| 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using 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.Operators;
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| 27 | using HeuristicLab.Parameters;
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| 28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 29 |
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| 30 | namespace HeuristicLab.Algorithms.SimulatedAnnealing
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| 31 | {
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| 32 | [Item("SimulatedAnnealingMainLoop", "An operator which represents the main loop of a simulated annealing algorithm.")]
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| 33 | [StorableClass]
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| 34 | public sealed class SimulatedAnnealingMainLoop : AlgorithmOperator
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| 35 | {
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| 36 | #region Strings
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| 37 | private const string MoveGeneratorName = "MoveGenerator";
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| 38 | private const string MoveEvaluatorName = "MoveEvaluator";
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| 39 | private const string MoveMakerName = "MoveMaker";
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| 40 | private const string AnnealingOperatorName = "AnnealingOperator";
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| 41 | private const string ReheatingOperatorName = "ReheatingOperator";
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| 42 | private const string MaximumIterationsName = "MaximumIterations";
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| 43 | private const string LowerTemperatureName = "LowerTemperature";
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| 44 | private const string AnalyzerName = "Analyzer";
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| 45 | private const string RandomName = "Random";
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| 46 | private const string EvaluatedMovesName = "EvaluatedMoves";
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| 47 | private const string IterationsName = "Iterations";
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| 48 | private const string TemperatureStartIndexName = "TemperatureStartIndex";
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| 49 | private const string CoolingName = "Cooling";
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| 50 | private const string InitialTemperatureName = "InitialTemperature";
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| 51 | private const string StartTemperatureName = "StartTemperature";
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| 52 | private const string EndTemperatureName = "EndTemperature";
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| 53 | private const string TemperatureName = "Temperature";
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| 54 | private const string ResultsName = "Results";
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| 55 | private const string MaximizationName = "Maximization";
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| 56 | private const string QualityName = "Quality";
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| 57 | private const string BestKnownQualityName = "BestKnownQuality";
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| 58 | private const string MoveQualityName = "MoveQuality";
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| 59 | private const string IsAcceptedName = "IsAccepted";
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| 60 | private const string TerminateName = "Terminate";
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| 61 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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| 62 | private const string ConsecutiveRejectedSolutionsCountName = "ConsecutiveRejectedSolutions";
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| 63 | private const string AverageAcceptanceRatioName = "AverageAcceptanceRatio";
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| 64 | private const string LastQualityName = "LastQuality";
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| 65 | private const string UphillMovesMemoryName = "UphillMovesMemory";
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| 66 | private const string TemperatureBeforeReheatName = "TemperatureBeforeReheat";
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| 67 | private const string CurrentRandomWalkStepName = "CurrentRandomWalkStep";
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| 68 | private const string QualitiesBeforeReheatingName = "QualitiesBeforeReheating";
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| 69 | private const string LastAcceptedQualityName = "LastAcceptedQuality";
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| 70 | private const string TemperatureInitializerName = "TemperatureInitializer";
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| 71 | private const string TemperatureInitializedName = "TemperatureInitialized";
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| 72 |
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| 73 | #endregion
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| 74 |
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| 75 | #region Parameter properties
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| 76 | public IValueLookupParameter<IRandom> RandomParameter
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| 77 | {
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| 78 | get { return (IValueLookupParameter<IRandom>)Parameters[RandomName]; }
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| 79 | }
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| 80 | public IValueLookupParameter<BoolValue> MaximizationParameter
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| 81 | {
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| 82 | get { return (IValueLookupParameter<BoolValue>)Parameters[MaximizationName]; }
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| 83 | }
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| 84 | public ILookupParameter<DoubleValue> QualityParameter
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| 85 | {
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| 86 | get { return (ILookupParameter<DoubleValue>)Parameters[QualityName]; }
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| 87 | }
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| 88 | public IValueLookupParameter<DoubleValue> BestKnownQualityParameter
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| 89 | {
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| 90 | get { return (IValueLookupParameter<DoubleValue>)Parameters[BestKnownQualityName]; }
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| 91 | }
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| 92 | public IValueLookupParameter<DoubleValue> LastQualityParameter
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| 93 | {
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| 94 | get { return (IValueLookupParameter<DoubleValue>)Parameters[LastQualityName]; }
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| 95 | }
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| 96 | public ILookupParameter<DoubleValue> InitialTemperatureParameter
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| 97 | {
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| 98 | get { return (ILookupParameter<DoubleValue>)Parameters[InitialTemperatureName]; }
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| 99 | }
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| 100 | public ILookupParameter<DoubleValue> MoveQualityParameter
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| 101 | {
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| 102 | get { return (ILookupParameter<DoubleValue>)Parameters[MoveQualityName]; }
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| 103 | }
