1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2012 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.Algorithms.LocalSearch;
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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;
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28 | using HeuristicLab.Optimization.Operators;
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29 | using HeuristicLab.Parameters;
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30 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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31 |
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32 | namespace HeuristicLab.Algorithms.ScatterSearch {
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33 | /// <summary>
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34 | /// An operator which represents a scatter search.
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35 | /// </summary>
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36 | [Item("ScatterSearchMainLoop", "An operator which represents the main loop of a scatter search.")]
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37 | [StorableClass]
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38 | public sealed class ScatterSearchMainLoop : AlgorithmOperator {
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39 | #region Parameter properties
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40 | internal LookupParameter<IRandom> RandomParameter {
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41 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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42 | }
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43 | internal LookupParameter<IntValue> IterationsParameter {
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44 | get { return (LookupParameter<IntValue>)Parameters["Iterations"]; }
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45 | }
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46 | internal LookupParameter<IntValue> MaximumIterationsParameter {
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47 | get { return (LookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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48 | }
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49 | internal LookupParameter<IntValue> SampleSizeParameter {
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50 | get { return (LookupParameter<IntValue>)Parameters["SampleSize"]; }
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51 | }
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52 | internal LookupParameter<IntValue> PopulationSizeParameter {
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53 | get { return (LookupParameter<IntValue>)Parameters["PopulationSize"]; }
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54 | }
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55 | internal LookupParameter<IntValue> ReferenceSetSizeParameter {
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56 | get { return (LookupParameter<IntValue>)Parameters["ReferenceSetSize"]; }
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57 | }
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58 | internal LookupParameter<IntValue> NumberOfHighQualitySolutionsParameter {
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59 | get { return (LookupParameter<IntValue>)Parameters["NumberOfHighQualitySolutions"]; }
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60 | }
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61 | internal LookupParameter<VariableCollection> ResultsParameter {
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62 | get { return (LookupParameter<VariableCollection>)Parameters["Results"]; }
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63 | }
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64 | internal LookupParameter<IMultiAnalyzer> AnalyzerParameter {
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65 | get { return (LookupParameter<IMultiAnalyzer>)Parameters["Analyzer"]; }
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66 | }
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67 | #endregion
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68 |
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69 | #region Properties
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70 | public IRandom Random {
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71 | get { return RandomParameter.ActualValue; }
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72 | set { RandomParameter.ActualValue = value; }
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73 | }
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74 | public IntValue Iterations {
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75 | get { return IterationsParameter.ActualValue; }
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76 | set { IterationsParameter.ActualValue = value; }
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77 | }
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78 | public IntValue MaximumIterations {
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79 | get { return MaximumIterationsParameter.ActualValue; }
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80 | set { MaximumIterationsParameter.ActualValue = value; }
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81 | }
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82 | public IntValue SampleSize {
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83 | get { return SampleSizeParameter.ActualValue; }
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84 | set { SampleSizeParameter.ActualValue = value; }
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85 | }
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86 | public IntValue PopulationSize {
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87 | get { return PopulationSizeParameter.ActualValue; }
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88 | set { PopulationSizeParameter.ActualValue = value; }
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89 | }
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90 | public IntValue ReferenceSetSize {
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91 | get { return ReferenceSetSizeParameter.ActualValue; }
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92 | set { ReferenceSetSizeParameter.ActualValue = value; }
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93 | }
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94 | public IntValue NumberOfHighQualitySolutions {
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95 | get { return NumberOfHighQualitySolutionsParameter.ActualValue; }
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96 | set { NumberOfHighQualitySolutionsParameter.ActualValue = value; }
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97 | }
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98 | public VariableCollection Results {
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99 | get { return ResultsParameter.ActualValue; }
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100 | set { ResultsParameter.ActualValue = value; }
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101 | }
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102 | public IMultiAnalyzer Analyzer {
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103 | get { return AnalyzerParameter.ActualValue; }
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104 | set { AnalyzerParameter.ActualValue = value; }
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105 | }
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106 | #endregion
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107 |
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108 | [StorableConstructor]
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109 | private ScatterSearchMainLoop(bool deserializing) : base(deserializing) { }
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110 | private ScatterSearchMainLoop(ScatterSearchMainLoop original, Cloner cloner) : base(original, cloner) { }
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111 | public ScatterSearchMainLoop() : base() { Initialize(); }
