1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2015 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.Analysis;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Data;
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29 | using HeuristicLab.Operators;
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30 | using HeuristicLab.Optimization;
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31 | using HeuristicLab.Optimization.Operators;
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32 | using HeuristicLab.Parameters;
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33 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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34 | using HeuristicLab.Random;
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35 |
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36 | namespace HeuristicLab.Algorithms.LocalSearch {
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37 | [Item("Local Search (LS)", "A local search algorithm.")]
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38 | [Creatable(CreatableAttribute.Categories.SingleSolutionAlgorithms, Priority = 100)]
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39 | [StorableType("7EC750E2-0DC5-4C07-89E5-F5C66D9AD0A3")]
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40 | public sealed class LocalSearch : HeuristicOptimizationEngineAlgorithm, IStorableContent {
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41 | public string Filename { get; set; }
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42 |
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43 | #region Problem Properties
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44 | public override Type ProblemType {
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45 | get { return typeof(ISingleObjectiveHeuristicOptimizationProblem); }
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46 | }
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47 | public new ISingleObjectiveHeuristicOptimizationProblem Problem {
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48 | get { return (ISingleObjectiveHeuristicOptimizationProblem)base.Problem; }
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49 | set { base.Problem = value; }
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50 | }
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51 | #endregion
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52 |
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53 | #region Parameter Properties
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54 | private ValueParameter<IntValue> SeedParameter {
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55 | get { return (ValueParameter<IntValue>)Parameters["Seed"]; }
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56 | }
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57 | private ValueParameter<BoolValue> SetSeedRandomlyParameter {
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58 | get { return (ValueParameter<BoolValue>)Parameters["SetSeedRandomly"]; }
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59 | }
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60 | public IConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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61 | get { return (IConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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62 | }
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63 | public IConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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64 | get { return (IConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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65 | }
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66 | public IConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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67 | get { return (IConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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68 | }
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69 | private ValueParameter<IntValue> MaximumIterationsParameter {
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70 | get { return (ValueParameter<IntValue>)Parameters["MaximumIterations"]; }
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71 | }
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72 | private ValueParameter<IntValue> SampleSizeParameter {
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73 | get { return (ValueParameter<IntValue>)Parameters["SampleSize"]; }
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74 | }
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75 | private ValueParameter<MultiAnalyzer> AnalyzerParameter {
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76 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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77 | }
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78 | #endregion
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79 |
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80 | #region Properties
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81 | public IntValue Seed {
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82 | get { return SeedParameter.Value; }
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83 | set { SeedParameter.Value = value; }
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84 | }
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85 | public BoolValue SetSeedRandomly {
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86 | get { return SetSeedRandomlyParameter.Value; }
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87 | set { SetSeedRandomlyParameter.Value = value; }
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88 | }
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89 | public IMoveGenerator MoveGenerator {
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90 | get { return MoveGeneratorParameter.Value; }
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91 | set { MoveGeneratorParameter.Value = value; }
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92 | }
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93 | public IMoveMaker MoveMaker {
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94 | get { return MoveMakerParameter.Value; }
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95 | set { MoveMakerParameter.Value = value; }
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96 | }
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97 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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98 | get { return MoveEvaluatorParameter.Value; }
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99 | set { MoveEvaluatorParameter.Value = value; }
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100 | }
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101 | public IntValue MaximumIterations {
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102 | get { return MaximumIterationsParameter.Value; }
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103 | set { MaximumIterationsParameter.Value = value; }
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104 | }
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105 | public IntValue SampleSize {
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106 | get { return SampleSizeParameter.Value; }
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107 | set { SampleSizeParameter.Value = value; }
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108 | }
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109 | public MultiAnalyzer Analyzer {
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110 | get { return AnalyzerParameter.Value; }
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111 | set { AnalyzerParameter.Value = value; }
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112 | }
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113 | private RandomCreator RandomCreator {
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114 | get { return (RandomCreator)OperatorGraph.InitialOperator; }
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115 | }
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116 | private SolutionsCreator SolutionsCreator {
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117 | get { return (SolutionsCreator)RandomCreator.Successor; }
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118 | }
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119 | private LocalSearchMainLoop MainLoop {
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120 | get { return FindMainLoop(SolutionsCreator.Successor); }
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121 | }
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122 | [Storable]
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123 | private BestAverageWorstQualityAnalyzer moveQualityAnalyzer;
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124 | #endregion
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125 |
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126 | [StorableConstructor]
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127 | private LocalSearch(bool deserializing) : base(deserializing) { }
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128 | [StorableHook(HookType.AfterDeserialization)]
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129 | private void AfterDeserialization() {
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130 | Initialize();
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131 | }
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132 | private LocalSearch(LocalSearch original, Cloner cloner)
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133 | : base(original, cloner) {
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134 | moveQualityAnalyzer = cloner.Clone(original.moveQualityAnalyzer);
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135 | Initialize();
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136 | }
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137 | public override IDeepCloneable Clone(Cloner cloner) {
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138 | return new LocalSearch(this, cloner);
