workers.
optional bool share_objective_bounds = 113 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5134 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasShavingSearchDeterministicTime | ( | ) |
Specifies the amount of deterministic time spent of each try at shaving a bound in the shaving search.
optional double shaving_search_deterministic_time = 205 [default = 0.001];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6286 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSolutionPoolSize | ( | ) |
Size of the top-n different solutions kept by the solver. This parameter must be > 0. Currently this only impact the "base" solution chosen for a LNS fragment.
optional int32 solution_pool_size = 193 [default = 3];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7367 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasStopAfterFirstSolution | ( | ) |
For an optimization problem, stop the solver as soon as we have a solution.
optional bool stop_after_first_solution = 98 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7263 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasStopAfterPresolve | ( | ) |
Mainly used when improving the presolver. When true, stops the solver after the presolve is complete (or after loading and root level propagation).
optional bool stop_after_presolve = 149 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7291 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasStopAfterRootPropagation | ( | ) |
optional bool stop_after_root_propagation = 252 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7315 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasStrategyChangeIncreaseRatio | ( | ) |
The parameter num_conflicts_before_strategy_changes is increased by that much after each strategy change.
optional double strategy_change_increase_ratio = 69 [default = 0];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3094 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSubsumptionDuringConflictAnalysis | ( | ) |
At a really low cost, during the 1-UIP conflict computation, it is easy to detect if some of the involved reasons are subsumed by the current conflict. When this is true, such clauses are detached and later removed from the problem.
optional bool subsumption_during_conflict_analysis = 56 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2358 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasSymmetryLevel | ( | ) |
Whether we try to automatically detect the symmetries in a model and exploit them. Currently, at level 1 we detect them in presolve and try to fix Booleans. At level 2, we also do some form of dynamic symmetry breaking during search.
optional int32 symmetry_level = 183 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7926 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasTableCompressionLevel | ( | ) |
How much we try to "compress" a table constraint. Compressing more leads to less Booleans and faster propagation but can reduced the quality of the lp relaxation. Values goes from 0 to 3 where we always try to fully compress a table. At 2, we try to automatically decide if it is worth it.
optional int32 table_compression_level = 217 [default = 2];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4091 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasTestFeasibilityJump | ( | ) |
Disable every other type of subsolver, setting this turns CP-SAT into a pure local-search solver.
optional bool test_feasibility_jump = 240 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6573 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseAbslRandom | ( | ) |
optional bool use_absl_random = 180 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3425 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseAreaEnergeticReasoningInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with an energetic reasoning that uses an area-based energy. This can be combined with the two other overlap heuristics above.
optional bool use_area_energetic_reasoning_in_no_overlap_2d = 271 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5973 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseBlockingRestart | ( | ) |
Block a moving restart algorithm if the trail size of the current conflict is greater than the multiplier times the moving average of the trail size at the previous conflicts.
optional bool use_blocking_restart = 64 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2995 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseCombinedNoOverlap | ( | ) |
This can be beneficial if there is a lot of no-overlap constraints but a relatively low number of different intervals in the problem. Like 1000 intervals, but 1M intervals in the no-overlap constraints covering them.
optional bool use_combined_no_overlap = 133 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7685 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseDisjunctiveConstraintInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with propagators from the disjunctive constraint to improve the inference on a set of tasks that are disjunctive at the root of the problem. This additional level supplements the default level of reasoning. Propagators of the cumulative constraint will not be used at all if all the tasks are disjunctive at root node. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_disjunctive_constraint_in_cumulative = 80 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5869 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseDualSchedulingHeuristics | ( | ) |
When set, it activates a few scheduling parameters to improve the lower bound of scheduling problems. This is only effective with multiple workers as it modifies the reduced_cost, lb_tree_search, and probing workers.
optional bool use_dual_scheduling_heuristics = 214 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6035 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseDynamicPrecedenceInCumulative | ( | ) |
optional bool use_dynamic_precedence_in_cumulative = 268 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5674 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseDynamicPrecedenceInDisjunctive | ( | ) |
Whether we try to branch on decision "interval A before interval B" rather than on intervals bounds. This usually works better, but slow down a bit the time to find the first solution. These parameters are still EXPERIMENTAL, the result should be correct, but it some corner cases, they can cause some failing CHECK in the solver.