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112 |
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113 | public override IDeepCloneable Clone(Cloner cloner) {
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114 | return new ScatterSearchMainLoop(this, cloner);
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115 | }
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116 |
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117 | private void Initialize() {
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118 | #region Create parameters
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119 | Parameters.Add(new LookupParameter<IRandom>("Random", "A pseudo random number generator."));
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120 | Parameters.Add(new LookupParameter<IntValue>("Iterations", "The number of iterations performed."));
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121 | Parameters.Add(new LookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed."));
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122 | Parameters.Add(new LookupParameter<IntValue>("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators."));
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123 | Parameters.Add(new LookupParameter<IntValue>("PopulationSize", "The size of the population."));
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124 | Parameters.Add(new LookupParameter<IntValue>("ReferenceSetSize", "The size of the reference set."));
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125 | Parameters.Add(new LookupParameter<IntValue>("NumberOfHighQualitySolutions", "The number of high quality solutions that should be added to the reference set."));
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126 | Parameters.Add(new LookupParameter<IOperator>("SolutionCreator", "The operator which is used to create new solutions."));
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127 | Parameters.Add(new LookupParameter<IOperator>("Evaluator", "The operator which is used to evaluate new solutions. This operator is executed in parallel, if an engine is used which supports parallelization."));
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128 | Parameters.Add(new LookupParameter<IOperator>("Improver", "The operator which is used to improve new solutions. This operator is executed in parallelm, if an engine is used which supports parallelization."));
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129 | Parameters.Add(new LookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
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130 | Parameters.Add(new LookupParameter<IOperator>("MoveGenerator", "The operator that generates the moves."));
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131 | Parameters.Add(new LookupParameter<IOperator>("MoveMaker", "The operator that performs a move and updates the quality."));
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132 | Parameters.Add(new LookupParameter<IOperator>("MoveEvaluator", "The operator that evaluates a move."));
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133 | Parameters.Add(new LookupParameter<IMultiAnalyzer>("Analyzer", "The operator used to analyze the solution and moves."));
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134 | #endregion
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135 |
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136 | #region Create operators
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137 | Assigner assigner1 = new Assigner();
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138 | Assigner assigner2 = new Assigner();
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139 | ChildrenCreator childrenCreator = new ChildrenCreator();
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140 | Comparator iterationsChecker = new Comparator();
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141 | ConditionalBranch newSolutionsBranch = new ConditionalBranch();
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142 | ConditionalBranch terminateBranch = new ConditionalBranch();
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143 | IntCounter interationsCounter = new IntCounter();
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144 | LocalSearchImprovementOperator localImprovementOperator = new LocalSearchImprovementOperator();
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145 | Placeholder solutionImprover = new Placeholder();
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146 | Placeholder solutionEvaluator = new Placeholder();
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147 | PopulationRebuildMethod populationRebuildMethod = new PopulationRebuildMethod();
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148 | ResultsCollector resultsCollector = new ResultsCollector();
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149 | ReferenceSetUpdateMethod referenceSetUpdateMethod = new ReferenceSetUpdateMethod();
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150 | SolutionCombinationMethod solutionCombinationMethod = new SolutionCombinationMethod();
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151 | SolutionPoolUpdateMethod solutionPoolUpdateMethod = new SolutionPoolUpdateMethod();
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152 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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153 | SubScopesProcessor subScopesProcessor1 = new SubScopesProcessor();
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154 | SubScopesProcessor subScopesProcessor2 = new SubScopesProcessor();
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155 | SubScopesProcessor subScopesProcessor3 = new SubScopesProcessor();
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156 | UniformSubScopesProcessor uniformSubScopesProcessor1 = new UniformSubScopesProcessor();
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157 | UniformSubScopesProcessor uniformSubScopesProcessor2 = new UniformSubScopesProcessor();
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158 | UniformSubScopesProcessor uniformSubScopesProcessor3 = new UniformSubScopesProcessor();
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159 | #endregion
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160 |
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161 | #region Create operator graph
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162 | OperatorGraph.InitialOperator = interationsCounter;
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163 | assigner1.Name = "NewSolutions = true";
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164 | assigner1.LeftSideParameter.ActualName = "NewSolutions";
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165 | assigner1.RightSideParameter.Value = new BoolValue(true);
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166 | assigner1.Successor = newSolutionsBranch;
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167 |
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168 | assigner2.Name = "NewSolutions = false";
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169 | assigner2.LeftSideParameter.ActualName = "NewSolutions";
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170 | assigner2.RightSideParameter.Value = new BoolValue(false);
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171 | assigner2.Successor = uniformSubScopesProcessor1;
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172 |
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173 | childrenCreator.Name = "SubsetGenerator";
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174 | childrenCreator.ParentsPerChildParameter.Value = new IntValue(2);
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175 | childrenCreator.Successor = assigner2;
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176 |
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177 | iterationsChecker.Name = "IterationsChecker";
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178 | iterationsChecker.Comparison.Value = ComparisonType.GreaterOrEqual;
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179 | iterationsChecker.LeftSideParameter.ActualName = "Iterations";
