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 StartTemperatureName = "StartTemperature";
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51 | private const string EndTemperatureName = "EndTemperature";
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52 | private const string TemperatureName = "Temperature";
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53 | private const string ResultsName = "Results";
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54 | private const string MaximizationName = "Maximization";
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55 | private const string QualityName = "Quality";
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56 | private const string BestKnownQualityName = "BestKnownQuality";
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57 | private const string MoveQualityName = "MoveQuality";
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58 | private const string IsAcceptedName = "IsAccepted";
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59 | private const string TerminateName = "Terminate";
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60 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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61 | private const string ReheatCountName = "ReheatCount";
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62 | #endregion
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63 |
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64 | #region Parameter properties
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65 | public IValueLookupParameter<IRandom> RandomParameter
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66 | {
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67 | get { return (IValueLookupParameter<IRandom>)Parameters[RandomName]; }
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68 | }
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69 | public IValueLookupParameter<BoolValue> MaximizationParameter
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70 | {
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71 | get { return (IValueLookupParameter<BoolValue>)Parameters[MaximizationName]; }
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72 | }
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73 | public ILookupParameter<DoubleValue> QualityParameter
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74 | {
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75 | get { return (ILookupParameter<DoubleValue>)Parameters[QualityName]; }
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76 | }
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77 | public IValueLookupParameter<DoubleValue> BestKnownQualityParameter
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78 | {
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79 | get { return (IValueLookupParameter<DoubleValue>)Parameters[BestKnownQualityName]; }
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80 | }
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81 | public ILookupParameter<DoubleValue> MoveQualityParameter
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82 | {
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83 | get { return (ILookupParameter<DoubleValue>)Parameters[MoveQualityName]; }
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84 | }
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85 | public ILookupParameter<DoubleValue> TemperatureParameter
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86 | {
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87 | get { return (ILookupParameter<DoubleValue>)Parameters[TemperatureName]; }
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88 | }
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89 | public IValueLookupParameter<DoubleValue> LowerTemperatureParameter
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90 | {
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91 | get { return (IValueLookupParameter<DoubleValue>)Parameters[LowerTemperatureName]; }
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92 | }
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93 | public ILookupParameter<IntValue> IterationsParameter
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94 | {
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95 | get { return (ILookupParameter<IntValue>)Parameters[IterationsName]; }
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96 | }
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97 | public IValueLookupParameter<IntValue> MaximumIterationsParameter
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98 | {
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99 | get { return (IValueLookupParameter<IntValue>)Parameters[MaximumIterationsName]; }
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100 | }
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101 | public IValueLookupParameter<IOperator> MoveGeneratorParameter
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102 | {
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103 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveGeneratorName]; }
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104 | }
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105 | public IValueLookupParameter<IOperator> MoveEvaluatorParameter
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106 | {
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107 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveEvaluatorName]; }
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108 | }
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109 | public IValueLookupParameter<IOperator> MoveMakerParameter
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110 | {
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111 | get { return (IValueLookupParameter<IOperator>)Parameters[MoveMakerName]; }
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112 | }
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113 | public IValueLookupParameter<IOperator> AnnealingOperatorParameter
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114 | {
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115 | get { return (IValueLookupParameter<IOperator>)Parameters[AnnealingOperatorName]; }
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116 | }
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117 | public IValueLookupParameter<IOperator> ReheatingOperatorParameter
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118 | {
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119 | get { return (IValueLookupParameter<IOperator>)Parameters[ReheatingOperatorName]; }
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120 | }
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121 | public IValueLookupParameter<IOperator> AnalyzerParameter
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122 | {
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123 | get { return (IValueLookupParameter<IOperator>)Parameters[AnalyzerName]; }
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124 | }
