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.Core;
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23 | using HeuristicLab.Data;
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24 | using HeuristicLab.Operators;
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25 | using HeuristicLab.Optimization.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.GeneticAlgorithm {
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31 | /// <summary>
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32 | /// An operator which represents the main loop of a genetic algorithm.
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33 | /// </summary>
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34 | [Item("GeneticAlgorithmMainLoop", "An operator which represents the main loop of a genetic algorithm.")]
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35 | [StorableClass]
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36 | public sealed class GeneticAlgorithmMainLoop : 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 ScopeTreeLookupParameter<DoubleValue> QualityParameter {
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45 | get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["Quality"]; }
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46 | }
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47 | public ValueLookupParameter<IOperator> SelectorParameter {
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48 | get { return (ValueLookupParameter<IOperator>)Parameters["Selector"]; }
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49 | }
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50 | public ValueLookupParameter<IOperator> CrossoverParameter {
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51 | get { return (ValueLookupParameter<IOperator>)Parameters["Crossover"]; }
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52 | }
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53 | public ValueLookupParameter<PercentValue> MutationProbabilityParameter {
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54 | get { return (ValueLookupParameter<PercentValue>)Parameters["MutationProbability"]; }
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55 | }
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56 | public ValueLookupParameter<IOperator> MutatorParameter {
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57 | get { return (ValueLookupParameter<IOperator>)Parameters["Mutator"]; }
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58 | }
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59 | public ValueLookupParameter<IOperator> EvaluatorParameter {
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60 | get { return (ValueLookupParameter<IOperator>)Parameters["Evaluator"]; }
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61 | }
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62 | public ValueLookupParameter<IntValue> ElitesParameter {
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63 | get { return (ValueLookupParameter<IntValue>)Parameters["Elites"]; }
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64 | }
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65 | public ValueLookupParameter<IntValue> MaximumGenerationsParameter {
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66 | get { return (ValueLookupParameter<IntValue>)Parameters["MaximumGenerations"]; }
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67 | }
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68 | public ValueLookupParameter<VariableCollection> ResultsParameter {
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69 | get { return (ValueLookupParameter<VariableCollection>)Parameters["Results"]; }
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70 | }
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71 | public ValueLookupParameter<IOperator> AnalyzerParameter {
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72 | get { return (ValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
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73 | }
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74 | private ScopeParameter CurrentScopeParameter {
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75 | get { return (ScopeParameter)Parameters["CurrentScope"]; }
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76 | }
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77 |
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78 | public IScope CurrentScope {
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79 | get { return CurrentScopeParameter.ActualValue; }
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80 | }
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81 | #endregion
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82 |
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83 | [StorableConstructor]
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84 | private GeneticAlgorithmMainLoop(bool deserializing) : base() { }
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85 | public GeneticAlgorithmMainLoop()
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86 | : base() {
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87 | Initialize();
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88 | }
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89 |
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90 | private void Initialize() {
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91 | #region Create parameters
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92 | Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
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93 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
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94 | Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("Quality", "The value which represents the quality of a solution."));
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95 | Parameters.Add(new ValueLookupParameter<IOperator>("Selector", "The operator used to select solutions for reproduction."));
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96 | Parameters.Add(new ValueLookupParameter<IOperator>("Crossover", "The operator used to cross solutions."));
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97 | Parameters.Add(new ValueLookupParameter<PercentValue>("MutationProbability", "The probability that the mutation operator is applied on a solution."));
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98 | Parameters.Add(new ValueLookupParameter<IOperator>("Mutator", "The operator used to mutate solutions."));
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99 | Parameters.Add(new ValueLookupParameter<IOperator>("Evaluator", "The operator used to evaluate solutions."));
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100 | Parameters.Add(new ValueLookupParameter<IntValue>("Elites", "The numer of elite solutions which are kept in each generation."));
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101 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumGenerations", "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 | Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The operator used to analyze each generation."));
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104 | Parameters.Add(new ScopeParameter("CurrentScope", "The current scope which represents a population of solutions on which the genetic algorithm should be applied."));
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105 | #endregion
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106 |
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107 | #region Create operators
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108 | VariableCreator variableCreator = new VariableCreator();
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109 | ResultsCollector resultsCollector1 = new ResultsCollector();
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110 | Placeholder analyzer1 = new Placeholder();
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111 | Placeholder selector = new Placeholder();
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112 | SubScopesProcessor subScopesProcessor1 = new SubScopesProcessor();
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113 | ChildrenCreator childrenCreator = new ChildrenCreator();
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114 | UniformSubScopesProcessor uniformSubScopesProcessor = new UniformSubScopesProcessor();
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115 | Placeholder crossover = new Placeholder();
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116 | StochasticBranch stochasticBranch = new StochasticBranch();
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117 | Placeholder mutator = new Placeholder();
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118 | Placeholder evaluator = new Placeholder();
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119 | SubScopesRemover subScopesRemover = new SubScopesRemover();
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120 | SubScopesProcessor subScopesProcessor2 = new SubScopesProcessor();
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121 | BestSelector bestSelector = new BestSelector();
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122 | RightReducer rightReducer = new RightReducer();
