| 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using HeuristicLab.Common;
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| 23 | using HeuristicLab.Core;
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| 24 | using HeuristicLab.Data;
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| 25 | using HeuristicLab.Operators;
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| 26 | using HeuristicLab.Optimization;
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| 27 | using HeuristicLab.Optimization.Operators;
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| 28 | using HeuristicLab.Parameters;
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| 29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 30 | using HeuristicLab.Selection;
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| 31 |
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| 32 | namespace HeuristicLab.Algorithms.ScatterSearch {
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| 33 | /// <summary>
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| 34 | /// An operator which represents a scatter search.
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| 35 | /// </summary>
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| 36 | [Item("ScatterSearchMainLoop", "An operator which represents a scatter search.")]
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| 37 | [StorableClass]
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| 38 | public sealed class ScatterSearchMainLoop : AlgorithmOperator {
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| 39 | #region Parameter properties
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| 40 | public IValueLookupParameter<IMultiAnalyzer> AnalyzerParameter {
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| 41 | get { return (IValueLookupParameter<IMultiAnalyzer>)Parameters["Analyzer"]; }
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| 42 | }
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| 43 | public IValueLookupParameter<DoubleValue> BestKnownQualityParameter {
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| 44 | get { return (IValueLookupParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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| 45 | }
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| 46 | public IValueLookupParameter<ICrossover> CrossoverParameter {
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| 47 | get { return (IValueLookupParameter<ICrossover>)Parameters["Crossover"]; }
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| 48 | }
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| 49 | public IValueLookupParameter<IntValue> EvaluatedSolutionsParameter {
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| 50 | get { return (IValueLookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
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| 51 | }
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| 52 | public IValueLookupParameter<IEvaluator> EvaluatorParameter {
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| 53 | get { return (IValueLookupParameter<IEvaluator>)Parameters["Evaluator"]; }
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| 54 | }
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| 55 | public IValueLookupParameter<BoolValue> ExecutePathRelinkingParameter {
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| 56 | get { return (IValueLookupParameter<BoolValue>)Parameters["ExecutePathRelinking"]; }
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| 57 | }
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| 58 | public IValueLookupParameter<IImprovementOperator> ImproverParameter {
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| 59 | get { return (IValueLookupParameter<IImprovementOperator>)Parameters["Improver"]; }
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| 60 | }
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| 61 | public IValueLookupParameter<IntValue> IterationsParameter {
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| 62 | get { return (IValueLookupParameter<IntValue>)Parameters["Iterations"]; }
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| 63 | }
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| 64 | public IValueLookupParameter<BoolValue> MaximizationParameter {
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| 65 | get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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| 66 | }
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| 67 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
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| 68 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 69 | }
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| 70 | public IValueLookupParameter<IntValue> NumberOfHighQualitySolutionsParameter {
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| 71 | get { return (IValueLookupParameter<IntValue>)Parameters["NumberOfHighQualitySolutions"]; }
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| 72 | }
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| 73 | public IValueLookupParameter<IPathRelinker> PathRelinkerParameter {
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| 74 | get { return (IValueLookupParameter<IPathRelinker>)Parameters["PathRelinker"]; }
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| 75 | }
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| 76 | public IValueLookupParameter<IntValue> PopulationSizeParameter {
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| 77 | get { return (IValueLookupParameter<IntValue>)Parameters["PopulationSize"]; }
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| 78 | }
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| 79 | public IValueLookupParameter<IntValue> ReferenceSetSizeParameter {
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| 80 | get { return (IValueLookupParameter<IntValue>)Parameters["ReferenceSetSize"]; }
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| 81 | }
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| 82 | public IValueLookupParameter<DoubleValue> QualityParameter {
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| 83 | get { return (IValueLookupParameter<DoubleValue>)Parameters["Quality"]; }
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| 84 | }
