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 System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Data;
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27 | using HeuristicLab.Optimization;
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28 | using HeuristicLab.Operators;
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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.PluginInfrastructure;
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33 |
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34 | namespace HeuristicLab.Algorithms.LocalSearch {
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35 | [Item("LocalSearch", "A local search algorithm.")]
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36 | [Creatable("Algorithms")]
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37 | public sealed class LocalSearch : EngineAlgorithm {
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38 | #region Problem Properties
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39 | public override Type ProblemType {
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40 | get { return typeof(ISingleObjectiveProblem); }
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41 | }
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42 | public new ISingleObjectiveProblem Problem {
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43 | get { return (ISingleObjectiveProblem)base.Problem; }
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44 | set { base.Problem = value; }
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45 | }
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46 | #endregion
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47 |
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48 | #region Parameter Properties
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49 | private ValueParameter<IntValue> SeedParameter {
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50 | get { return (ValueParameter<IntValue>)Parameters["Seed"]; }
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51 | }
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52 | private ValueParameter<BoolValue> SetSeedRandomlyParameter {
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53 | get { return (ValueParameter<BoolValue>)Parameters["SetSeedRandomly"]; }
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54 | }
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55 | private ConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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56 | get { return (ConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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57 | }
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58 | private ConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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59 | get { return (ConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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60 | }
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61 | private ConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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62 | get { return (ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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63 | }
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64 | private ValueParameter<IntValue> MaximumIterationsParameter {
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65 | get { return (ValueParameter<IntValue>)Parameters["MaximumIterations"]; }
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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 IntValue Seed {
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71 | get { return SeedParameter.Value; }
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72 | set { SeedParameter.Value = value; }
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73 | }
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74 | public BoolValue SetSeedRandomly {
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75 | get { return SetSeedRandomlyParameter.Value; }
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76 | set { SetSeedRandomlyParameter.Value = value; }
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77 | }
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78 | public IMoveGenerator MoveGenerator {
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79 | get { return MoveGeneratorParameter.Value; }
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80 | set { MoveGeneratorParameter.Value = value; }
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81 | }
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82 | public IMoveMaker MoveMaker {
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83 | get { return MoveMakerParameter.Value; }
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84 | set { MoveMakerParameter.Value = value; }
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85 | }
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86 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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87 | get { return MoveEvaluatorParameter.Value; }
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88 | set { MoveEvaluatorParameter.Value = value; }
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89 | }
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90 | public IntValue MaximumIterations {
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91 | get { return MaximumIterationsParameter.Value; }
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92 | set { MaximumIterationsParameter.Value = value; }
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93 | }
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94 | private RandomCreator RandomCreator {
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95 | get { return (RandomCreator)OperatorGraph.InitialOperator; }
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96 | }
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97 | private SolutionsCreator SolutionsCreator {
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98 | get { return (SolutionsCreator)RandomCreator.Successor; }
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99 | }
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100 | private LocalSearchMainLoop MainLoop {
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101 | get { return (LocalSearchMainLoop)SolutionsCreator.Successor; }
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102 | }
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103 | #endregion
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104 |
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105 | public LocalSearch()
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106 | : base() {
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107 | Parameters.Add(new ValueParameter<IntValue>("Seed", "The random seed used to initialize the new pseudo random number generator.", new IntValue(0)));
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108 | Parameters.Add(new ValueParameter<BoolValue>("SetSeedRandomly", "True if the random seed should be set to a random value, otherwise false.", new BoolValue(true)));
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109 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
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110 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
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111 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
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112 | Parameters.Add(new ValueParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(1000)));
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113 |
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114 | RandomCreator randomCreator = new RandomCreator();
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115 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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116 | LocalSearchMainLoop lsMainLoop = new LocalSearchMainLoop();
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117 | OperatorGraph.InitialOperator = randomCreator;
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118 |
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119 | randomCreator.RandomParameter.ActualName = "Random";
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120 | randomCreator.SeedParameter.ActualName = SeedParameter.Name;
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121 | randomCreator.SeedParameter.Value = null;
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122 | randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
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123 | randomCreator.SetSeedRandomlyParameter.Value = null;
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124 | randomCreator.Successor = solutionsCreator;
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125 |
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126 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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127 | solutionsCreator.Successor = lsMainLoop;
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128 |
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129 | lsMainLoop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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130 | lsMainLoop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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131 | lsMainLoop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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132 | lsMainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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133 | lsMainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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134 | lsMainLoop.ResultsParameter.ActualName = "Results";
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135 |
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136 | Initialize();
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137 | }
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138 |
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139 | [StorableConstructor]
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140 | private LocalSearch(bool deserializing) : base() { }
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141 |
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142 | public override IDeepCloneable Clone(Cloner cloner) {
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143 | LocalSearch clone = (LocalSearch)base.Clone(cloner);
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144 | clone.Initialize();
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145 | return clone;
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146 | }
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147 |
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148 | #region Events
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149 | protected override void OnProblemChanged() {
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150 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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151 | ParameterizeStochasticOperator(Problem.Evaluator);
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152 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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153 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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154 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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155 | }
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156 | ParameterizeSolutionsCreator();
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157 | ParameterizeLSMainLoop();
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158 | ParameterizeMoveEvaluator();
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159 | ParameterizeMoveMaker();
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160 | UpdateMoveGenerator();
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161 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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162 | base.OnProblemChanged();
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163 | }
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164 | protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) {
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165 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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166 | ParameterizeSolutionsCreator();
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167 | base.Problem_SolutionCreatorChanged(sender, e);
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168 | }
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169 | protected override void Problem_EvaluatorChanged(object sender, EventArgs e) {
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170 | ParameterizeStochasticOperator(Problem.Evaluator);
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171 | ParameterizeSolutionsCreator();
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172 | ParameterizeLSMainLoop();
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173 | ParameterizeMoveEvaluator();
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174 | ParameterizeMoveMaker();
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175 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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176 | base.Problem_EvaluatorChanged(sender, e);
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177 | }
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178 | protected override void Problem_OperatorsChanged(object sender, EventArgs e) {
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179 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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180 | // This may seem pointless, but some operators already have the eventhandler registered, others don't
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181 | // FIXME: Is there another way to solve this problem?