optional bool use_dynamic_precedence_in_disjunctive = 263 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5646 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseEnergeticReasoningInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with energetic reasoning. This additional level supplements the default level of reasoning.
optional bool use_energetic_reasoning_in_no_overlap_2d = 213 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5942 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseErwaHeuristic | ( | ) |
Whether we use the ERWA (Exponential Recency Weighted Average) heuristic as described in "Learning Rate Based Branching Heuristic for SAT solvers", J.H.Liang, V. Ganesh, P. Poupart, K.Czarnecki, SAT 2016.
optional bool use_erwa_heuristic = 75 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2220 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseExactLpReason | ( | ) |
The solver usually exploit the LP relaxation of a model. If this option is true, then whatever is infered by the LP will be used like an heuristic to compute EXACT propagation on the IP. So with this option, there is no numerical imprecision issues.
optional bool use_exact_lp_reason = 109 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7653 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseExtendedProbing | ( | ) |
Use extended probing (probe bool_or, at_most_one, exactly_one).
optional bool use_extended_probing = 269 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6202 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseFeasibilityJump | ( | ) |
Parameters for an heuristic similar to the one described in the paper: "Feasibility Jump: an LP-free Lagrangian MIP heuristic", Bjørnar Luteberget, Giorgio Sartor, 2023, Mathematical Programming Computation.
optional bool use_feasibility_jump = 265 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6543 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseFeasibilityPump | ( | ) |
Adds a feasibility pump subsolver along with lns subsolvers.
optional bool use_feasibility_pump = 164 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7423 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseHardPrecedencesInCumulative | ( | ) |
If true, detect and create constraint for integer variable that are "after" a set of intervals in the same cumulative constraint. Experimental: by default we just use "direct" precedences. If exploit_all_precedences is true, we explore the full precedence graph. This assumes we have a DAG otherwise it fails.
optional bool use_hard_precedences_in_cumulative = 215 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5809 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseImpliedBounds | ( | ) |
Stores and exploits "implied-bounds" in the solver. That is, relations of the form literal => (var >= bound). This is currently used to derive stronger cuts.
optional bool use_implied_bounds = 144 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7776 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseLbRelaxLns | ( | ) |
Turns on neighborhood generator based on local branching LP. Based on Huang et al., "Local Branching Relaxation Heuristics for Integer Linear Programs", 2023.
optional bool use_lb_relax_lns = 255 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7452 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseLnsOnly | ( | ) |
LNS parameters.
optional bool use_lns_only = 101 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7338 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseObjectiveLbSearch | ( | ) |
If true, search will search in ascending max objective value (when minimizing) starting from the lower bound of the objective.
optional bool use_objective_lb_search = 228 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6315 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseObjectiveShavingSearch | ( | ) |
This search differs from the previous search as it will not use assumptions to bound the objective, and it will recreate a full model with the hardcoded objective value.
optional bool use_objective_shaving_search = 253 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6345 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseOptimizationHints | ( | ) |
For an optimization problem, whether we follow some hints in order to find a better first solution. For a variable with hint, the solver will always try to follow the hint. It will revert to the variable_branching default otherwise.
optional bool use_optimization_hints = 35 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5305 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseOptionalVariables | ( | ) |
If true, we automatically detect variables whose constraint are always enforced by the same literal and we mark them as optional. This allows to propagate them as if they were present in some situation. TODO(user): This is experimental and seems to lead to wrong optimal in some situation. It should however gives correct solutions. Fix.
optional bool use_optional_variables = 108 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7618 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseOverloadCheckerInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with overload checking, i.e., an additional level of reasoning based on energy. This additional level supplements the default level of reasoning as well as timetable edge finding. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_overload_checker_in_cumulative = 78 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5703 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUsePbResolution | ( | ) |
Whether to use pseudo-Boolean resolution to analyze a conflict. Note that this option only make sense if your problem is modelized using pseudo-Boolean constraints. If you only have clauses, this shouldn't change anything (except slow the solver down).
optional bool use_pb_resolution = 43 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 3630 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUsePhaseSaving | ( | ) |
If this is true, then the polarity of a variable will be the last value it was assigned to, or its default polarity if it was never assigned since the call to ResetDecisionHeuristic(). Actually, we use a newer version where we follow the last value in the longest non-conflicting partial assignment in the current phase. This is called 'literal phase saving'. For details see 'A Lightweight Component Caching Scheme for Satisfiability Solvers' K. Pipatsrisawat and A.Darwiche, In 10th International Conference on Theory and Applications of Satisfiability Testing, 2007.