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125 | public IValueLookupParameter<VariableCollection> ResultsParameter
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126 | {
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127 | get { return (IValueLookupParameter<VariableCollection>)Parameters[ResultsName]; }
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128 | }
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129 | public ILookupParameter<IntValue> EvaluatedMovesParameter
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130 | {
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131 | get { return (ILookupParameter<IntValue>)Parameters[EvaluatedMovesName]; }
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132 | }
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133 | public ILookupParameter<DoubleValue> StartTemperatureParameter
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134 | {
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135 | get { return (ILookupParameter<DoubleValue>)Parameters[StartTemperatureName]; }
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136 | }
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137 | public ILookupParameter<DoubleValue> EndTemperatureParameter
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138 | {
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139 | get { return (ILookupParameter<DoubleValue>)Parameters[EndTemperatureName]; }
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140 | }
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141 | public ILookupParameter<IntValue> TemperatureStartIndexParameter
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142 | {
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143 | get { return (ILookupParameter<IntValue>)Parameters[TemperatureStartIndexName]; }
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144 | }
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145 | public ILookupParameter<BoolValue> CoolingParameter
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146 | {
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147 | get { return (ILookupParameter<BoolValue>)Parameters[CoolingName]; }
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148 | }
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149 | #endregion
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150 |
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151 | [StorableConstructor]
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152 | private SimulatedAnnealingMainLoop(bool deserializing) : base(deserializing) { }
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153 | private SimulatedAnnealingMainLoop(SimulatedAnnealingMainLoop original, Cloner cloner)
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154 | : base(original, cloner)
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155 | {
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156 | }
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157 | public override IDeepCloneable Clone(Cloner cloner)
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158 | {
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159 | return new SimulatedAnnealingMainLoop(this, cloner);
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160 | }
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161 | public SimulatedAnnealingMainLoop()
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162 | : base()
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163 | {
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164 | Initialize();
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165 | }
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166 |
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167 | private void Initialize()
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168 | {
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169 | #region Create parameters
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170 | Parameters.Add(new ValueLookupParameter<IRandom>(RandomName, "A pseudo random number generator."));
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171 | Parameters.Add(new ValueLookupParameter<BoolValue>(MaximizationName, "True if the problem is a maximization problem, otherwise false."));
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172 | Parameters.Add(new LookupParameter<DoubleValue>(QualityName, "The value which represents the quality of a solution."));
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173 | Parameters.Add(new ValueLookupParameter<DoubleValue>(BestKnownQualityName, "The best known quality value found so far."));
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174 | Parameters.Add(new LookupParameter<DoubleValue>(MoveQualityName, "The value which represents the quality of a move."));
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175 | Parameters.Add(new LookupParameter<DoubleValue>(TemperatureName, "The current temperature."));
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176 | Parameters.Add(new ValueLookupParameter<DoubleValue>(LowerTemperatureName, "The lower bound of the temperature."));
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177 | Parameters.Add(new LookupParameter<IntValue>(IterationsName, "The number of iterations."));
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178 | Parameters.Add(new ValueLookupParameter<IntValue>(MaximumIterationsName, "The maximum number of iterations which should be processed."));
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179 |
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180 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveGeneratorName, "The operator that generates the moves."));
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181 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveEvaluatorName, "The operator that evaluates a move."));
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182 | Parameters.Add(new ValueLookupParameter<IOperator>(MoveMakerName, "The operator that performs a move and updates the quality."));
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183 | Parameters.Add(new ValueLookupParameter<IOperator>(AnnealingOperatorName, "The operator that cools the temperature."));
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184 | Parameters.Add(new ValueLookupParameter<IOperator>(ReheatingOperatorName, "The operator that reheats the temperature if necessary."));
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185 |
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186 | Parameters.Add(new ValueLookupParameter<IOperator>(AnalyzerName, "The operator used to analyze each generation."));
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187 | Parameters.Add(new ValueLookupParameter<VariableCollection>(ResultsName, "The variable collection where results should be stored."));
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188 | Parameters.Add(new LookupParameter<IntValue>(EvaluatedMovesName, "The number of evaluated moves."));
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189 |