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182 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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183 | op.MoveQualityParameter.ActualNameChanged -= new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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184 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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185 | }
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186 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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187 | UpdateMoveGenerator();
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188 | if (oldMoveGenerator == MoveGenerator) // in this case MoveGeneratorParameter_ValueChanged did not fire
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189 | UpdateMoveParameters();
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190 | ParameterizeLSMainLoop();
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191 | ParameterizeMoveEvaluator();
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192 | ParameterizeMoveMaker();
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193 | base.Problem_OperatorsChanged(sender, e);
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194 | }
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195 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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196 | ParameterizeLSMainLoop();
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197 | ParameterizeMoveEvaluator();
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198 | ParameterizeMoveMaker();
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199 | }
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200 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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201 | UpdateMoveParameters();
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202 | }
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203 | private void MoveEvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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204 | ParameterizeLSMainLoop();
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205 | ParameterizeMoveEvaluator();
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206 | ParameterizeMoveMaker();
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207 | }
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208 | private void MoveEvaluator_MoveQualityParameter_ActualNameChanged(object sender, EventArgs e) {
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209 | ParameterizeLSMainLoop();
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210 | ParameterizeMoveEvaluator();
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211 | ParameterizeMoveMaker();
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212 | }
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213 | #endregion
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214 |
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215 | #region Helpers
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216 | [StorableHook(HookType.AfterDeserialization)]
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217 | private void Initialize() {
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218 | if (Problem != null) {
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219 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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220 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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221 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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222 | }
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223 | }
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224 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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225 | MoveEvaluatorParameter.ValueChanged += new EventHandler(MoveEvaluatorParameter_ValueChanged);
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226 | }
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227 | private void UpdateMoveGenerator() {
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228 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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229 | MoveGeneratorParameter.ValidValues.Clear();
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230 | if (Problem != null) {
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231 | foreach (IMoveGenerator generator in Problem.Operators.OfType<IMoveGenerator>().OrderBy(x => x.Name))
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232 | MoveGeneratorParameter.ValidValues.Add(generator);
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233 | }
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234 | if (oldMoveGenerator != null && MoveGeneratorParameter.ValidValues.Any(x => x.GetType() == oldMoveGenerator.GetType()))
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235 | MoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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236 | if (MoveGenerator == null) {
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237 | ClearMoveParameters();
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238 | }
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239 | }
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240 | private void UpdateMoveParameters() {
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241 | IMoveMaker oldMoveMaker = MoveMaker;
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242 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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243 | ClearMoveParameters();
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244 | List<Type> moveTypes = MoveGenerator.GetType().GetInterfaces().Where(x => typeof(IMoveOperator).IsAssignableFrom(x)).ToList();
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245 | foreach (Type type in moveTypes.ToList()) {
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246 | if (moveTypes.Any(t => t != type && type.IsAssignableFrom(t)))
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247 | moveTypes.Remove(type);
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248 | }
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249 | foreach (Type type in moveTypes) {
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250 | var operators = Problem.Operators.Where(x => type.IsAssignableFrom(x.GetType())).OrderBy(x => x.Name);
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251 | foreach (IMoveMaker moveMaker in operators.OfType<IMoveMaker>())
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252 | MoveMakerParameter.ValidValues.Add(moveMaker);
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253 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in operators.OfType<ISingleObjectiveMoveEvaluator>())
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254 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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255 | }
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256 | if (oldMoveMaker != null) {
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257 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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258 | if (mm != null) MoveMaker = mm;
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259 | }
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260 | if (oldMoveEvaluator != null) {
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261 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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262 | if (me != null) MoveEvaluator = me;
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263 | }
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264 | }
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265 | private void ClearMoveParameters() {
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266 | MoveMakerParameter.ValidValues.Clear();
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267 | MoveEvaluatorParameter.ValidValues.Clear();
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268 | }
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269 | private void ParameterizeSolutionsCreator() {
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270 | SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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271 | SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name;
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272 | }
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273 | private void ParameterizeLSMainLoop() {
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274 | MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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275 | MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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276 | if (MoveEvaluator != null)
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277 | MainLoop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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278 | }
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279 | private void ParameterizeStochasticOperator(IOperator op) {
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280 | if (op is IStochasticOperator)
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281 | ((IStochasticOperator)op).RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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282 | }
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283 | private void ParameterizeMoveEvaluator() {
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284 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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285 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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286 | }
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287 | }
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288 | private void ParameterizeMoveMaker() {
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289 | foreach (IMoveMaker op in Problem.Operators.OfType<IMoveMaker>()) {
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290 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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291 | if (MoveEvaluator != null)
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292 | op.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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293 | }
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294 | }
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295 | #endregion
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296 | }
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297 | }
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