| 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 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 HeuristicLab.Analysis;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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| 26 | using HeuristicLab.Operators;
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| 27 | using HeuristicLab.Optimization.Operators;
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| 28 | using HeuristicLab.Parameters;
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| 29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 30 | using HeuristicLab.Selection;
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| 31 |
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| 32 | namespace HeuristicLab.Algorithms.TabuSearch {
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| 33 | /// <summary>
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| 34 | /// An operator which represents a tabu search.
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| 35 | /// </summary>
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| 36 | [Item("TabuSearchMainLoop", "An operator which represents the main loop of a tabu search.")]
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| 37 | [StorableClass]
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| 38 | public sealed class TabuSearchMainLoop : AlgorithmOperator {
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| 39 | #region Parameter properties
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| 40 | public ValueLookupParameter<IRandom> RandomParameter {
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| 41 | get { return (ValueLookupParameter<IRandom>)Parameters["Random"]; }
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| 42 | }
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| 43 | public ValueLookupParameter<BoolValue> MaximizationParameter {
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| 44 | get { return (ValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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| 45 | }
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| 46 | public LookupParameter<DoubleValue> QualityParameter {
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| 47 | get { return (LookupParameter<DoubleValue>)Parameters["Quality"]; }
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| 48 | }
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| 49 | public ValueLookupParameter<DoubleValue> BestKnownQualityParameter {
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| 50 | get { return (ValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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| 51 | }
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| 52 | public LookupParameter<DoubleValue> MoveQualityParameter {
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| 53 | get { return (LookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
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| 54 | }
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| 55 | public LookupParameter<BoolValue> MoveTabuParameter {
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| 56 | get { return (LookupParameter<BoolValue>)Parameters["MoveTabu"]; }
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| 57 | }
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| 58 | public ValueLookupParameter<IntValue> MaximumIterationsParameter {
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| 59 | get { return (ValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 60 | }
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| 61 | public ValueLookupParameter<IntValue> TabuTenureParameter {
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| 62 | get { return (ValueLookupParameter<IntValue>)Parameters["TabuTenure"]; }
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| 63 | }
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| 64 | public ValueLookupParameter<IOperator> MoveGeneratorParameter {
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| 65 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveGenerator"]; }
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| 66 | }
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| 67 | public ValueLookupParameter<IOperator> MoveEvaluatorParameter {
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| 68 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveEvaluator"]; }
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| 69 | }
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| 70 | public ValueLookupParameter<IOperator> MoveMakerParameter {
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| 71 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveMaker"]; }
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| 72 | }
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| 73 | public ValueLookupParameter<IOperator> TabuCheckerParameter {
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| 74 | get { return (ValueLookupParameter<IOperator>)Parameters["TabuChecker"]; }
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| 75 | }
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| 76 | public ValueLookupParameter<IOperator> TabuMakerParameter {
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| 77 | get { return (ValueLookupParameter<IOperator>)Parameters["TabuMaker"]; }
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| 78 | }
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| 79 | public ValueLookupParameter<IOperator> AnalyzerParameter {
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| 80 | get { return (ValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
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| 81 | }
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| 82 | public ValueLookupParameter<VariableCollection> ResultsParameter {
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| 83 | get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
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| 84 | }
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| 85 | #endregion
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| 86 |
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| 87 | [StorableConstructor]
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| 88 | private TabuSearchMainLoop(bool deserializing) : base() { }
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| 89 | public TabuSearchMainLoop()
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| 90 | : base() {
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| 91 | Initialize();
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| 92 | }
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| 93 |
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| 94 | private void Initialize() {
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| 95 | #region Create parameters