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139 | }
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140 | public LocalSearch()
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141 | : base() {
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142 | 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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143 | 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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144 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
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145 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
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146 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
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147 | Parameters.Add(new ValueParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(1000)));
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148 | Parameters.Add(new ValueParameter<IntValue>("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators.", new IntValue(100)));
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149 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution and moves.", new MultiAnalyzer()));
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150 |
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151 | RandomCreator randomCreator = new RandomCreator();
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152 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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153 | VariableCreator variableCreator = new VariableCreator();
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154 | ResultsCollector resultsCollector = new ResultsCollector();
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155 | LocalSearchMainLoop mainLoop = new LocalSearchMainLoop();
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156 | OperatorGraph.InitialOperator = randomCreator;
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157 |
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158 | randomCreator.RandomParameter.ActualName = "Random";
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159 | randomCreator.SeedParameter.ActualName = SeedParameter.Name;
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160 | randomCreator.SeedParameter.Value = null;
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161 | randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
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162 | randomCreator.SetSeedRandomlyParameter.Value = null;
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163 | randomCreator.Successor = solutionsCreator;
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164 |
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165 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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166 | solutionsCreator.Successor = variableCreator;
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167 |
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168 | variableCreator.Name = "Initialize EvaluatedMoves";
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169 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("EvaluatedMoves", new IntValue()));
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170 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0)));
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171 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>("BestQuality", new DoubleValue(0)));
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172 | variableCreator.Successor = resultsCollector;
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173 |
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174 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Moves", null, "EvaluatedMoves"));
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175 | resultsCollector.ResultsParameter.ActualName = "Results";
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176 | resultsCollector.Successor = mainLoop;
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177 |
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178 | mainLoop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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179 | mainLoop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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180 | mainLoop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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181 | mainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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182 | mainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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183 | mainLoop.ResultsParameter.ActualName = "Results";
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184 | mainLoop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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185 | mainLoop.EvaluatedMovesParameter.ActualName = "EvaluatedMoves";
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186 | mainLoop.IterationsParameter.ActualName = "Iterations";
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187 | mainLoop.BestLocalQualityParameter.ActualName = "BestQuality";
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188 |
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189 | moveQualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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190 | ParameterizeAnalyzers();
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191 | UpdateAnalyzers();
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192 |
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193 | Initialize();
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194 | }
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195 |
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196 | public override void Prepare() {
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197 | if (Problem != null && MoveGenerator != null && MoveMaker != null && MoveEvaluator != null)
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198 | base.Prepare();
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199 | }
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200 |
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201 | #region Events
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202 | protected override void OnProblemChanged() {
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203 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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204 | ParameterizeStochasticOperator(Problem.Evaluator);
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205 | foreach (IOperator op in Problem.Operators.OfType<IOperator>()) ParameterizeStochasticOperator(op);
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206 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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207 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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208 | }
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209 | ParameterizeSolutionsCreator();
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210 | ParameterizeMainLoop();
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211 | UpdateMoveGenerator();
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212 | UpdateMoveParameters();
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213 | UpdateAnalyzers();
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214 | ParameterizeMoveGenerators();
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215 | ParameterizeMoveEvaluators();
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216 | ParameterizeMoveMakers();
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217 | ParameterizeAnalyzers();
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218 | ParameterizeIterationBasedOperators();
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219 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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220 | base.OnProblemChanged();
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221 | }
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222 | protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) {
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223 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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224 | ParameterizeSolutionsCreator();
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225 | base.Problem_SolutionCreatorChanged(sender, e);
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226 | }
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227 | protected override void Problem_EvaluatorChanged(object sender, EventArgs e) {
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228 | ParameterizeStochasticOperator(Problem.Evaluator);
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229 | ParameterizeSolutionsCreator();
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230 | ParameterizeMainLoop();
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231 | ParameterizeMoveEvaluators();
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232 | ParameterizeMoveMakers();
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233 | ParameterizeAnalyzers();
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234 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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235 | base.Problem_EvaluatorChanged(sender, e);
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236 | }
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237 | protected override void Problem_OperatorsChanged(object sender, EventArgs e) {
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238 | foreach (IOperator op in Problem.Operators.OfType<IOperator>()) ParameterizeStochasticOperator(op);
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239 | // This may seem pointless, but some operators already have the eventhandler registered, others don't
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240 | // FIXME: Is there another way to solve this problem?
