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.Common;
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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.Optimization.Operators;
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27 | using HeuristicLab.Parameters;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 | using HeuristicLab.Selection;
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30 |
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31 | namespace HeuristicLab.Algorithms.LocalSearch {
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32 | /// <summary>
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33 | /// An operator which represents a local search.
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34 | /// </summary>
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35 | [Item("LocalSearchMainLoop", "An operator which represents the main loop of a best improvement local search (if only a single move is generated in each iteration it is a first improvement local search).")]
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36 | [StorableClass]
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37 | public sealed class LocalSearchMainLoop : AlgorithmOperator {
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38 | #region Parameter properties
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39 | public ValueLookupParameter<IRandom> RandomParameter {
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40 | get { return (ValueLookupParameter<IRandom>)Parameters["Random"]; }
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41 | }
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42 | public ValueLookupParameter<BoolValue> MaximizationParameter {
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43 | get { return (ValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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44 | }
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45 | public LookupParameter<DoubleValue> QualityParameter {
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46 | get { return (LookupParameter<DoubleValue>)Parameters["Quality"]; }
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47 | }
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48 | public ValueLookupParameter<DoubleValue> BestKnownQualityParameter {
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49 | get { return (ValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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50 | }
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51 | public LookupParameter<DoubleValue> MoveQualityParameter {
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52 | get { return (LookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
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53 | }
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54 | public ValueLookupParameter<IntValue> MaximumIterationsParameter {
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55 | get { return (ValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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56 | }
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57 | public ValueLookupParameter<VariableCollection> ResultsParameter {
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58 | get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
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59 | }
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60 | public ValueLookupParameter<IOperator> MoveGeneratorParameter {
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61 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveGenerator"]; }
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62 | }
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63 | public ValueLookupParameter<IOperator> MoveEvaluatorParameter {
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64 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveEvaluator"]; }
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65 | }
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66 | public ValueLookupParameter<IOperator> MoveMakerParameter {
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67 | get { return (ValueLookupParameter<IOperator>)Parameters["MoveMaker"]; }
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68 | }
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69 | public ValueLookupParameter<IOperator> AnalyzerParameter {
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70 | get { return (ValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
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71 | }
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72 |
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73 | private ScopeParameter CurrentScopeParameter {
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74 | get { return (ScopeParameter)Parameters["CurrentScope"]; }
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75 | }
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76 | public IScope CurrentScope {
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77 | get { return CurrentScopeParameter.ActualValue; }
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78 | }
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79 | #endregion
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80 |
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81 | [StorableConstructor]
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82 | private LocalSearchMainLoop(bool deserializing) : base(deserializing) { }
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83 | public LocalSearchMainLoop()
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84 | : base() {
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85 | Initialize();
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86 | }
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87 | private LocalSearchMainLoop(LocalSearchMainLoop original, Cloner cloner)
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88 | : base(original, cloner) {
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89 | }
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90 | public override IDeepCloneable Clone(Cloner cloner) {
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91 | return new LocalSearchMainLoop(this, cloner);
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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 ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
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102 | Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
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103 |
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104 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
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105 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
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106 | Parameters.Add(new ValueLookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
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107 |
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108 | Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze the solution and moves."));
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109 | Parameters.Add(new ScopeParameter("CurrentScope", "The current scope which represents a population of solutions on which the TS should be applied."));
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110 | #endregion
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111 |
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112 | #region Create operators
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113 | VariableCreator variableCreator = new VariableCreator();
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114 | SubScopesProcessor subScopesProcessor0 = new SubScopesProcessor();
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115 | Assigner bestQualityInitializer = new Assigner();
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116 | Placeholder analyzer1 = new Placeholder();
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117 | ResultsCollector resultsCollector1 = new ResultsCollector();
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118 | ResultsCollector resultsCollector2 = new ResultsCollector();
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119 | SubScopesProcessor mainProcessor = new SubScopesProcessor();
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120 | Placeholder moveGenerator = new Placeholder();
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121 | UniformSubScopesProcessor moveEvaluationProcessor = new UniformSubScopesProcessor();
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122 | Placeholder moveEvaluator = new Placeholder();
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123 | IntCounter evaluatedMovesCounter = new IntCounter();
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124 | BestSelector bestSelector = new BestSelector();
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125 | SubScopesProcessor moveMakingProcessor = new SubScopesProcessor();
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126 | UniformSubScopesProcessor selectedMoveMakingProcessor = new UniformSubScopesProcessor();
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127 | QualityComparator qualityComparator = new QualityComparator();
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128 | ConditionalBranch improvesQualityBranch = new ConditionalBranch();
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129 | Placeholder moveMaker = new Placeholder();
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130 | Assigner bestQualityUpdater = new Assigner();
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131 | MergingReducer mergingReducer = new MergingReducer();
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132 | Placeholder analyzer2 = new Placeholder();
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133 | SubScopesRemover subScopesRemover = new SubScopesRemover();
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134 | IntCounter iterationsCounter = new IntCounter();
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135 | Comparator iterationsComparator = new Comparator();
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136 | ResultsCollector resultsCollector3 = new ResultsCollector();
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137 | ConditionalBranch iterationsTermination = new ConditionalBranch();
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138 |
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139 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0))); // Class LocalSearch expects this to be called Iterations
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140 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("BestQuality", new DoubleValue(0)));
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141 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("EvaluatedMoves", new IntValue(0)));
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142 |
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143 | bestQualityInitializer.Name = "Initialize BestQuality";