optional bool use_phase_saving = 44 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2084 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUsePrecedencesInDisjunctiveConstraint | ( | ) |
When this is true, then a disjunctive constraint will try to use the precedence relations between time intervals to propagate their bounds further. For instance if task A and B are both before C and task A and B are in disjunction, then we can deduce that task C must start after duration(A) + duration(B) instead of simply max(duration(A), duration(B)), provided that the start time for all task was currently zero. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_precedences_in_disjunctive_constraint = 74 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5544 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseProbingSearch | ( | ) |
If true, search will continuously probe Boolean variables, and integer variable bounds. This parameter is set to true in parallel on the probing worker.
optional bool use_probing_search = 176 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6173 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseRinsLns | ( | ) |
Turns on relaxation induced neighborhood generator.
optional bool use_rins_lns = 129 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 7396 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseSatInprocessing | ( | ) |
Enable or disable "inprocessing" which is some SAT presolving done at each restart to the root level.
optional bool use_sat_inprocessing = 163 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 4496 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseSharedTreeSearch | ( | ) |
Set on shared subtree workers. Users should not set this directly.
optional bool use_shared_tree_search = 236 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6928 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseShavingInProbingSearch | ( | ) |
Add a shaving phase (where the solver tries to prove that the lower or upper bound of a variable are infeasible) to the probing search.
optional bool use_shaving_in_probing_search = 204 [default = true];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6257 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseStrongPropagationInDisjunctive | ( | ) |
Enable stronger and more expensive propagation on no_overlap constraint.
optional bool use_strong_propagation_in_disjunctive = 230 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5614 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseTimetableEdgeFindingInCumulative | ( | ) |
When this is true, the cumulative constraint is reinforced with timetable edge finding, i.e., an additional level of reasoning based on the conjunction of energy and mandatory parts. This additional level supplements the default level of reasoning as well as overload_checker. This always result in better propagation, but it is usually slow, so depending on the problem, turning this off may lead to a faster solution.
optional bool use_timetable_edge_finding_in_cumulative = 79 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5742 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasUseTimetablingInNoOverlap2D | ( | ) |
When this is true, the no_overlap_2d constraint is reinforced with propagators from the cumulative constraints. It consists of ignoring the position of rectangles in one position and projecting the no_overlap_2d on the other dimension to create a cumulative constraint. This is done on both axis. This additional level supplements the default level of reasoning.
optional bool use_timetabling_in_no_overlap_2d = 200 [default = false];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 5909 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasVariableActivityDecay | ( | ) |
Each time a conflict is found, the activities of some variables are increased by one. Then, the activity of all variables are multiplied by variable_activity_decay. To implement this efficiently, the activity of all the variables is not decayed at each conflict. Instead, the activity increment is multiplied by 1 / decay. When an activity reach max_variable_activity_value, all the activity are multiplied by 1 / max_variable_activity_value.
optional double variable_activity_decay = 15 [default = 0.8];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 2593 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasViolationLsCompoundMoveProbability | ( | ) |
Probability of using compound move search each restart. TODO(user): Add reference to paper when published.
optional double violation_ls_compound_move_probability = 259 [default = 0.5];
Implements com.google.ortools.sat.SatParametersOrBuilder.
Definition at line 6865 of file SatParameters.java.
| boolean com.google.ortools.sat.SatParameters.hasViolationLsPerturbationPeriod | ( | ) |
How long violation_ls should wait before perturbating a solution.
optional int32 violation_ls_perturbation_period = 249 [default = 100];
Implements com.google.ortools.sat.SatParametersOrBuilder.
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| final boolean com.google.ortools.sat.SatParameters.isInitialized | ( | ) |
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| Builder com.google.ortools.sat.SatParameters.newBuilderForType | ( | ) |
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| Builder com.google.ortools.sat.SatParameters.toBuilder | ( | ) |
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| void com.google.ortools.sat.SatParameters.writeTo | ( | com.google.protobuf.CodedOutputStream | output | ) | throws java.io.IOException |
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1.10.0