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| 96 | Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
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| 97 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
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| 98 | Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The value which represents the quality of a solution."));
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| 99 | Parameters.Add(new ValueLookupParameter<DoubleValue>("BestKnownQuality", "The best known quality value found so far."));
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| 100 | Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The value which represents the quality of a move."));
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| 101 | Parameters.Add(new LookupParameter<BoolValue>("MoveTabu", "The value that indicates if a move is tabu or not."));
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| 102 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
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| 103 | Parameters.Add(new ValueLookupParameter<IntValue>("TabuTenure", "The length of the tabu list, and also means the number of iterations a move is kept tabu"));
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| 104 |
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| 105 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
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| 106 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
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| 107 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
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| 108 | Parameters.Add(new ValueLookupParameter<IOperator>("TabuChecker", "The operator that checks whether a move is tabu."));
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| 109 | Parameters.Add(new ValueLookupParameter<IOperator>("TabuMaker", "The operator that declares a move tabu."));
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| 110 |
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| 111 | Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze the solution and moves."));
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| 112 | Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
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| 113 | #endregion
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| 114 |
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| 115 | #region Create operators
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| 116 | VariableCreator variableCreator = new VariableCreator();
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| 117 | SubScopesProcessor subScopesProcessor0 = new SubScopesProcessor();
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| 118 | Assigner bestQualityInitializer = new Assigner();
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| 119 | Placeholder analyzer1 = new Placeholder();
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| 120 | ResultsCollector resultsCollector1 = new ResultsCollector();
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| 121 | ResultsCollector resultsCollector2 = new ResultsCollector();
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| 122 | SubScopesProcessor solutionProcessor = new SubScopesProcessor();
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| 123 | Placeholder moveGenerator = new Placeholder();
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| 124 | UniformSubScopesProcessor moveEvaluationProcessor = new UniformSubScopesProcessor();
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| 125 | Placeholder moveEvaluator = new Placeholder();
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| 126 | IntCounter evaluatedMovesCounter = new IntCounter();
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| 127 | Placeholder tabuChecker = new Placeholder();
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| 128 | SubScopesSorter moveQualitySorter = new SubScopesSorter();
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| 129 | TabuSelector tabuSelector = new TabuSelector();
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| 130 | ConditionalBranch emptyNeighborhoodBranch1 = new ConditionalBranch();
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| 131 | SubScopesProcessor moveMakingProcessor = new SubScopesProcessor();
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| 132 | UniformSubScopesProcessor selectedMoveMakingProcesor = new UniformSubScopesProcessor();
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| 133 | Placeholder tabuMaker = new Placeholder();
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| 134 | Placeholder moveMaker = new Placeholder();
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| 135 | MergingReducer mergingReducer = new MergingReducer();
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| 136 | Placeholder analyzer2 = new Placeholder();
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| 137 | SubScopesRemover subScopesRemover = new SubScopesRemover();
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| 138 | ConditionalBranch emptyNeighborhoodBranch2 = new ConditionalBranch();
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| 139 | BestQualityMemorizer bestQualityUpdater = new BestQualityMemorizer();
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| 140 | IntCounter iterationsCounter = new IntCounter();
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| 141 | Comparator iterationsComparator = new Comparator();
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| 142 | ResultsCollector resultsCollector3 = new ResultsCollector();
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| 143 | ConditionalBranch iterationsTermination = new ConditionalBranch();
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| 144 |
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| 145 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0))); // Class TabuSearch expects this to be called Iterations
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| 146 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("EvaluatedMoves", new IntValue(0)));
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| 147 | variableCreator.CollectedValues.Add(new ValueParameter<BoolValue>("EmptyNeighborhood", new BoolValue(false)));
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| 148 | variableCreator.CollectedValues.Add(new ValueParameter<ItemList<IItem>>("TabuList", new ItemList<IItem>()));
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| 149 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("BestQuality", new DoubleValue(0)));
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| 150 |
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| 151 | bestQualityInitializer.Name = "Initialize BestQuality";
