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