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| 85 | public IValueLookupParameter<IRandom> RandomParameter {
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| 86 | get { return (IValueLookupParameter<IRandom>)Parameters["Random"]; }
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| 87 | }
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| 88 | public IValueLookupParameter<VariableCollection> ResultsParameter {
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| 89 | get { return (IValueLookupParameter<VariableCollection>)Parameters["Results"]; }
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| 90 | }
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| 91 | public IValueLookupParameter<ISolutionSimilarityCalculator> SimilarityCalculatorParameter {
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| 92 | get { return (IValueLookupParameter<ISolutionSimilarityCalculator>)Parameters["SimilarityCalculator"]; }
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| 93 | }
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| 94 | #endregion
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| 95 |
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| 96 | #region Properties
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| 97 | private IMultiAnalyzer Analyzer {
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| 98 | get { return AnalyzerParameter.ActualValue; }
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| 99 | set { AnalyzerParameter.ActualValue = value; }
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| 100 | }
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| 101 | private DoubleValue BestKnownQuality {
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| 102 | get { return BestKnownQualityParameter.ActualValue; }
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| 103 | set { BestKnownQualityParameter.ActualValue = value; }
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| 104 | }
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| 105 | private ICrossover Crossover {
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| 106 | get { return CrossoverParameter.ActualValue; }
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| 107 | set { CrossoverParameter.ActualValue = value; }
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| 108 | }
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| 109 | private IntValue EvaluatedSolutions {
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| 110 | get { return EvaluatedSolutionsParameter.ActualValue; }
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| 111 | set { EvaluatedSolutionsParameter.ActualValue = value; }
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| 112 | }
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| 113 | private IEvaluator Evaluator {
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| 114 | get { return EvaluatorParameter.ActualValue; }
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| 115 | set { EvaluatorParameter.ActualValue = value; }
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| 116 | }
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| 117 | private BoolValue ExecutePathRelinking {
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| 118 | get { return ExecutePathRelinkingParameter.ActualValue; }
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| 119 | set { ExecutePathRelinkingParameter.ActualValue = value; }
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| 120 | }
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| 121 | private IImprovementOperator Improver {
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| 122 | get { return ImproverParameter.ActualValue; }
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| 123 | set { ImproverParameter.ActualValue = value; }
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| 124 | }
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| 125 | private IntValue Iterations {
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| 126 | get { return IterationsParameter.ActualValue; }
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| 127 | set { IterationsParameter.ActualValue = value; }
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| 128 | }
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| 129 | private BoolValue Maximization {
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| 130 | get { return MaximizationParameter.ActualValue; }
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| 131 | set { MaximizationParameter.ActualValue = value; }
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| 132 | }
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| 133 | private IntValue MaximumIterations {
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| 134 | get { return MaximumIterationsParameter.ActualValue; }
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| 135 | set { MaximumIterationsParameter.ActualValue = value; }
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| 136 | }
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| 137 | private IntValue NumberOfHighQualitySolutions {
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| 138 | get { return NumberOfHighQualitySolutionsParameter.ActualValue; }
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| 139 | set { NumberOfHighQualitySolutionsParameter.ActualValue = value; }
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| 140 | }
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| 141 | private IPathRelinker PathRelinker {
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| 142 | get { return PathRelinkerParameter.ActualValue; }
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| 143 | set { PathRelinkerParameter.ActualValue = value; }
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| 144 | }
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| 145 | private IntValue PopulationSize {
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| 146 | get { return PopulationSizeParameter.ActualValue; }
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| 147 | set { PopulationSizeParameter.ActualValue = value; }
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| 148 | }
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| 149 | private IntValue ReferenceSetSize {
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| 150 | get { return ReferenceSetSizeParameter.ActualValue; }