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| 152 | bestQualityInitializer.LeftSideParameter.ActualName = "BestQuality";
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| 153 | bestQualityInitializer.RightSideParameter.ActualName = QualityParameter.Name;
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| 154 |
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| 155 | analyzer1.Name = "Analyzer (placeholder)";
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| 156 | analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
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| 157 |
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| 158 | resultsCollector1.CopyValue = new BoolValue(false);
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| 159 | resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>("Iterations"));
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| 160 | resultsCollector1.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Quality", null, "BestQuality"));
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| 161 | resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;
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| 162 |
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| 163 | resultsCollector2.CopyValue = new BoolValue(true);
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| 164 | resultsCollector2.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Moves", null, "EvaluatedMoves"));
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| 165 | resultsCollector2.ResultsParameter.ActualName = ResultsParameter.Name;
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| 166 |
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| 167 | moveGenerator.Name = "MoveGenerator (placeholder)";
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| 168 | moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
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| 169 |
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| 170 | moveEvaluator.Name = "MoveEvaluator (placeholder)";
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| 171 | moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 172 |
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| 173 | evaluatedMovesCounter.Name = "EvaluatedMoves + 1";
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| 174 | evaluatedMovesCounter.ValueParameter.ActualName = "EvaluatedMoves";
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| 175 | evaluatedMovesCounter.Increment = new IntValue(1);
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| 176 |
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| 177 | tabuChecker.Name = "TabuChecker (placeholder)";
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| 178 | tabuChecker.OperatorParameter.ActualName = TabuCheckerParameter.Name;
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| 179 |
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| 180 | moveQualitySorter.DescendingParameter.ActualName = MaximizationParameter.Name;
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| 181 | moveQualitySorter.ValueParameter.ActualName = MoveQualityParameter.Name;
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| 182 |
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| 183 | tabuSelector.AspirationParameter.Value = new BoolValue(true);
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| 184 | tabuSelector.BestQualityParameter.ActualName = "BestQuality";
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| 185 | tabuSelector.CopySelected = new BoolValue(false);
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| 186 | tabuSelector.EmptyNeighborhoodParameter.ActualName = "EmptyNeighborhood";
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| 187 | tabuSelector.MaximizationParameter.ActualName = MaximizationParameter.Name;
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| 188 | tabuSelector.MoveQualityParameter.ActualName = MoveQualityParameter.Name;
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| 189 | tabuSelector.MoveTabuParameter.ActualName = MoveTabuParameter.Name;
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| 190 |
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| 191 | moveMakingProcessor.Name = "MoveMaking processor (UniformSubScopesProcessor)";
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| 192 |
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| 193 | emptyNeighborhoodBranch1.Name = "Neighborhood empty?";
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| 194 | emptyNeighborhoodBranch1.ConditionParameter.ActualName = "EmptyNeighborhood";
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| 195 |
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| 196 | tabuMaker.Name = "TabuMaker (placeholder)";
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| 197 | tabuMaker.OperatorParameter.ActualName = TabuMakerParameter.Name;
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| 198 |
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| 199 | moveMaker.Name = "MoveMaker (placeholder)";
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| 200 | moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
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| 201 |
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| 202 | analyzer2.Name = "Analyzer (placeholder)";
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| 203 | analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
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| 204 |
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| 205 | subScopesRemover.RemoveAllSubScopes = true;
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| 206 |
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| 207 | bestQualityUpdater.Name = "Update BestQuality";
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| 208 | bestQualityUpdater.MaximizationParameter.ActualName = MaximizationParameter.Name;
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| 209 | bestQualityUpdater.QualityParameter.ActualName = QualityParameter.Name;
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| 210 | bestQualityUpdater.BestQualityParameter.ActualName = "BestQuality";
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| 211 |
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| 212 | iterationsCounter.Name = "Iterations Counter";
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| 213 | iterationsCounter.Increment = new IntValue(1);
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| 214 | iterationsCounter.ValueParameter.ActualName = "Iterations";
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| 215 |
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| 216 | iterationsComparator.Name = "Iterations >= MaximumIterations";
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| 217 | iterationsComparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