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| 104 | public ILookupParameter<DoubleValue> TemperatureParameter
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| 105 | {
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| 106 | get { return (ILookupParameter<DoubleValue>)Parameters[TemperatureName]; }
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| 107 | }
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| 108 | public IValueLookupParameter<DoubleValue> LowerTemperatureParameter
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| 109 | {
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| 110 | get { return (IValueLookupParameter<DoubleValue>)Parameters[LowerTemperatureName]; }
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| 111 | }
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| 112 | public ILookupParameter<IntValue> IterationsParameter
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| 113 | {
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| 114 | get { return (ILookupParameter<IntValue>)Parameters[IterationsName]; }
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| 115 | }
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| 116 | public IValueLookupParameter<IntValue> MaximumIterationsParameter
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| 117 | {
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| 118 | get { return (IValueLookupParameter<IntValue>)Parameters[MaximumIterationsName]; }
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| 119 | }
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| 120 | public IValueLookupParameter<IOperator> MoveGeneratorParameter
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| 121 | {
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| 122 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveGeneratorName]; }
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| 123 | }
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| 124 | public IValueLookupParameter<IOperator> MoveEvaluatorParameter
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| 125 | {
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| 126 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveEvaluatorName]; }
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| 127 | }
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| 128 | public IValueLookupParameter<IOperator> MoveMakerParameter
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| 129 | {
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| 130 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveMakerName]; }
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| 131 | }
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| 132 | public IValueLookupParameter<IOperator> AnnealingOperatorParameter
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| 133 | {
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| 134 | get { return (IValueLookupParameter<IOperator>)Parameters[AnnealingOperatorName]; }
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| 135 | }
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| 136 | public IValueLookupParameter<IOperator> ReheatingOperatorParameter
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| 137 | {
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| 138 | get { return (IValueLookupParameter<IOperator>)Parameters[ReheatingOperatorName]; }
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| 139 | }
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| 140 | public IValueLookupParameter<IOperator> AnalyzerParameter
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| 141 | {
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| 142 | get { return (IValueLookupParameter<IOperator>)Parameters[AnalyzerName]; }
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| 143 | }
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| 144 | public IValueLookupParameter<VariableCollection> ResultsParameter
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| 145 | {
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| 146 | get { return (IValueLookupParameter<VariableCollection>)Parameters[ResultsName]; }
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| 147 | }
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| 148 | public ILookupParameter<IntValue> EvaluatedMovesParameter
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| 149 | {
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| 150 | get { return (ILookupParameter<IntValue>)Parameters[EvaluatedMovesName]; }
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| 151 | }
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| 152 | public ILookupParameter<DoubleValue> StartTemperatureParameter
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| 153 | {
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| 154 | get { return (ILookupParameter<DoubleValue>)Parameters[StartTemperatureName]; }
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| 155 | }
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| 156 | public ILookupParameter<DoubleValue> EndTemperatureParameter
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| 157 | {
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| 158 | get { return (ILookupParameter<DoubleValue>)Parameters[EndTemperatureName]; }
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| 159 | }
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| 160 | public ILookupParameter<IntValue> TemperatureStartIndexParameter
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| 161 | {
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| 162 | get { return (ILookupParameter<IntValue>)Parameters[TemperatureStartIndexName]; }
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| 163 | }
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| 164 | public ILookupParameter<BoolValue> CoolingParameter
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| 165 | {
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| 166 | get { return (ILookupParameter<BoolValue>)Parameters[CoolingName]; }
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| 167 | }
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| 168 | #endregion
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| 169 |
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| 170 | [StorableConstructor]
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| 171 | private SimulatedAnnealingMainLoop(bool deserializing) : base(deserializing) { }
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| 172 | private SimulatedAnnealingMainLoop(SimulatedAnnealingMainLoop original, Cloner cloner)
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| 173 | : base(original, cloner)
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| 174 | {
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| 175 | }
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| 176 | public override IDeepCloneable Clone(Cloner cloner)
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| 177 | {
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| 178 | return new SimulatedAnnealingMainLoop(this, cloner);
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| 179 | }
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| 180 | public SimulatedAnnealingMainLoop()
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| 181 | : base()
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| 182 | {
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| 183 | Initialize();
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| 184 | }
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| 185 |
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| 186 | private void Initialize()
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| 187 | {
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| 188 | #region Create parameters
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| 189 | Parameters.Add(new ValueLookupParameter<IRandom>(RandomName, "A pseudo random number generator."));
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| 190 | Parameters.Add(new ValueLookupParameter<BoolValue>(MaximizationName, "True if the problem is a maximization problem, otherwise false."));