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| 151 | set { ReferenceSetSizeParameter.ActualValue = value; }
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| 152 | }
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| 153 | private DoubleValue Quality {
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| 154 | get { return QualityParameter.ActualValue; }
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| 155 | set { QualityParameter.ActualValue = value; }
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| 156 | }
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| 157 | private IRandom Random {
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| 158 | get { return RandomParameter.ActualValue; }
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| 159 | set { RandomParameter.ActualValue = value; }
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| 160 | }
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| 161 | private VariableCollection Results {
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| 162 | get { return ResultsParameter.ActualValue; }
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| 163 | set { ResultsParameter.ActualValue = value; }
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| 164 | }
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| 165 | private ISolutionSimilarityCalculator SimilarityCalculator {
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| 166 | get { return SimilarityCalculatorParameter.ActualValue; }
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| 167 | set { SimilarityCalculatorParameter.ActualValue = value; }
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| 168 | }
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| 169 | #endregion
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| 170 |
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| 171 | [StorableConstructor]
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| 172 | private ScatterSearchMainLoop(bool deserializing) : base(deserializing) { }
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| 173 | private ScatterSearchMainLoop(ScatterSearchMainLoop original, Cloner cloner) : base(original, cloner) { }
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| 174 | public ScatterSearchMainLoop() : base() { Initialize(); }
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| 175 |
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| 176 | public override IDeepCloneable Clone(Cloner cloner) {
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| 177 | return new ScatterSearchMainLoop(this, cloner);
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| 178 | }
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| 179 |
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| 180 | private void Initialize() {
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| 181 | #region Create parameters
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| 182 | Parameters.Add(new ValueLookupParameter<IMultiAnalyzer>("Analyzer", "The analyzer used to analyze each iteration."));
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| 183 | Parameters.Add(new ValueLookupParameter<DoubleValue>("BestKnownQuality", "The best known quality value found so far."));
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| 184 | Parameters.Add(new ValueLookupParameter<ICrossover>("Crossover", "The operator used to cross solutions."));
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| 185 | Parameters.Add(new ValueLookupParameter<IntValue>("EvaluatedSolutions", "The number of times solutions have been evaluated."));
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| 186 | Parameters.Add(new ValueLookupParameter<IEvaluator>("Evaluator", "The operator used to evaluate solutions. This operator is executed in parallel, if an engine is used which supports parallelization."));
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| 187 | Parameters.Add(new ValueLookupParameter<BoolValue>("ExecutePathRelinking", "True if path relinking should be executed instead of crossover, otherwise false."));
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| 188 | Parameters.Add(new ValueLookupParameter<IImprovementOperator>("Improver", "The operator used to improve solutions."));
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| 189 | Parameters.Add(new ValueLookupParameter<IntValue>("Iterations", "The number of iterations performed."));
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| 190 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, otherwise false."));
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| 191 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of iterations which should be processed."));
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| 192 | Parameters.Add(new ValueLookupParameter<IntValue>("NumberOfHighQualitySolutions", "The number of high quality solutions in the reference set."));
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| 193 | Parameters.Add(new ValueLookupParameter<IPathRelinker>("PathRelinker", "The operator used to execute path relinking."));
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| 194 | Parameters.Add(new ValueLookupParameter<IntValue>("PopulationSize", "The size of the population of solutions."));
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| 195 | Parameters.Add(new ValueLookupParameter<IntValue>("ReferenceSetSize", "The size of the reference set."));
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| 196 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Quality", "This parameter is used for name translation only."));
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| 197 | Parameters.Add(new ValueLookupParameter<IRandom>("Random", "A pseudo random number generator."));
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| 198 | Parameters.Add(new ValueLookupParameter<VariableCollection>("Results", "The variable collection where results should be stored."));
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| 199 | Parameters.Add(new ValueLookupParameter<ISolutionSimilarityCalculator>("SimilarityCalculator", "The operator used to calculate the similarity between two solutions."));
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| 200 | #endregion
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| 201 |
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| 202 | #region Create operators