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| 218 | iterationsComparator.LeftSideParameter.ActualName = "Iterations";
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| 219 | iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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| 220 | iterationsComparator.ResultParameter.ActualName = "Terminate";
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| 221 |
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| 222 | resultsCollector3.CopyValue = new BoolValue(true);
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| 223 | resultsCollector3.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Moves", null, "EvaluatedMoves"));
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| 224 | resultsCollector3.ResultsParameter.ActualName = ResultsParameter.Name;
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| 225 |
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| 226 | emptyNeighborhoodBranch2.Name = "Neighborhood empty?";
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| 227 | emptyNeighborhoodBranch2.ConditionParameter.ActualName = "EmptyNeighborhood";
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| 228 |
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| 229 | iterationsTermination.Name = "Iterations Termination Condition";
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| 230 | iterationsTermination.ConditionParameter.ActualName = "Terminate";
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| 231 | #endregion
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| 232 |
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| 233 | #region Create operator graph
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| 234 | OperatorGraph.InitialOperator = variableCreator;
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| 235 | variableCreator.Successor = subScopesProcessor0;
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| 236 | subScopesProcessor0.Operators.Add(bestQualityInitializer);
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| 237 | subScopesProcessor0.Successor = resultsCollector1;
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| 238 | bestQualityInitializer.Successor = analyzer1;
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| 239 | analyzer1.Successor = null;
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| 240 | resultsCollector1.Successor = resultsCollector2;
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| 241 | resultsCollector2.Successor = solutionProcessor;
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| 242 | solutionProcessor.Operators.Add(moveGenerator);
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| 243 | solutionProcessor.Successor = iterationsCounter;
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| 244 | moveGenerator.Successor = moveEvaluationProcessor;
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| 245 | moveEvaluationProcessor.Operator = moveEvaluator;
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| 246 | moveEvaluationProcessor.Successor = moveQualitySorter;
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| 247 | moveEvaluator.Successor = evaluatedMovesCounter;
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| 248 | evaluatedMovesCounter.Successor = tabuChecker;
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| 249 | tabuChecker.Successor = null;
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| 250 | moveQualitySorter.Successor = tabuSelector;
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| 251 | tabuSelector.Successor = emptyNeighborhoodBranch1;
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| 252 | emptyNeighborhoodBranch1.FalseBranch = moveMakingProcessor;
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| 253 | emptyNeighborhoodBranch1.TrueBranch = null;
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| 254 | emptyNeighborhoodBranch1.Successor = subScopesRemover;
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| 255 | moveMakingProcessor.Operators.Add(new EmptyOperator());
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| 256 | moveMakingProcessor.Operators.Add(selectedMoveMakingProcesor);
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| 257 | moveMakingProcessor.Successor = mergingReducer;
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| 258 | selectedMoveMakingProcesor.Operator = tabuMaker;
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| 259 | selectedMoveMakingProcesor.Successor = null;
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| 260 | tabuMaker.Successor = moveMaker;
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| 261 | moveMaker.Successor = null;
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| 262 | mergingReducer.Successor = analyzer2;
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| 263 | analyzer2.Successor = null;
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| 264 | subScopesRemover.Successor = null;
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| 265 | iterationsCounter.Successor = iterationsComparator;
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| 266 | iterationsComparator.Successor = resultsCollector3;
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| 267 | resultsCollector3.Successor = emptyNeighborhoodBranch2;
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| 268 | emptyNeighborhoodBranch2.TrueBranch = null;
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| 269 | emptyNeighborhoodBranch2.FalseBranch = iterationsTermination;
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| 270 | emptyNeighborhoodBranch2.Successor = null;
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| 271 | iterationsTermination.TrueBranch = null;
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| 272 | iterationsTermination.FalseBranch = solutionProcessor;
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| 273 | #endregion
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| 274 | }
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| 275 |
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| 276 | public override IOperation Apply() {
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| 277 | if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null
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| 278 | || TabuCheckerParameter.ActualValue == null || TabuMakerParameter.ActualValue == null)
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| 279 | return null;
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| 280 | return base.Apply();
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| 281 | }
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| 282 | }
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| 283 | }
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