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241 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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242 | op.MoveQualityParameter.ActualNameChanged -= new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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243 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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244 | }
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245 | UpdateMoveGenerator();
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246 | UpdateMoveParameters();
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247 | UpdateAnalyzers();
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248 | ParameterizeMainLoop();
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249 | ParameterizeMoveGenerators();
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250 | ParameterizeMoveEvaluators();
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251 | ParameterizeMoveMakers();
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252 | ParameterizeAnalyzers();
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253 | ParameterizeIterationBasedOperators();
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254 | base.Problem_OperatorsChanged(sender, e);
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255 | }
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256 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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257 | ParameterizeMainLoop();
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258 | ParameterizeMoveEvaluators();
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259 | ParameterizeMoveMakers();
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260 | }
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261 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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262 | UpdateMoveParameters();
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263 | }
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264 | private void MoveEvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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265 | ParameterizeMainLoop();
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266 | ParameterizeMoveEvaluators();
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267 | ParameterizeMoveMakers();
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268 | ParameterizeAnalyzers();
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269 | }
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270 | private void MoveEvaluator_MoveQualityParameter_ActualNameChanged(object sender, EventArgs e) {
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271 | ParameterizeMainLoop();
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272 | ParameterizeMoveEvaluators();
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273 | ParameterizeMoveMakers();
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274 | ParameterizeAnalyzers();
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275 | }
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276 | #endregion
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277 |
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278 | #region Helpers
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279 | private void Initialize() {
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280 | if (Problem != null) {
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281 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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282 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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283 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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284 | }
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285 | }
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286 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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287 | MoveEvaluatorParameter.ValueChanged += new EventHandler(MoveEvaluatorParameter_ValueChanged);
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288 | }
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289 | private void UpdateMoveGenerator() {
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290 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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291 | IMoveGenerator defaultMoveGenerator = Problem.Operators.OfType<IMoveGenerator>().FirstOrDefault();
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292 | MoveGeneratorParameter.ValidValues.Clear();
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293 | if (Problem != null) {
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294 | foreach (IMoveGenerator generator in Problem.Operators.OfType<IMoveGenerator>().OrderBy(x => x.Name))
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295 | MoveGeneratorParameter.ValidValues.Add(generator);
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296 | }
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297 | if (oldMoveGenerator != null) {
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298 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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299 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
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300 | else oldMoveGenerator = null;
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301 | }
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302 | if (oldMoveGenerator == null && defaultMoveGenerator != null)
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303 | MoveGenerator = defaultMoveGenerator;
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304 | if (MoveGenerator == null) {
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305 | ClearMoveParameters();
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306 | }
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307 | }
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308 | private void UpdateMoveParameters() {
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309 | IMoveMaker oldMoveMaker = MoveMaker;
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310 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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311 | ClearMoveParameters();
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312 | if (MoveGenerator != null) {
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313 | List<Type> moveTypes = MoveGenerator.GetType().GetInterfaces().Where(x => typeof(IMoveOperator).IsAssignableFrom(x)).ToList();
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314 | foreach (Type type in moveTypes.ToList()) {
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315 | if (moveTypes.Any(t => t != type && type.IsAssignableFrom(t)))
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316 | moveTypes.Remove(type);
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317 | }
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318 |
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319 | var operators = Problem.Operators.Where(op => moveTypes.Any(m => m.IsInstanceOfType(op))).ToList();
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320 | IMoveMaker defaultMoveMaker = operators.OfType<IMoveMaker>().FirstOrDefault();
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321 | ISingleObjectiveMoveEvaluator defaultMoveEvaluator = operators.OfType<ISingleObjectiveMoveEvaluator>().FirstOrDefault();
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322 | foreach (IMoveMaker moveMaker in operators.OfType<IMoveMaker>().OrderBy(op => op.Name))
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323 | MoveMakerParameter.ValidValues.Add(moveMaker);
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324 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in operators.OfType<ISingleObjectiveMoveEvaluator>().OrderBy(op => op.Name))
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325 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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326 |
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327 | if (oldMoveMaker != null) {
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328 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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329 | if (mm != null) MoveMaker = mm;
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330 | else oldMoveMaker = null;
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331 | }
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332 | if (oldMoveMaker == null && defaultMoveMaker != null)
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333 | MoveMaker = defaultMoveMaker;
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334 |
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335 | if (oldMoveEvaluator != null) {
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336 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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337 | if (me != null) MoveEvaluator = me;
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338 | else oldMoveEvaluator = null;
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339 | }
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340 | if (oldMoveEvaluator == null && defaultMoveEvaluator != null)
