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 System;
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23 | using System.Linq;
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24 | using HeuristicLab.Common;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Data;
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27 | using HeuristicLab.Operators;
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28 | using HeuristicLab.Optimization;
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29 | using HeuristicLab.Optimization.Operators;
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30 | using HeuristicLab.Parameters;
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31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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32 | using HeuristicLab.Selection;
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33 |
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34 | namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Algorithms {
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35 | [Item("GRASP+PR MainLoop", "The main loop that implements the behavior of the GRASP+PR algorithm.")]
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36 | [StorableClass]
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37 | public class GRASPWithPathRelinkingMainLoop : AlgorithmOperator {
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38 | public IValueLookupParameter<IOperator> SolutionCreatorParameter {
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39 | get { return (IValueLookupParameter<IOperator>)Parameters["SolutionCreator"]; }
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40 | }
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41 | public IValueLookupParameter<IOperator> EvaluatorParameter {
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42 | get { return (IValueLookupParameter<IOperator>)Parameters["Evaluator"]; }
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43 | }
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44 | public IValueLookupParameter<IntValue> EvaluatedSolutionsParameter {
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45 | get { return (IValueLookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
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46 | }
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47 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
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48 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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49 | }
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50 | public IValueLookupParameter<ResultCollection> ResultsParameter {
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51 | get { return (IValueLookupParameter<ResultCollection>)Parameters["Results"]; }
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52 | }
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53 | public IValueLookupParameter<IntValue> EliteSetSizeParameter {
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54 | get { return (IValueLookupParameter<IntValue>)Parameters["EliteSetSize"]; }
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55 | }
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56 | public IValueLookupParameter<IOperator> LocalImprovementParameter {
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57 | get { return (IValueLookupParameter<IOperator>)Parameters["LocalImprovement"]; }
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58 | }
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59 | public IValueLookupParameter<IOperator> PathRelinkingParameter {
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60 | get { return (IValueLookupParameter<IOperator>)Parameters["PathRelinking"]; }
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61 | }
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62 | public IValueLookupParameter<IOperator> EliteSetReplacerParameter {
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63 | get { return (IValueLookupParameter<IOperator>)Parameters["EliteSetReplacer"]; }
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64 | }
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65 | public IValueLookupParameter<IOperator> AnalyzerParameter {
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66 | get { return (IValueLookupParameter<IOperator>)Parameters["Analyzer"]; }
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67 | }
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68 |
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69 | [StorableConstructor]
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70 | protected GRASPWithPathRelinkingMainLoop(bool deserializing) : base(deserializing) { }
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71 | protected GRASPWithPathRelinkingMainLoop(GRASPWithPathRelinkingMainLoop original, Cloner cloner)
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72 | : base(original, cloner) { }
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73 | public GRASPWithPathRelinkingMainLoop()
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74 | : base() {
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75 | Parameters.Add(new ValueLookupParameter<IOperator>("SolutionCreator", "The solution creation procedure which ideally should be a greedy initialization heuristic."));
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76 | Parameters.Add(new ValueLookupParameter<IOperator>("Evaluator", "The evaluator which calculates the fitness of a solutions."));
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77 | Parameters.Add(new ValueLookupParameter<IntValue>("EvaluatedSolutions", "The number of evaluated solutions."));
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78 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The number of maximum iterations that should be performed."));
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79 | Parameters.Add(new ValueLookupParameter<ResultCollection>("Results", "Specifies where the results are stored."));
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80 | Parameters.Add(new ValueLookupParameter<IntValue>("EliteSetSize", "The size of the elite set."));
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81 | Parameters.Add(new ValueLookupParameter<IOperator>("LocalImprovement", "The operator which performs the local improvement."));
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82 | Parameters.Add(new ValueLookupParameter<IOperator>("PathRelinking", "The operator which performs the path relinking."));
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83 | Parameters.Add(new ValueLookupParameter<IOperator>("EliteSetReplacer", "The operator that replaces elements in the elite set."));
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84 | Parameters.Add(new ValueLookupParameter<IOperator>("Analyzer", "The analyzer that is to be applied."));
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85 |
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86 | var variableCreator1 = new VariableCreator();
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87 | variableCreator1.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0)));
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88 |
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89 | var variableCreator2 = new VariableCreator();
