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.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.Operators;
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26 | using HeuristicLab.Parameters;
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27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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28 | using HeuristicLab.Selection;
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29 |
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30 | namespace HeuristicLab.Algorithms.TabuSearch {
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31 | /// <summary>
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32 | /// An operator which represents a tabu search.
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33 | /// </summary>
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34 | [Item("TabuSearchMainLoop", "An operator which represents the main loop of a tabu search.")]
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35 | [StorableClass]
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36 | public sealed class TabuSearchMainLoop : AlgorithmOperator {
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37 | #region Parameter properties
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38 | public ValueLookupParameter<IRandom> RandomParameter {
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39 | get { return (ValueLookupParameter<IRandom>)Parameters["Random"]; }
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40 | }
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41 | public ValueLookupParameter<BoolValue> MaximizationParameter {
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42 | get { return (ValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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43 | }
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44 | public LookupParameter<DoubleValue> QualityParameter {
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45 | get { return (LookupParameter<DoubleValue>)Parameters["Quality"]; }
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46 | }
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47 | public ValueLookupParameter<DoubleValue> BestKnownQualityParameter {
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48 | get { return (ValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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49 | }
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50 | public LookupParameter<DoubleValue> MoveQualityParameter {
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51 | get { return (LookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
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52 | }
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53 | public LookupParameter<BoolValue> MoveTabuParameter {
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54 | get { return (LookupParameter<BoolValue>)Parameters["MoveTabu"]; }
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55 | }
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56 | public ValueLookupParameter<IntValue> MaximumIterationsParameter {
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57 | get { return (ValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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58 | }
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59 | public ValueLookupParameter<IntValue> TabuTenureParameter {
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60 | get { return (ValueLookupParameter<IntValue>)Parameters["TabuTenure"]; }
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61 | }
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62 | public ValueLookupParameter<IOperator> MoveGeneratorParameter {
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63 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveGenerator"]; }
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64 | }
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65 | public ValueLookupParameter<IOperator> MoveEvaluatorParameter {
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66 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveEvaluator"]; }
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67 | }
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68 | public ValueLookupParameter<IOperator> MoveMakerParameter {
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69 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveMaker"]; }
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70 | }
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71 | public ValueLookupParameter<IOperator> TabuMoveEvaluatorParameter {
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72 | get { return (ValueLookupParameter<IOperator>)Parameters["TabuMoveEvaluator"]; }
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73 | }
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74 | public ValueLookupParameter<IOperator> TabuMoveMakerParameter {
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75 | get { return (ValueLookupParameter<IOperator>)Parameters["TabuMoveMaker"]; }
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76 | }
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77 | public ValueLookupParameter<IOperator> VisualizerParameter {
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78 | get { return (ValueLookupParameter<IOperator>)Parameters["Visualizer"]; }
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79 | }
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80 | public LookupParameter<IItem> VisualizationParameter {
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81 | get { return (LookupParameter<IItem>)Parameters["Visualization"]; }
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82 | }
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83 | public ValueLookupParameter<VariableCollection> ResultsParameter {
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84 | get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
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85 | }
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86 | #endregion
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87 |
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88 | [StorableConstructor]
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89 | private TabuSearchMainLoop(bool deserializing) : base() { }
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90 | public TabuSearchMainLoop()
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91 | : base() {
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92 | Initialize();
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93 | }
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94 |
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95 | private void Initialize() {
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96 | #region Create parameters
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97 | Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
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98 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
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99 | Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The value which represents the quality of a solution."));
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100 | Parameters.Add(new ValueLookupParameter<DoubleValue>("BestKnownQuality", "The best known quality value found so far."));
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101 | Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The value which represents the quality of a move."));