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341 | MoveEvaluator = defaultMoveEvaluator;
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342 | }
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343 | }
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344 | private void UpdateAnalyzers() {
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345 | Analyzer.Operators.Clear();
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346 | if (Problem != null) {
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347 | foreach (IAnalyzer analyzer in Problem.Operators.OfType<IAnalyzer>()) {
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348 | foreach (IScopeTreeLookupParameter param in analyzer.Parameters.OfType<IScopeTreeLookupParameter>())
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349 | param.Depth = 0;
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350 | Analyzer.Operators.Add(analyzer, analyzer.EnabledByDefault);
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351 | }
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352 | }
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353 | Analyzer.Operators.Add(moveQualityAnalyzer, moveQualityAnalyzer.EnabledByDefault);
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354 | }
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355 | private void ClearMoveParameters() {
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356 | MoveMakerParameter.ValidValues.Clear();
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357 | MoveEvaluatorParameter.ValidValues.Clear();
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358 | }
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359 | private void ParameterizeSolutionsCreator() {
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360 | SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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361 | SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name;
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362 | }
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363 | private void ParameterizeMainLoop() {
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364 | if (Problem != null) {
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365 | MainLoop.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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366 | MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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367 | MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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368 | }
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369 | if (MoveEvaluator != null)
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370 | MainLoop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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371 | }
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372 | private void ParameterizeStochasticOperator(IOperator op) {
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373 | if (op is IStochasticOperator) {
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374 | IStochasticOperator stOp = (IStochasticOperator)op;
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375 | stOp.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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376 | stOp.RandomParameter.Hidden = true;
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377 | }
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378 | }
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379 | private void ParameterizeMoveGenerators() {
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380 | if (Problem != null) {
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381 | foreach (IMultiMoveGenerator generator in Problem.Operators.OfType<IMultiMoveGenerator>()) {
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382 | generator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
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383 | generator.SampleSizeParameter.Hidden = true;
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384 | }
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385 | }
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386 | }
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387 | private void ParameterizeMoveEvaluators() {
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388 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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389 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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390 | op.QualityParameter.Hidden = true;
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391 | }
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392 | }
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393 | private void ParameterizeMoveMakers() {
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394 | foreach (IMoveMaker op in Problem.Operators.OfType<IMoveMaker>()) {
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395 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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396 | op.QualityParameter.Hidden = true;
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397 | if (MoveEvaluator != null) {
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398 | op.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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399 | op.MoveQualityParameter.Hidden = true;
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400 | } else {
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401 | op.MoveQualityParameter.Hidden = false;
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402 | }
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403 | }
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404 | }
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405 | private void ParameterizeAnalyzers() {
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406 | moveQualityAnalyzer.ResultsParameter.ActualName = "Results";
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407 | moveQualityAnalyzer.ResultsParameter.Hidden = true;
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408 | if (Problem != null) {
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409 | moveQualityAnalyzer.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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410 | moveQualityAnalyzer.MaximizationParameter.Hidden = true;
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411 | if (MoveEvaluator != null) {
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412 | moveQualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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413 | moveQualityAnalyzer.QualityParameter.Hidden = true;
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414 | } else moveQualityAnalyzer.QualityParameter.Hidden = false;
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415 | moveQualityAnalyzer.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
|
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416 | moveQualityAnalyzer.BestKnownQualityParameter.Hidden = true;
|
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417 | } else {
|
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418 | moveQualityAnalyzer.MaximizationParameter.Hidden = false;
|
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419 | moveQualityAnalyzer.BestKnownQualityParameter.Hidden = false;
|
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420 | }
|
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421 | }
|
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422 | private void ParameterizeIterationBasedOperators() {
|
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423 | if (Problem != null) {
|
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424 | foreach (IIterationBasedOperator op in Problem.Operators.OfType<IIterationBasedOperator>()) {
|
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425 | op.IterationsParameter.ActualName = "Iterations";
|
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426 | op.IterationsParameter.Hidden = true;
|
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427 | op.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
|
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428 | op.MaximumIterationsParameter.Hidden = true;
|
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429 | }
|
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430 | }
|
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431 | }
|
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432 | private LocalSearchMainLoop FindMainLoop(IOperator start) {
|
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433 | IOperator mainLoop = start;
|
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434 | while (mainLoop != null && !(mainLoop is LocalSearchMainLoop))
|
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435 | mainLoop = ((SingleSuccessorOperator)mainLoop).Successor;
|
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436 | if (mainLoop == null) return null;
|
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437 | else return (LocalSearchMainLoop)mainLoop;
|
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438 | }
|
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439 | #endregion
|
---|
440 | }
|
---|
441 | }
|
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