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90 | variableCreator2.CollectedValues.Add(new ValueParameter<IntValue>("ActualEliteSetSize", new IntValue(0));
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91 | variableCreator2.Name = "ActualEliteSetSize = 0";
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92 |
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93 | var subScopesCounter1 = new SubScopesCounter();
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94 | subScopesCounter1.Name = "ActualEliteSetSize += |SubScopes|";
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95 | subScopesCounter1.ValueParameter.ActualName = "ActualEliteSetSize";
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96 |
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97 | var comparator1 = new Comparator();
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98 | comparator1.Name = "ActualEliteSetSize >= MinimumEliteSetSize";
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99 | comparator1.Comparison.Value = ComparisonType.GreaterOrEqual;
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100 | comparator1.LeftSideParameter.ActualName = "ActualEliteSetSize";
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101 | comparator1.RightSideParameter.ActualName = EliteSetSizeParameter.ActualName;
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102 | comparator1.ResultParameter.ActualName = "SizeOkay";
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103 |
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104 | var conditionalBranch1 = new ConditionalBranch();
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105 | conditionalBranch1.Name = "Elite set has at least ρ elements";
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106 | conditionalBranch1.ConditionParameter.ActualName = "SizeOkay";
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107 |
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108 | var selector1 = new RandomSelector();
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109 | selector1.NumberOfSelectedSubScopesParameter.Value = new IntValue(1);
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110 | selector1.CopySelected.Value = true;
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111 |
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112 | var selector2 = new RandomSelector();
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113 | selector2.NumberOfSelectedSubScopesParameter.Value = new IntValue(0);
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114 |
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115 | var ssp1 = new SubScopesProcessor();
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116 |
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117 | var eo1 = new EmptyOperator();
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118 |
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119 | var solutionsCreator = new SolutionsCreator();
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120 | solutionsCreator.EvaluatorParameter.ActualName = EvaluatorParameter.Name;
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121 | solutionsCreator.SolutionCreatorParameter.ActualName = SolutionCreatorParameter.Name;
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122 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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123 |
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124 | var subScopesCounter2 = new SubScopesCounter();
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125 | subScopesCounter2.Name = "Count subscopes";
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126 | subScopesCounter2.ValueParameter.ActualName = "SolutionScopes";
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127 |
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128 | var comparator2 = new Comparator();
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129 | comparator2.Name = "SolutionScopes == 2";
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130 | comparator2.Comparison.Value = ComparisonType.Equal;
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131 | comparator2.LeftSideParameter.ActualName = "SolutionScopes";
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132 | comparator2.RightSideParameter.Value = new IntValue(2);
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133 | comparator2.ResultParameter.ActualName = "PerformPR";
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134 |
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135 | var conditionalBranch2 = new ConditionalBranch();
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136 | conditionalBranch2.Name = "Path relinking?";
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137 | conditionalBranch2.ConditionParameter.ActualName = "PerformPR";
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138 |
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139 | var ssp2 = new SubScopesProcessor();
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140 |
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141 | var eo2 = new EmptyOperator();
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142 |
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143 | var placeholder1 = new Placeholder();
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144 | placeholder1.Name = "(LocalImprovement)";
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145 | placeholder1.OperatorParameter.ActualName = LocalImprovementParameter.Name;
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146 |
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147 | var childrenCreator = new ChildrenCreator();
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148 | childrenCreator.ParentsPerChild = new IntValue(2);
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149 |
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150 | var placeholder2 = new Placeholder();
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151 | placeholder2.Name = "(PathRelinking)";
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152 | placeholder2.OperatorParameter.ActualName = PathRelinkingParameter.Name;
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153 |
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154 | var subScopesRemover = new SubScopesRemover();
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155 | subScopesRemover.RemoveAllSubScopes = true;
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156 |
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157 | var ssp3 = new SubScopesProcessor();
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158 |
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159 | var placeholder3 = new Placeholder();
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160 | placeholder3.Name = "(LocalImprovement)";
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161 | placeholder3.OperatorParameter.ActualName = LocalImprovementParameter.Name;
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162 |
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163 | var placeholder4 = new Placeholder();
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164 | placeholder4.Name = "(Replacer)";
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165 | placeholder4.OperatorParameter.ActualName = EliteSetReplacerParameter.Name;