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| 203 | Placeholder analyzer = new Placeholder();
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| 204 | Assigner assigner1 = new Assigner();
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| 205 | Assigner assigner2 = new Assigner();
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| 206 | ChildrenCreator childrenCreator = new ChildrenCreator();
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| 207 | Placeholder crossover = new Placeholder();
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| 208 | Comparator iterationsChecker = new Comparator();
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| 209 | IntCounter iterationsCounter = new IntCounter();
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| 210 | MergingReducer mergingReducer = new MergingReducer();
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| 211 | ConditionalBranch executePathRelinkingBranch = new ConditionalBranch();
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| 212 | ConditionalBranch newSolutionsBranch = new ConditionalBranch();
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| 213 | OffspringProcessor offspringProcessor = new OffspringProcessor();
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| 214 | Placeholder pathRelinker = new Placeholder();
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| 215 | PopulationRebuildMethod populationRebuildMethod = new PopulationRebuildMethod();
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| 216 | ReferenceSetUpdateMethod referenceSetUpdateMethod = new ReferenceSetUpdateMethod();
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| 217 | ResultsCollector resultsCollector = new ResultsCollector();
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| 218 | RightSelector rightSelector = new RightSelector();
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| 219 | Placeholder solutionEvaluator1 = new Placeholder();
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| 220 | Placeholder solutionEvaluator2 = new Placeholder();
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| 221 | Placeholder solutionImprover1 = new Placeholder();
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| 222 | Placeholder solutionImprover2 = new Placeholder();
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| 223 | SolutionPoolUpdateMethod solutionPoolUpdateMethod = new SolutionPoolUpdateMethod();
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| 224 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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| 225 | DataReducer dataReducer1 = new DataReducer();
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| 226 | DataReducer dataReducer2 = new DataReducer();
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| 227 | SubScopesProcessor subScopesProcessor1 = new SubScopesProcessor();
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| 228 | SubScopesProcessor subScopesProcessor2 = new SubScopesProcessor();
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| 229 | SubScopesProcessor subScopesProcessor3 = new SubScopesProcessor();
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| 230 | SubScopesProcessor subScopesProcessor4 = new SubScopesProcessor();
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| 231 | ConditionalBranch terminateBranch = new ConditionalBranch();
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| 232 | UniformSubScopesProcessor uniformSubScopesProcessor1 = new UniformSubScopesProcessor();
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| 233 | UniformSubScopesProcessor uniformSubScopesProcessor2 = new UniformSubScopesProcessor();
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| 234 | UniformSubScopesProcessor uniformSubScopesProcessor3 = new UniformSubScopesProcessor();
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| 235 | VariableCreator variableCreator = new VariableCreator();
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| 236 | #endregion
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| 237 |
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| 238 | #region Create operator graph
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| 239 | OperatorGraph.InitialOperator = variableCreator;
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| 240 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(IterationsParameter.Name, new IntValue(0)));
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| 241 | variableCreator.CollectedValues.Add(new ValueParameter<BoolValue>("NewSolutions", new BoolValue(false)));
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| 242 | variableCreator.Successor = resultsCollector;
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| 243 |
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| 244 | resultsCollector.CopyValue = new BoolValue(false);
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| 245 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>(IterationsParameter.Name));
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| 246 | resultsCollector.ResultsParameter.ActualName = ResultsParameter.Name;
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| 247 | resultsCollector.Successor = iterationsChecker;
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| 248 |
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| 249 | iterationsChecker.Name = "IterationsChecker";
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| 250 | iterationsChecker.Comparison.Value = ComparisonType.GreaterOrEqual;
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| 251 | iterationsChecker.LeftSideParameter.ActualName = IterationsParameter.Name;
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| 252 | iterationsChecker.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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| 253 | iterationsChecker.ResultParameter.ActualName = "Terminate";
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| 254 | iterationsChecker.Successor = terminateBranch;
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| 255 |
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| 256 | terminateBranch.Name = "TerminateChecker";
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| 257 | terminateBranch.ConditionParameter.ActualName = "Terminate";
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| 258 | terminateBranch.FalseBranch = referenceSetUpdateMethod;