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180 | iterationsChecker.RightSideParameter.ActualName = "MaximumIterations";
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181 | iterationsChecker.ResultParameter.ActualName = "Terminate";
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182 | iterationsChecker.Successor = terminateBranch;
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183 |
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184 | localImprovementOperator.Name = "ImprovementMethod";
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185 | localImprovementOperator.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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186 | localImprovementOperator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
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187 | localImprovementOperator.Successor = null;
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188 |
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189 | newSolutionsBranch.Name = "NewSolutionChecker";
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190 | newSolutionsBranch.ConditionParameter.ActualName = "NewSolutions";
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191 | newSolutionsBranch.TrueBranch = subScopesProcessor1;
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192 | newSolutionsBranch.FalseBranch = populationRebuildMethod;
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193 | newSolutionsBranch.Successor = null;
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194 |
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195 | terminateBranch.Name = "TerminateChecker";
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196 | terminateBranch.ConditionParameter.ActualName = "Terminate";
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197 | terminateBranch.TrueBranch = new EmptyOperator();
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198 | terminateBranch.FalseBranch = referenceSetUpdateMethod;
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199 | terminateBranch.Successor = null;
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200 |
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201 | interationsCounter.Name = "IterationCounter";
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202 | interationsCounter.IncrementParameter.Value = new IntValue(1);
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203 | interationsCounter.ValueParameter.ActualName = "Iterations";
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204 | interationsCounter.Successor = resultsCollector;
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205 |
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206 | solutionImprover.Name = "SolutionImprover";
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207 | solutionImprover.OperatorParameter.ActualName = "LocalImprovementOperator";
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208 | solutionImprover.Successor = solutionEvaluator;
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209 |
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210 | solutionEvaluator.Name = "SolutionEvaluator";
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211 | solutionEvaluator.OperatorParameter.ActualName = "Evaluator";
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212 | solutionEvaluator.Successor = null;
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213 |
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214 | populationRebuildMethod.Successor = subScopesProcessor3;
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215 |
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216 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>(IterationsParameter.Name));
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217 | resultsCollector.ResultsParameter.ActualName = ResultsParameter.Name;
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218 | resultsCollector.Successor = iterationsChecker;
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219 |
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220 | referenceSetUpdateMethod.Successor = assigner1;
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221 |
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222 | solutionCombinationMethod.Successor = subScopesProcessor2;
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223 |
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224 | solutionsCreator.Name = "DiversificationGenerationMethod";
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225 | solutionsCreator.NumberOfSolutionsParameter.ActualName = "PopulationSize";
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226 | solutionsCreator.Successor = uniformSubScopesProcessor3;
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227 |
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228 | subScopesProcessor1.DepthParameter.Value = new IntValue(1);
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229 | subScopesProcessor1.Operators.Add(new EmptyOperator());
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230 | subScopesProcessor1.Operators.Add(childrenCreator);
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231 | subScopesProcessor1.Successor = newSolutionsBranch;
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232 |
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233 | subScopesProcessor2.DepthParameter.Value = new IntValue(1);
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234 | subScopesProcessor2.Operators.Add(new EmptyOperator());
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235 | subScopesProcessor2.Operators.Add(new EmptyOperator());
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236 | subScopesProcessor2.Operators.Add(uniformSubScopesProcessor2);
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237 | subScopesProcessor2.Successor = null;
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238 |
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239 | subScopesProcessor3.DepthParameter.Value = new IntValue(1);
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240 | subScopesProcessor3.Operators.Add(solutionsCreator);
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241 | subScopesProcessor3.Operators.Add(new EmptyOperator());
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242 | subScopesProcessor3.Successor = interationsCounter;
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243 |
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244 | uniformSubScopesProcessor1.DepthParameter.Value = new IntValue(1);
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245 | uniformSubScopesProcessor1.Operator = solutionCombinationMethod;
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246 | uniformSubScopesProcessor1.Successor = solutionPoolUpdateMethod;
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247 |
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248 | uniformSubScopesProcessor2.DepthParameter.Value = new IntValue(1);
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249 | uniformSubScopesProcessor2.Operator = solutionImprover;
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250 | uniformSubScopesProcessor2.Successor = null;
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251 |
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252 | uniformSubScopesProcessor3.DepthParameter.Value = new IntValue(1);
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253 | uniformSubScopesProcessor3.Operator = localImprovementOperator;
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254 | uniformSubScopesProcessor3.Successor = null;
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255 | #endregion
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256 | }
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257 |
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258 | public override IOperation Apply() {
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259 | return base.Apply();
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260 | }
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261 | }
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262 | }
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