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| 191 | Parameters.Add(new LookupParameter<DoubleValue>(QualityName, "The value which represents the quality of a solution."));
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| 192 | Parameters.Add(new ValueLookupParameter<DoubleValue>(BestKnownQualityName, "The best known quality value found so far."));
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| 193 | Parameters.Add(new LookupParameter<DoubleValue>(MoveQualityName, "The value which represents the quality of a move."));
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| 194 | Parameters.Add(new LookupParameter<DoubleValue>(TemperatureName, "The current temperature."));
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| 195 | Parameters.Add(new ValueLookupParameter<DoubleValue>(LowerTemperatureName, "The lower bound of the temperature."));
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| 196 | Parameters.Add(new LookupParameter<IntValue>(IterationsName, "The number of iterations."));
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| 197 | Parameters.Add(new ValueLookupParameter<IntValue>(MaximumIterationsName, "The maximum number of iterations which should be processed."));
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| 198 |
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| 199 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveGeneratorName, "The operator that generates the moves."));
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| 200 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveEvaluatorName, "The operator that evaluates a move."));
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| 201 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveMakerName, "The operator that performs a move and updates the quality."));
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| 202 | Parameters.Add(new ValueLookupParameter<IOperator>(AnnealingOperatorName, "The operator that cools the temperature."));
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| 203 | Parameters.Add(new ValueLookupParameter<IOperator>(ReheatingOperatorName, "The operator that reheats the temperature if necessary."));
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| 204 | Parameters.Add(new ValueLookupParameter<IOperator>(TemperatureInitializerName, "The operator that initialized the temperature."));
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| 205 |
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| 206 | Parameters.Add(new ValueLookupParameter<IOperator>(AnalyzerName, "The operator used to analyze each generation."));
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| 207 | Parameters.Add(new ValueLookupParameter<VariableCollection>(ResultsName, "The variable collection where results should be stored."));
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| 208 | Parameters.Add(new LookupParameter<IntValue>(EvaluatedMovesName, "The number of evaluated moves."));
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| 209 |
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| 210 | Parameters.Add(new LookupParameter<DoubleValue>(InitialTemperatureName, "The initial temperature."));
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| 211 | Parameters.Add(new LookupParameter<IntValue>(TemperatureStartIndexName, "The index where the annealing or heating was last changed."));
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| 212 | Parameters.Add(new LookupParameter<BoolValue>(CoolingName, "True when the temperature should be cooled, false otherwise."));
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| 213 | Parameters.Add(new LookupParameter<DoubleValue>(StartTemperatureName, "The temperature from which cooling or reheating should occur."));
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| 214 | Parameters.Add(new LookupParameter<DoubleValue>(EndTemperatureName, "The temperature to which should be cooled or heated."));
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| 215 |
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| 216 |
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| 217 | #endregion
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| 218 |
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| 219 | #region Create operators
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| 220 | var variableCreator = new VariableCreator();
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| 221 | var ssp1 = new SubScopesProcessor();
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| 222 | var analyzer1 = new Placeholder();
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| 223 | var ssp2 = new SubScopesProcessor();
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| 224 | var resultsCollector = new ResultsCollector();
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| 225 | var mainProcessor = new SubScopesProcessor();
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| 226 | var moveGenerator = new Placeholder();
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| 227 | var moveEvaluationProcessor = new SubScopesProcessor();
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| 228 | var moveEvaluator = new Placeholder();
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| 229 | var evaluatedMovesCounter = new IntCounter();
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| 230 | var qualityComparator = new ProbabilisticQualityComparator();
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| 231 | var acceptsQualityBranch = new ConditionalBranch();
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| 232 | var moveMaker = new Placeholder();
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| 233 | var temperatureController = new TemperatureController();
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| 234 | var subScopesRemover = new SubScopesRemover();
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| 235 | var iterationsCounter = new IntCounter();
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| 236 | var iterationsComparator = new Comparator();
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| 237 | var ssp3 = new SubScopesProcessor();
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| 238 | var analyzer2 = new Placeholder();
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| 239 | var iterationsTermination = new ConditionalBranch();
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| 240 |
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| 241 | variableCreator.Name = "Initialize Memory";
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| 242 | variableCreator.CollectedValues.Add(new ValueParameter<BoolValue>(TemperatureInitializedName, new BoolValue(false)));
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| 243 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(AverageAcceptanceRatioName, new DoubleValue(0d)));
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| 244 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(ConsecutiveRejectedSolutionsCountName, new IntValue(0)));
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| 245 | variableCreator.CollectedValues.Add(new ValueParameter<ItemList<BoolValue>>(AcceptanceMemoryName, new ItemList<BoolValue>()));
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| 246 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(LastQualityName, new DoubleValue(-1)));
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| 247 | variableCreator.CollectedValues.Add(new ValueParameter<ItemList<DoubleValue>>(UphillMovesMemoryName, new ItemList<DoubleValue>()));
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| 248 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(CurrentRandomWalkStepName, new IntValue(0)));
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| 249 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(TemperatureBeforeReheatName, new DoubleValue(0)));
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| 250 | variableCreator.CollectedValues.Add(new ValueParameter<ItemList<DoubleValue>>(QualitiesBeforeReheatingName, new ItemList<DoubleValue>()));