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| 259 |
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| 260 | referenceSetUpdateMethod.Successor = assigner1;
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| 261 |
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| 262 | assigner1.Name = "NewSolutions = true";
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| 263 | assigner1.LeftSideParameter.ActualName = "NewSolutions";
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| 264 | assigner1.RightSideParameter.Value = new BoolValue(true);
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| 265 | assigner1.Successor = subScopesProcessor1;
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| 266 |
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| 267 | subScopesProcessor1.DepthParameter.Value = new IntValue(1);
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| 268 | subScopesProcessor1.Operators.Add(new EmptyOperator());
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| 269 | subScopesProcessor1.Operators.Add(childrenCreator);
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| 270 | subScopesProcessor1.Successor = newSolutionsBranch;
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| 271 |
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| 272 | childrenCreator.Name = "SubsetGenerator";
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| 273 | childrenCreator.ParentsPerChildParameter.Value = new IntValue(2);
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| 274 | childrenCreator.Successor = assigner2;
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| 275 |
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| 276 | assigner2.Name = "NewSolutions = false";
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| 277 | assigner2.LeftSideParameter.ActualName = "NewSolutions";
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| 278 | assigner2.RightSideParameter.Value = new BoolValue(false);
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| 279 | assigner2.Successor = uniformSubScopesProcessor1;
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| 280 |
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| 281 | uniformSubScopesProcessor1.DepthParameter.Value = new IntValue(1);
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| 282 | uniformSubScopesProcessor1.Operator = executePathRelinkingBranch;
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| 283 | uniformSubScopesProcessor1.Successor = solutionPoolUpdateMethod;
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| 284 |
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| 285 | executePathRelinkingBranch.Name = "ExecutePathRelinkingChecker";
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| 286 | executePathRelinkingBranch.ConditionParameter.ActualName = ExecutePathRelinkingParameter.ActualName;
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| 287 | executePathRelinkingBranch.TrueBranch = pathRelinker;
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| 288 | executePathRelinkingBranch.FalseBranch = crossover;
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| 289 |
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| 290 | pathRelinker.Name = "PathRelinker";
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| 291 | pathRelinker.OperatorParameter.ActualName = PathRelinkerParameter.Name;
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| 292 | pathRelinker.Successor = rightSelector;
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| 293 |
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| 294 | crossover.Name = "Crossover";
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| 295 | crossover.OperatorParameter.ActualName = CrossoverParameter.Name;
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| 296 | crossover.Successor = offspringProcessor;
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| 297 |
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| 298 | offspringProcessor.Successor = rightSelector;
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| 299 |
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| 300 | rightSelector.NumberOfSelectedSubScopesParameter.Value = new IntValue(1);
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| 301 | rightSelector.CopySelected = new BoolValue(false);
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| 302 | rightSelector.Successor = subScopesProcessor2;
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| 303 |
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| 304 | subScopesProcessor2.DepthParameter.Value = new IntValue(1);
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| 305 | subScopesProcessor2.Operators.Add(new EmptyOperator());
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| 306 | subScopesProcessor2.Operators.Add(uniformSubScopesProcessor2);
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| 307 | subScopesProcessor2.Successor = mergingReducer;
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| 308 |
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| 309 | uniformSubScopesProcessor2.DepthParameter.Value = new IntValue(2);
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| 310 | uniformSubScopesProcessor2.Operator = solutionImprover1;
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| 311 | uniformSubScopesProcessor2.ParallelParameter.Value = new BoolValue(true);
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| 312 | uniformSubScopesProcessor2.Successor = subScopesProcessor4;
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| 313 |
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| 314 | solutionImprover1.Name = "SolutionImprover";
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| 315 | solutionImprover1.OperatorParameter.ActualName = ImproverParameter.Name;
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| 316 | solutionImprover1.Successor = solutionEvaluator1;
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| 317 |
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| 318 | solutionEvaluator1.Name = "SolutionEvaluator";
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| 319 | solutionEvaluator1.OperatorParameter.ActualName = EvaluatorParameter.Name;
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| 320 |
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| 321 | subScopesProcessor4.Operators.Add(dataReducer1);