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123 | MergingReducer mergingReducer = new MergingReducer();
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124 | IntCounter intCounter = new IntCounter();
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125 | Comparator comparator = new Comparator();
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126 | ResultsCollector resultsCollector2 = new ResultsCollector();
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127 | Placeholder analyzer2 = new Placeholder();
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128 | ConditionalBranch conditionalBranch = new ConditionalBranch();
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129 |
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130 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Generations", new IntValue(0))); // Class GeneticAlgorithm expects this to be called Generations
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131 |
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132 | resultsCollector1.CollectedValues.Add(new LookupParameter<IntValue>("Generations"));
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133 | resultsCollector1.ResultsParameter.ActualName = "Results";
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134 |
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135 | analyzer1.Name = "Analyzer";
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136 | analyzer1.OperatorParameter.ActualName = "Analyzer";
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137 |
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138 | selector.Name = "Selector";
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139 | selector.OperatorParameter.ActualName = "Selector";
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140 |
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141 | childrenCreator.ParentsPerChild = new IntValue(2);
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142 |
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143 | crossover.Name = "Crossover";
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144 | crossover.OperatorParameter.ActualName = "Crossover";
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145 |
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146 | stochasticBranch.ProbabilityParameter.ActualName = "MutationProbability";
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147 | stochasticBranch.RandomParameter.ActualName = "Random";
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148 |
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149 | mutator.Name = "Mutator";
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150 | mutator.OperatorParameter.ActualName = "Mutator";
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151 |
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152 | evaluator.Name = "Evaluator";
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153 | evaluator.OperatorParameter.ActualName = "Evaluator";
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154 |
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155 | subScopesRemover.RemoveAllSubScopes = true;
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156 |
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157 | bestSelector.CopySelected = new BoolValue(false);
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158 | bestSelector.MaximizationParameter.ActualName = "Maximization";
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159 | bestSelector.NumberOfSelectedSubScopesParameter.ActualName = "Elites";
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160 | bestSelector.QualityParameter.ActualName = "Quality";
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161 |
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162 | intCounter.Increment = new IntValue(1);
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163 | intCounter.ValueParameter.ActualName = "Generations";
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164 |
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165 | comparator.Comparison = new Comparison(ComparisonType.GreaterOrEqual);
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166 | comparator.LeftSideParameter.ActualName = "Generations";
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167 | comparator.ResultParameter.ActualName = "Terminate";
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168 | comparator.RightSideParameter.ActualName = "MaximumGenerations";
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169 |
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170 | resultsCollector2.CollectedValues.Add(new LookupParameter<IntValue>("Generations"));
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171 | resultsCollector2.ResultsParameter.ActualName = "Results";
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172 |
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173 | analyzer2.Name = "Analyzer";
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174 | analyzer2.OperatorParameter.ActualName = "Analyzer";
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175 |
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176 | conditionalBranch.ConditionParameter.ActualName = "Terminate";
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177 | #endregion
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178 |
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179 | #region Create operator graph
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180 | OperatorGraph.InitialOperator = variableCreator;
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181 | variableCreator.Successor = resultsCollector1;
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182 | resultsCollector1.Successor = analyzer1;
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183 | analyzer1.Successor = selector;
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184 | selector.Successor = subScopesProcessor1;
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185 | subScopesProcessor1.Operators.Add(new EmptyOperator());
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186 | subScopesProcessor1.Operators.Add(childrenCreator);
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187 | subScopesProcessor1.Successor = subScopesProcessor2;
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188 | childrenCreator.Successor = uniformSubScopesProcessor;
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189 | uniformSubScopesProcessor.Operator = crossover;
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190 | uniformSubScopesProcessor.Successor = null;
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191 | crossover.Successor = stochasticBranch;
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192 | stochasticBranch.FirstBranch = mutator;
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193 | stochasticBranch.SecondBranch = null;
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194 | stochasticBranch.Successor = evaluator;
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195 | mutator.Successor = null;
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196 | evaluator.Successor = subScopesRemover;
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197 | subScopesRemover.Successor = null;
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198 | subScopesProcessor2.Operators.Add(bestSelector);
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199 | subScopesProcessor2.Operators.Add(new EmptyOperator());
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200 | subScopesProcessor2.Successor = mergingReducer;
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201 | bestSelector.Successor = rightReducer;
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202 | rightReducer.Successor = null;
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203 | mergingReducer.Successor = intCounter;
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204 | intCounter.Successor = comparator;
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205 | comparator.Successor = resultsCollector2;
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206 | resultsCollector2.Successor = analyzer2;
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207 | analyzer2.Successor = conditionalBranch;
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208 | conditionalBranch.FalseBranch = selector;
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209 | conditionalBranch.TrueBranch = null;
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210 | conditionalBranch.Successor = null;
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211 | #endregion
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212 | }
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213 |
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214 | public override IOperation Apply() {
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215 | if (CrossoverParameter.ActualValue == null)
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216 | return null;
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217 | return base.Apply();
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218 | }
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219 | }
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220 | }
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