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| 251 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(LastAcceptedQualityName, new DoubleValue(-1)));
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| 252 |
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| 253 | analyzer1.Name = "Analyzer";
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| 254 | analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
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| 255 |
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| 256 | moveGenerator.Name = "Move generator";
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| 257 | moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
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| 258 |
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| 259 | moveEvaluator.Name = "Move evaluator";
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| 260 | moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 261 |
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| 262 | evaluatedMovesCounter.Name = "EvaluatedMoves++";
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| 263 | evaluatedMovesCounter.ValueParameter.ActualName = EvaluatedMovesParameter.Name;
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| 264 | evaluatedMovesCounter.Increment = new IntValue(1);
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| 265 |
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| 266 | qualityComparator.LeftSideParameter.ActualName = MoveQualityParameter.Name;
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| 267 | qualityComparator.RightSideParameter.ActualName = QualityParameter.Name;
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| 268 | qualityComparator.ResultParameter.ActualName = IsAcceptedName;
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| 269 | qualityComparator.DampeningParameter.ActualName = TemperatureParameter.Name;
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| 270 |
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| 271 | acceptsQualityBranch.ConditionParameter.ActualName = IsAcceptedName;
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| 272 |
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| 273 | moveMaker.Name = "Move maker";
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| 274 | moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
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| 275 |
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| 276 |
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| 277 | subScopesRemover.RemoveAllSubScopes = true;
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| 278 |
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| 279 | iterationsCounter.Name = "Iterations++";
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| 280 | iterationsCounter.Increment = new IntValue(1);
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| 281 | iterationsCounter.ValueParameter.ActualName = IterationsParameter.Name;
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| 282 |
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| 283 | iterationsComparator.Name = "Iterations >= MaximumIterations";
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| 284 | iterationsComparator.LeftSideParameter.ActualName = IterationsParameter.Name;
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| 285 | iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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| 286 | iterationsComparator.ResultParameter.ActualName = TerminateName;
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| 287 | iterationsComparator.Comparison.Value = ComparisonType.GreaterOrEqual;
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| 288 |
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| 289 | analyzer2.Name = "Analyzer (placeholder)";
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| 290 | analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
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| 291 |
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| 292 | iterationsTermination.Name = "Iterations termination condition";
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| 293 | iterationsTermination.ConditionParameter.ActualName = TerminateName;
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| 294 | #endregion
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| 295 |
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| 296 | #region Create operator graph
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| 297 | OperatorGraph.InitialOperator = variableCreator;
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| 298 | variableCreator.Successor = ssp1;
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| 299 | ssp1.Operators.Add(analyzer1);
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| 300 | ssp1.Successor = ssp2;
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| 301 | analyzer1.Successor = null;
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| 302 | ssp2.Operators.Add(resultsCollector);
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| 303 | ssp2.Successor = mainProcessor;
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| 304 | resultsCollector.Successor = null;
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| 305 | mainProcessor.Operators.Add(moveGenerator);
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| 306 | mainProcessor.Successor = iterationsCounter;
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| 307 | moveGenerator.Successor = moveEvaluationProcessor;
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| 308 | moveEvaluationProcessor.Operators.Add(moveEvaluator);
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| 309 | moveEvaluationProcessor.Successor = evaluatedMovesCounter;
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| 310 | moveEvaluator.Successor = qualityComparator;
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| 311 | qualityComparator.Successor = acceptsQualityBranch;
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| 312 | acceptsQualityBranch.TrueBranch = moveMaker;
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| 313 | acceptsQualityBranch.FalseBranch = null;
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| 314 | acceptsQualityBranch.Successor = temperatureController;
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| 315 | moveMaker.Successor = null;
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| 316 | temperatureController.Successor = null;
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| 317 | evaluatedMovesCounter.Successor = subScopesRemover;
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| 318 | subScopesRemover.Successor = null;
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| 319 | iterationsCounter.Successor = iterationsComparator;
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| 320 | iterationsComparator.Successor = ssp3;
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| 321 | ssp3.Operators.Add(analyzer2);
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| 322 | ssp3.Successor = iterationsTermination;
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| 323 | iterationsTermination.TrueBranch = null;
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| 324 | iterationsTermination.FalseBranch = mainProcessor;
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| 325 | #endregion
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| 326 | }
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| 327 |
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| 328 | public override IOperation Apply()
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| 329 | {
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| 330 | if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null)
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| 331 | return null;
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| 332 | return base.Apply();
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| 333 | }
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| 334 | }
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| 335 | }
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