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| 322 |
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| 323 | dataReducer1.Name = "Increment EvaluatedSolutions";
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| 324 | dataReducer1.ParameterToReduce.ActualName = "LocalEvaluatedSolutions";
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| 325 | dataReducer1.TargetParameter.ActualName = EvaluatedSolutionsParameter.Name;
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| 326 | dataReducer1.ReductionOperation.Value = new ReductionOperation(ReductionOperations.Sum);
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| 327 | dataReducer1.TargetOperation.Value = new ReductionOperation(ReductionOperations.Sum);
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| 328 |
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| 329 | solutionPoolUpdateMethod.QualityParameter.ActualName = QualityParameter.ActualName;
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| 330 | solutionPoolUpdateMethod.Successor = analyzer;
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| 331 |
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| 332 | analyzer.Name = "Analyzer";
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| 333 | analyzer.OperatorParameter.ActualName = AnalyzerParameter.Name;
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| 334 |
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| 335 | newSolutionsBranch.Name = "NewSolutionsChecker";
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| 336 | newSolutionsBranch.ConditionParameter.ActualName = "NewSolutions";
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| 337 | newSolutionsBranch.TrueBranch = subScopesProcessor1;
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| 338 | newSolutionsBranch.FalseBranch = populationRebuildMethod;
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| 339 |
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| 340 | populationRebuildMethod.QualityParameter.ActualName = QualityParameter.ActualName;
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| 341 | populationRebuildMethod.Successor = subScopesProcessor3;
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| 342 |
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| 343 | subScopesProcessor3.DepthParameter.Value = new IntValue(1);
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| 344 | subScopesProcessor3.Operators.Add(solutionsCreator);
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| 345 | subScopesProcessor3.Operators.Add(new EmptyOperator());
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| 346 | subScopesProcessor3.Successor = iterationsCounter;
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| 347 |
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| 348 | solutionsCreator.Name = "DiversificationGenerationMethod";
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| 349 | solutionsCreator.NumberOfSolutionsParameter.ActualName = PopulationSizeParameter.Name;
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| 350 | solutionsCreator.Successor = uniformSubScopesProcessor3;
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| 351 |
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| 352 | uniformSubScopesProcessor3.DepthParameter.Value = new IntValue(1);
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| 353 | uniformSubScopesProcessor3.Operator = solutionImprover2;
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| 354 | uniformSubScopesProcessor3.ParallelParameter.Value = new BoolValue(true);
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| 355 | uniformSubScopesProcessor3.Successor = dataReducer2;
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| 356 |
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| 357 | solutionImprover2.Name = "SolutionImprover";
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| 358 | solutionImprover2.OperatorParameter.ActualName = ImproverParameter.Name;
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| 359 | solutionImprover2.Successor = solutionEvaluator2;
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| 360 |
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| 361 | solutionEvaluator2.Name = "SolutionEvaluator";
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| 362 | solutionEvaluator2.OperatorParameter.ActualName = EvaluatorParameter.Name;
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| 363 |
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| 364 | dataReducer2.Name = "Increment EvaluatedSolutions";
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| 365 | dataReducer2.ParameterToReduce.ActualName = "LocalEvaluatedSolutions";
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| 366 | dataReducer2.TargetParameter.ActualName = EvaluatedSolutionsParameter.Name;
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| 367 | dataReducer2.ReductionOperation.Value = new ReductionOperation(ReductionOperations.Sum);
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| 368 | dataReducer2.TargetOperation.Value = new ReductionOperation(ReductionOperations.Sum);
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| 369 |
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| 370 | iterationsCounter.Name = "IterationCounter";
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| 371 | iterationsCounter.IncrementParameter.Value = new IntValue(1);
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| 372 | iterationsCounter.ValueParameter.ActualName = IterationsParameter.Name;
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| 373 | iterationsCounter.Successor = resultsCollector;
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| 374 | #endregion
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| 375 | }
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| 376 |
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| 377 | public override IOperation Apply() {
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| 378 | if (ImproverParameter.ActualValue == null)
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| 379 | return null;
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| 380 | return base.Apply();
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| 381 | }
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| 382 | }
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| 383 | }
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