glpk.proto

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// Copyright 2010-2024 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
// Proto messages specific to GLPK.
syntax = "proto3";
 
package operations_research.math_opt;
 
// GLPK specific parameters for solving.
//
// Fields are optional to enable to capture user intention; if they set
// explicitly a value to then no generic solve parameters will overwrite this
// parameter. User specified solver specific parameters have priority on generic
// parameters.
message GlpkParametersProto {
  // Compute the primal or dual unbound ray when the variable (structural or
  // auxiliary) causing the unboundness is identified (see glp_get_unbnd_ray()).
  //
  // The unset value is equivalent to false.
  //
  // Rays are only available when solving linear programs, they are not
  // available for MIPs. On top of that they are only available when using a
  // simplex algorithm with the presolve disabled.
  //
  // A primal ray can only be built if the chosen LP algorithm is
  // LP_ALGORITHM_PRIMAL_SIMPLEX. Same for a dual ray and
  // LP_ALGORITHM_DUAL_SIMPLEX.
  //
  // The computation involves the basis factorization to be available which may
  // lead to extra computations/errors.
  optional bool compute_unbound_rays_if_possible = 1;
}