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166 |
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167 | var counter = new IntCounter();
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168 | counter.Name = "Iterations++";
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169 | counter.ValueParameter.ActualName = "Iterations";
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170 | counter.Increment = new IntValue(1);
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171 |
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172 | var analyzer1 = new Placeholder();
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173 | analyzer1.Name = "(Analyzer)";
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174 | analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
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175 |
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176 | var comparator3 = new Comparator();
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177 | comparator3.Name = "Iterations >= MaximumIterations";
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178 | comparator3.Comparison.Value = ComparisonType.GreaterOrEqual;
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179 | comparator3.LeftSideParameter.ActualName = "Iterations";
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180 | comparator3.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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181 | comparator3.ResultParameter.ActualName = "TerminatedByIteration";
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182 |
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183 | var conditionalBranch3 = new ConditionalBranch();
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184 | conditionalBranch3.Name = "Terminate by Iterations?";
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185 | conditionalBranch3.ConditionParameter.ActualName = "TerminatedByIteration";
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186 |
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187 | OperatorGraph.InitialOperator = variableCreator1;
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188 | variableCreator1.Successor = variableCreator2;
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189 | variableCreator2.Successor = subScopesCounter1;
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190 | subScopesCounter1.Successor = comparator1;
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191 | comparator1.Successor = conditionalBranch1;
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192 | conditionalBranch1.TrueBranch = selector1;
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193 | conditionalBranch1.FalseBranch = selector2;
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194 | conditionalBranch1.Successor = ssp1;
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195 | ssp1.Operators.Add(eo1);
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196 | ssp1.Operators.Add(solutionsCreator);
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197 | ssp1.Successor = placeholder4;
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198 | eo1.Successor = null;
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199 | solutionsCreator.Successor = subScopesCounter2;
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200 | subScopesCounter2.Successor = comparator2;
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201 | comparator2.Successor = conditionalBranch2;
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202 | conditionalBranch2.TrueBranch = ssp2;
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203 | conditionalBranch2.FalseBranch = null;
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204 | conditionalBranch2.Successor = ssp3;
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205 | ssp2.Operators.Add(eo2);
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206 | ssp2.Operators.Add(placeholder1);
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207 | ssp2.Successor = null;
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208 | eo2.Successor = null;
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209 | placeholder1.Successor = childrenCreator;
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210 | childrenCreator.Successor = placeholder2;
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211 | placeholder2.Successor = subScopesRemover;
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212 | subScopesRemover.Successor = null;
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213 | ssp3.Operators.Add(placeholder3);
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214 | ssp3.Successor = null;
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215 | placeholder4.Successor = counter;
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216 | counter.Successor = analyzer1;
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217 | analyzer1.Successor = comparator3;
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218 | comparator3.Successor = conditionalBranch3;
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219 | conditionalBranch3.TrueBranch = null;
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220 | conditionalBranch3.FalseBranch = variableCreator2;
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221 | conditionalBranch3.Successor = null;
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222 | }
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223 |
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224 | public override IDeepCloneable Clone(Cloner cloner) {
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225 | return new GRASPWithPathRelinkingMainLoop(this, cloner);
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226 | }
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227 |
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228 | private void Parameterize() {
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229 | var operators = OperatorGraph.InitialOperator.Walk().ToArray();
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230 |
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231 | foreach (var solutionsCreator in operators.OfType<SolutionsCreator>()) {
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232 | solutionsCreator.SolutionCreatorParameter.ActualName = SolutionCreatorParameter.Name;
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233 | solutionsCreator.EvaluatorParameter.ActualName = EvaluatorParameter.Name;
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234 | }
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235 | }
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236 |
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237 | public event EventHandler ProblemChanged;
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238 | protected virtual void OnProblemChanged() {
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239 | Parameterize();
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240 | var handler = ProblemChanged;
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241 | if (handler != null) handler(this, EventArgs.Empty);
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242 | }
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243 | }
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244 | }
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