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102 | Parameters.Add(new LookupParameter<BoolValue>("MoveTabu", "The value that indicates if a move is tabu or not."));
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103 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
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104 | 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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105 |
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106 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
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107 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
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108 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
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109 | Parameters.Add(new ValueLookupParameter<IOperator>("TabuMoveEvaluator", "The operator that evaluates whether a move is tabu."));
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110 | Parameters.Add(new ValueLookupParameter<IOperator>("TabuMoveMaker", "The operator that declares a move tabu."));
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111 |
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112 | Parameters.Add(new ValueLookupParameter<IOperator>("Visualizer", "The operator used to visualize solutions."));
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113 | Parameters.Add(new LookupParameter<IItem>("Visualization", "The item which represents the visualization of solutions."));
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114 | Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
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115 | #endregion
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116 |
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117 | #region Create operators
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118 | TabuListCreator tabuListCreator = new TabuListCreator();
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119 | VariableCreator variableCreator = new VariableCreator();
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120 | BestQualityMemorizer bestQualityMemorizer1 = new BestQualityMemorizer();
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121 | BestQualityMemorizer bestQualityMemorizer2 = new BestQualityMemorizer();
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122 | QualityDifferenceCalculator qualityDifferenceCalculator1 = new QualityDifferenceCalculator();
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123 | Placeholder visualizer1 = new Placeholder();
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124 | ResultsCollector resultsCollector = new ResultsCollector();
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125 | UniformSubScopesProcessor mainProcessor = new UniformSubScopesProcessor();
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126 | Placeholder moveGenerator = new Placeholder();
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127 | UniformSubScopesProcessor moveEvaluationProcessor = new UniformSubScopesProcessor();
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128 | Placeholder moveEvaluator = new Placeholder();
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129 | Placeholder tabuMoveEvaluator = new Placeholder();
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130 | SubScopesSorter moveQualitySorter = new SubScopesSorter();
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131 | BestAverageWorstQualityCalculator bestAverageWorstMoveQualityCalculator = new BestAverageWorstQualityCalculator();
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132 | TabuSelector tabuSelector = new TabuSelector();
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133 | ConditionalBranch emptyNeighborhoodBranch1 = new ConditionalBranch();
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134 | RightReducer rightReducer = new RightReducer();
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135 | UniformSubScopesProcessor moveMakingProcessor = new UniformSubScopesProcessor();
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136 | Placeholder tabuMoveMaker = new Placeholder();
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137 | Placeholder moveMaker = new Placeholder();
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138 | DataTableValuesCollector valuesCollector = new DataTableValuesCollector();
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139 | SubScopesRemover subScopesRemover1 = new SubScopesRemover();
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140 | ConditionalBranch emptyNeighborhoodBranch2 = new ConditionalBranch();
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141 | UniformSubScopesProcessor removeMoves = new UniformSubScopesProcessor();
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142 | SubScopesRemover subScopesRemover2 = new SubScopesRemover();
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143 | IntCounter iterationsCounter = new IntCounter();
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144 | Comparator iterationsComparator = new Comparator();
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145 | BestQualityMemorizer bestQualityMemorizer3 = new BestQualityMemorizer();
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146 | BestQualityMemorizer bestQualityMemorizer4 = new BestQualityMemorizer();
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147 | QualityDifferenceCalculator qualityDifferenceCalculator2 = new QualityDifferenceCalculator();
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148 | Placeholder visualizer2 = new Placeholder();
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149 | ConditionalBranch iterationsTermination = new ConditionalBranch();
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150 |
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151 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0)));
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152 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("Best Move Quality", new DoubleValue(0)));
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153 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("Average Move Quality", new DoubleValue(0)));
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154 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("Worst Move Quality", new DoubleValue(0)));
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155 | variableCreator.CollectedValues.Add(new ValueParameter<DataTable>("MoveQualities", new DataTable("MoveQualities")));
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156 | variableCreator.CollectedValues.Add(new ValueParameter<BoolValue>("EmptyNeighborhood", new BoolValue(false)));
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157 |
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158 | bestQualityMemorizer1.BestQualityParameter.ActualName = "BestQuality";
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159 | bestQualityMemorizer1.MaximizationParameter.ActualName = MaximizationParameter.Name;
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160 | bestQualityMemorizer1.QualityParameter.ActualName = QualityParameter.Name;
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161 |
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162 | bestQualityMemorizer2.BestQualityParameter.ActualName = BestKnownQualityParameter.Name;
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163 | bestQualityMemorizer2.MaximizationParameter.ActualName = MaximizationParameter.Name;
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164 | bestQualityMemorizer2.QualityParameter.ActualName = QualityParameter.Name;
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165 |
