source: branches/2931_OR-Tools_LP_MIP/HeuristicLab.MathematicalOptimization/3.3/LinearProgramming/Algorithms/Solvers/ScipSolver.cs @ 16736

Last change on this file since 16736 was 16736, checked in by ddorfmei, 5 months ago

#2931: Upgraded persistence to HEAL.Attic

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Threading;
24using Google.OrTools.LinearSolver;
25using HeuristicLab.Common;
26using HeuristicLab.Core;
27using HeuristicLab.Data;
28using HeuristicLab.Optimization;
29using HeuristicLab.Parameters;
30using HEAL.Attic;
31
32namespace HeuristicLab.ExactOptimization.LinearProgramming {
33
34  [Item("SCIP", "SCIP (http://scip.zib.de/) must be installed and licensed.")]
35  [StorableType("A4185E0D-25AE-48C4-8136-A764780683D5")]
36  public class ScipSolver : ExternalIncrementalLinearSolver {
37    private TimeSpan timeLimit = TimeSpan.Zero;
38
39    public ScipSolver() {
40      Parameters.Add(libraryNameParam = new FixedValueParameter<FileValue>(nameof(LibraryName),
41        new FileValue { FileDialogFilter = FileDialogFilter, Value = Properties.Settings.Default.ScipLibraryName }));
42      problemTypeParam.Value =
43        (EnumValue<ProblemType>)new EnumValue<ProblemType>(ProblemType.MixedIntegerProgramming).AsReadOnly();
44      SolverSpecificParameters =
45        "# for file format and parameters, see https://scip.zib.de/doc/html/PARAMETERS.php" + Environment.NewLine +
46        "# examples:" + Environment.NewLine +
47        "# branching/random/seed = 10" + Environment.NewLine +
48        "# lp/initalgorithm = b # Barrier (root node of MIP)" + Environment.NewLine +
49        "# lp/resolvealgorithm = b # Barrier (MIP)" + Environment.NewLine;
50    }
51
52    [StorableConstructor]
53    protected ScipSolver(StorableConstructorFlag _) : base(_) { }
54
55    protected ScipSolver(ScipSolver original, Cloner cloner)
56      : base(original, cloner) {
57    }
58
59    protected override Solver.OptimizationProblemType OptimizationProblemType =>
60      Solver.OptimizationProblemType.ScipMixedIntegerProgramming;
61
62    protected override TimeSpan IntermediateTimeLimit => timeLimit += QualityUpdateInterval;
63
64    public override IDeepCloneable Clone(Cloner cloner) => new ScipSolver(this, cloner);
65
66    public override void Solve(ILinearProblemDefinition problemDefintion, ResultCollection results, CancellationToken cancellationToken) {
67      timeLimit = TimeSpan.Zero;
68      base.Solve(problemDefintion, results, cancellationToken);
69    }
70  }
71}
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