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144 | bestQualityInitializer.LeftSideParameter.ActualName = "BestQuality";
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145 | bestQualityInitializer.RightSideParameter.ActualName = QualityParameter.Name;
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146 |
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147 | analyzer1.Name = "Analyzer (placeholder)";
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148 | analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
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149 |
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150 | resultsCollector1.CopyValue = new BoolValue(false);
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151 | resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>("Iterations"));
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152 | resultsCollector1.CollectedValues.Add(new LookupParameter<DoubleValue>("Best Quality", null, "BestQuality"));
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153 | resultsCollector1.ResultsParameter.ActualName = ResultsParameter.Name;
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154 |
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155 | resultsCollector2.CopyValue = new BoolValue(true);
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156 | resultsCollector2.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Moves", null, "EvaluatedMoves"));
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157 | resultsCollector2.ResultsParameter.ActualName = ResultsParameter.Name;
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158 |
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159 | moveGenerator.Name = "MoveGenerator (placeholder)";
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160 | moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
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161 |
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162 | moveEvaluator.Name = "MoveEvaluator (placeholder)";
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163 | moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
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164 |
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165 | evaluatedMovesCounter.Name = "EvaluatedMoves + 1";
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166 | evaluatedMovesCounter.ValueParameter.ActualName = "EvaluatedMoves";
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167 | evaluatedMovesCounter.Increment = new IntValue(1);
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168 |
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169 | bestSelector.CopySelected = new BoolValue(false);
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170 | bestSelector.MaximizationParameter.ActualName = MaximizationParameter.Name;
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171 | bestSelector.NumberOfSelectedSubScopesParameter.Value = new IntValue(1);
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172 | bestSelector.QualityParameter.ActualName = MoveQualityParameter.Name;
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173 |
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174 | qualityComparator.LeftSideParameter.ActualName = MoveQualityParameter.Name;
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175 | qualityComparator.RightSideParameter.ActualName = QualityParameter.Name;
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176 | qualityComparator.ResultParameter.ActualName = "IsBetter";
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177 |
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178 | improvesQualityBranch.ConditionParameter.ActualName = "IsBetter";
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179 |
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180 | moveMaker.Name = "MoveMaker (placeholder)";
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181 | moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
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182 |
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183 | bestQualityUpdater.Name = "Update BestQuality";
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184 | bestQualityUpdater.LeftSideParameter.ActualName = "BestQuality";
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185 | bestQualityUpdater.RightSideParameter.ActualName = QualityParameter.Name;
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186 |
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187 | analyzer2.Name = "Analyzer (placeholder)";
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188 | analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
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189 |
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190 | subScopesRemover.RemoveAllSubScopes = true;
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191 |
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192 | iterationsCounter.Name = "Iterations Counter";
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193 | iterationsCounter.Increment = new IntValue(1);
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194 | iterationsCounter.ValueParameter.ActualName = "Iterations";
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195 |
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196 | iterationsComparator.Name = "Iterations >= MaximumIterations";
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197 | iterationsComparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
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198 | iterationsComparator.LeftSideParameter.ActualName = "Iterations";
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199 | iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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200 | iterationsComparator.ResultParameter.ActualName = "Terminate";
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201 |
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202 | resultsCollector3.CopyValue = new BoolValue(true);
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203 | resultsCollector3.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Moves", null, "EvaluatedMoves"));
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204 | resultsCollector3.ResultsParameter.ActualName = ResultsParameter.Name;
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205 |
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206 | iterationsTermination.Name = "Iterations Termination Condition";
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207 | iterationsTermination.ConditionParameter.ActualName = "Terminate";
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208 | #endregion
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209 |
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210 | #region Create operator graph
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211 | OperatorGraph.InitialOperator = variableCreator;
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212 | variableCreator.Successor = subScopesProcessor0;
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213 | subScopesProcessor0.Operators.Add(bestQualityInitializer);
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214 | subScopesProcessor0.Successor = resultsCollector1;
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215 | bestQualityInitializer.Successor = analyzer1;
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216 | analyzer1.Successor = null;
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217 | resultsCollector1.Successor = resultsCollector2;
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218 | resultsCollector2.Successor = mainProcessor;
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219 | mainProcessor.Operators.Add(moveGenerator);
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220 | mainProcessor.Successor = iterationsCounter;
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221 | moveGenerator.Successor = moveEvaluationProcessor;
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222 | moveEvaluationProcessor.Operator = moveEvaluator;
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223 | moveEvaluationProcessor.Successor = bestSelector;
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224 | moveEvaluator.Successor = evaluatedMovesCounter;
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225 | evaluatedMovesCounter.Successor = null;
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226 | bestSelector.Successor = moveMakingProcessor;
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227 | moveMakingProcessor.Operators.Add(new EmptyOperator());
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228 | moveMakingProcessor.Operators.Add(selectedMoveMakingProcessor);
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229 | moveMakingProcessor.Successor = mergingReducer;
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230 | selectedMoveMakingProcessor.Operator = qualityComparator;
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231 | qualityComparator.Successor = improvesQualityBranch;
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232 | improvesQualityBranch.TrueBranch = moveMaker;
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233 | improvesQualityBranch.FalseBranch = null;
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234 | improvesQualityBranch.Successor = null;
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235 | moveMaker.Successor = bestQualityUpdater;
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236 | bestQualityUpdater.Successor = null;
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237 | mergingReducer.Successor = analyzer2;
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238 | analyzer2.Successor = subScopesRemover;
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239 | subScopesRemover.Successor = null;
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240 | iterationsCounter.Successor = iterationsComparator;
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241 | iterationsComparator.Successor = resultsCollector3;
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242 | resultsCollector3.Successor = iterationsTermination;
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243 | iterationsTermination.TrueBranch = null;
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244 | iterationsTermination.FalseBranch = mainProcessor;
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245 | #endregion
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246 | }
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247 |
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248 | public override IOperation Apply(IExecutionContext context) {
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249 | if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null)
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250 | return null;
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251 | return base.Apply(context);
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252 | }
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253 | }
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254 | }
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