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166 | qualityDifferenceCalculator1.AbsoluteDifferenceParameter.ActualName = "AbsoluteDifferenceBestKnownToBest";
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167 | qualityDifferenceCalculator1.FirstQualityParameter.ActualName = BestKnownQualityParameter.Name;
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168 | qualityDifferenceCalculator1.RelativeDifferenceParameter.ActualName = "RelativeDifferenceBestKnownToBest";
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169 | qualityDifferenceCalculator1.SecondQualityParameter.ActualName = "BestQuality";
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170 |
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171 | visualizer1.Name = "Visualizer (placeholder)";
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172 | visualizer1.OperatorParameter.ActualName = VisualizerParameter.Name;
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173 |
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174 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>("Iterations"));
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175 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Quality", null, "BestQuality"));
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176 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Move Quality"));
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177 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Average Move Quality"));
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178 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Worst Move Quality"));
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179 | resultsCollector.CollectedValues.Add(new LookupParameter<DataTable>("MoveQualities"));
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180 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Known Quality", null, BestKnownQualityParameter.Name));
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181 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Absolute Difference of Best Known Quality to Best Quality", null, "AbsoluteDifferenceBestKnownToBest"));
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182 | resultsCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Relative Difference of Best Known Quality to Best Quality", null, "RelativeDifferenceBestKnownToBest"));
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183 | resultsCollector.CollectedValues.Add(new LookupParameter<IItem>("Solution Visualization", null, VisualizationParameter.Name));
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184 | resultsCollector.ResultsParameter.ActualName = "Results";
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185 |
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186 | mainProcessor.Name = "Solution processor (UniformSubScopesProcessor)";
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187 |
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188 | moveGenerator.Name = "MoveGenerator (placeholder)";
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189 | moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
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190 |
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191 | moveEvaluator.Name = "MoveEvaluator (placeholder)";
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192 | moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
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193 |
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194 | tabuMoveEvaluator.Name = "TabuMoveEvaluator (placeholder)";
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195 | tabuMoveEvaluator.OperatorParameter.ActualName = TabuMoveEvaluatorParameter.Name;
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196 |
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197 | moveQualitySorter.DescendingParameter.ActualName = MaximizationParameter.Name;
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198 | moveQualitySorter.ValueParameter.ActualName = MoveQualityParameter.Name;
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199 |
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200 | bestAverageWorstMoveQualityCalculator.AverageQualityParameter.ActualName = "Average Move Quality";
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201 | bestAverageWorstMoveQualityCalculator.BestQualityParameter.ActualName = "Best Move Quality";
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202 | bestAverageWorstMoveQualityCalculator.MaximizationParameter.ActualName = "Maximization";
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203 | bestAverageWorstMoveQualityCalculator.QualityParameter.ActualName = MoveQualityParameter.Name;
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204 | bestAverageWorstMoveQualityCalculator.WorstQualityParameter.ActualName = "Worst Move Quality";
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205 |
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206 | valuesCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Move Quality"));
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207 | valuesCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Average Move Quality"));
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208 | valuesCollector.CollectedValues.Add(new LookupParameter<DoubleValue>("Worst Move Quality"));
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209 | valuesCollector.DataTableParameter.ActualName = "MoveQualities";
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210 |
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211 | moveMakingProcessor.Name = "MoveMaking processor (UniformSubScopesProcessor)";
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212 |
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213 | emptyNeighborhoodBranch1.Name = "Neighborhood empty?";
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214 | emptyNeighborhoodBranch1.ConditionParameter.ActualName = "EmptyNeighborhood";
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215 |
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216 | tabuMoveMaker.Name = "TabuMoveMaker (placeholder)";
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217 | tabuMoveMaker.OperatorParameter.ActualName = TabuMoveMakerParameter.Name;
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218 |
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219 | moveMaker.Name = "MoveMaker (placeholder)";
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220 | moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
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221 |
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222 | subScopesRemover1.RemoveAllSubScopes = true;
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223 |
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224 | emptyNeighborhoodBranch2.Name = "Neighborhood empty?";
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225 | emptyNeighborhoodBranch2.ConditionParameter.ActualName = "EmptyNeighborhood";
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226 |
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227 | subScopesRemover2.RemoveAllSubScopes = true;
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228 |
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229 | iterationsCounter.Name = "Iterations Counter";
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230 | iterationsCounter.Increment = new IntValue(1);
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231 | iterationsCounter.ValueParameter.ActualName = "Iterations";
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232 |
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233 | iterationsComparator.Name = "Iterations >= MaximumIterations";
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234 | iterationsComparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
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235 | iterationsComparator.LeftSideParameter.ActualName = "Iterations";
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236 | iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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237 | iterationsComparator.ResultParameter.ActualName = "Terminate";
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238 |
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239 | bestQualityMemorizer3.BestQualityParameter.ActualName = "BestQuality";
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240 | bestQualityMemorizer3.MaximizationParameter.ActualName = MaximizationParameter.Name;
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241 | bestQualityMemorizer3.QualityParameter.ActualName = QualityParameter.Name;
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242 |
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243 | bestQualityMemorizer4.BestQualityParameter.ActualName = BestKnownQualityParameter.Name;
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244 | bestQualityMemorizer4.MaximizationParameter.ActualName = MaximizationParameter.Name;
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245 | bestQualityMemorizer4.QualityParameter.ActualName = QualityParameter.Name;
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246 |
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247 | qualityDifferenceCalculator2.AbsoluteDifferenceParameter.ActualName = "AbsoluteDifferenceBestKnownToBest";
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248 | qualityDifferenceCalculator2.FirstQualityParameter.ActualName = BestKnownQualityParameter.Name;
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249 | qualityDifferenceCalculator2.RelativeDifferenceParameter.ActualName = "RelativeDifferenceBestKnownToBest";
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250 | qualityDifferenceCalculator2.SecondQualityParameter.ActualName = "BestQuality";
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251 |
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252 | visualizer2.Name = "Visualizer (placeholder)";
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253 | visualizer2.OperatorParameter.ActualName = VisualizerParameter.Name;
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254 |
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255 | iterationsTermination.Name = "Iterations Termination Condition";
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256 | iterationsTermination.ConditionParameter.ActualName = "Terminate";
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257 | #endregion
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258 |
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259 | #region Create operator graph
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260 | OperatorGraph.InitialOperator = tabuListCreator;
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261 | tabuListCreator.Successor = variableCreator;
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262 | variableCreator.Successor = bestQualityMemorizer1;
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263 | bestQualityMemorizer1.Successor = bestQualityMemorizer2;
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264 | bestQualityMemorizer2.Successor = qualityDifferenceCalculator1;
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265 | qualityDifferenceCalculator1.Successor = visualizer1;
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266 | visualizer1.Successor = resultsCollector;
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267 | resultsCollector.Successor = mainProcessor;
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268 | mainProcessor.Operator = moveGenerator;
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269 | mainProcessor.Successor = emptyNeighborhoodBranch2;
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270 | moveGenerator.Successor = moveEvaluationProcessor;
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271 | moveEvaluationProcessor.Operator = moveEvaluator;
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272 | moveEvaluationProcessor.Successor = moveQualitySorter;
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273 | moveEvaluator.Successor = tabuMoveEvaluator;
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274 | tabuMoveEvaluator.Successor = null;
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275 | moveQualitySorter.Successor = bestAverageWorstMoveQualityCalculator;
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276 | bestAverageWorstMoveQualityCalculator.Successor = valuesCollector;
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277 | valuesCollector.Successor = tabuSelector;
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278 | tabuSelector.Successor = emptyNeighborhoodBranch1;
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279 | emptyNeighborhoodBranch1.FalseBranch = rightReducer;
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280 | emptyNeighborhoodBranch1.TrueBranch = null;
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281 | emptyNeighborhoodBranch1.Successor = null;
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282 | rightReducer.Successor = moveMakingProcessor;
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283 | moveMakingProcessor.Operator = tabuMoveMaker;
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284 | moveMakingProcessor.Successor = subScopesRemover1;
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285 | tabuMoveMaker.Successor = moveMaker;
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286 | moveMaker.Successor = null;
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287 | subScopesRemover1.Successor = null;
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288 | emptyNeighborhoodBranch2.FalseBranch = iterationsCounter;
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289 | emptyNeighborhoodBranch2.TrueBranch = removeMoves;
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290 | emptyNeighborhoodBranch2.Successor = null;
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291 | removeMoves.Operator = subScopesRemover2;
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292 | removeMoves.Successor = null;
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293 | subScopesRemover2.Successor = null;
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294 | iterationsCounter.Successor = iterationsComparator;
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295 | iterationsComparator.Successor = bestQualityMemorizer3;
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296 | bestQualityMemorizer3.Successor = bestQualityMemorizer4;
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297 | bestQualityMemorizer4.Successor = qualityDifferenceCalculator2;
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298 | qualityDifferenceCalculator2.Successor = visualizer2;
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299 | visualizer2.Successor = iterationsTermination;
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300 | iterationsTermination.TrueBranch = null;
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301 | iterationsTermination.FalseBranch = mainProcessor;
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302 | #endregion
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303 | }
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304 | }
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305 | }
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