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190 | Parameters.Add(new LookupParameter<IntValue>(TemperatureStartIndexName, "The index where the annealing or heating was last changed."));
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191 | Parameters.Add(new LookupParameter<BoolValue>(CoolingName, "True when the temperature should be cooled, false otherwise."));
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192 | Parameters.Add(new LookupParameter<DoubleValue>(StartTemperatureName, "The temperature from which cooling or reheating should occur."));
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193 | Parameters.Add(new LookupParameter<DoubleValue>(EndTemperatureName, "The temperature to which should be cooled or heated."));
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194 | #endregion
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195 |
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196 | #region Create operators
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197 | var variableCreator = new VariableCreator();
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198 | var ssp1 = new SubScopesProcessor();
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199 | var analyzer1 = new Placeholder();
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200 | var ssp2 = new SubScopesProcessor();
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201 | var resultsCollector = new ResultsCollector();
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202 | var mainProcessor = new SubScopesProcessor();
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203 | var moveGenerator = new Placeholder();
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204 | var moveEvaluationProcessor = new SubScopesProcessor();
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205 | var moveEvaluator = new Placeholder();
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206 | var evaluatedMovesCounter = new IntCounter();
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207 | var qualityComparator = new ProbabilisticQualityComparator();
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208 | var acceptsQualityBranch = new ConditionalBranch();
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209 | var moveMaker = new Placeholder();
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210 | var temperatureController = new TemperatureController();
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211 | var subScopesRemover = new SubScopesRemover();
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212 | var iterationsCounter = new IntCounter();
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213 | var iterationsComparator = new Comparator();
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214 | var ssp3 = new SubScopesProcessor();
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215 | var analyzer2 = new Placeholder();
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216 | var iterationsTermination = new ConditionalBranch();
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217 |
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218 | variableCreator.Name = "Initialize Memory";
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219 | variableCreator.CollectedValues.Add(new ValueParameter<ItemList<BoolValue>>(AcceptanceMemoryName, new ItemList<BoolValue>()));
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220 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(ReheatCountName, new IntValue(0)));
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221 |
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222 | analyzer1.Name = "Analyzer";
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223 | analyzer1.OperatorParameter.ActualName = AnalyzerParameter.Name;
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224 |
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225 | moveGenerator.Name = "Move generator";
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226 | moveGenerator.OperatorParameter.ActualName = MoveGeneratorParameter.Name;
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227 |
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228 | moveEvaluator.Name = "Move evaluator";
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229 | moveEvaluator.OperatorParameter.ActualName = MoveEvaluatorParameter.Name;
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230 |
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231 | evaluatedMovesCounter.Name = "EvaluatedMoves++";
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232 | evaluatedMovesCounter.ValueParameter.ActualName = EvaluatedMovesParameter.Name;
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233 | evaluatedMovesCounter.Increment = new IntValue(1);
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234 |
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235 | qualityComparator.LeftSideParameter.ActualName = MoveQualityParameter.Name;
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236 | qualityComparator.RightSideParameter.ActualName = QualityParameter.Name;
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237 | qualityComparator.ResultParameter.ActualName = IsAcceptedName;
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238 | qualityComparator.DampeningParameter.ActualName = TemperatureParameter.Name;
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239 |
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240 | acceptsQualityBranch.ConditionParameter.ActualName = IsAcceptedName;
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241 |
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242 | moveMaker.Name = "Move maker";
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243 | moveMaker.OperatorParameter.ActualName = MoveMakerParameter.Name;
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244 |
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245 |
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246 |
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247 | subScopesRemover.RemoveAllSubScopes = true;
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248 |
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249 | iterationsCounter.Name = "Iterations++";
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250 | iterationsCounter.Increment = new IntValue(1);
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251 | iterationsCounter.ValueParameter.ActualName = IterationsParameter.Name;
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252 |
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253 | iterationsComparator.Name = "Iterations >= MaximumIterations";
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254 | iterationsComparator.LeftSideParameter.ActualName = IterationsParameter.Name;
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255 | iterationsComparator.RightSideParameter.ActualName = MaximumIterationsParameter.Name;
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256 | iterationsComparator.ResultParameter.ActualName = TerminateName;
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257 | iterationsComparator.Comparison.Value = ComparisonType.GreaterOrEqual;
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258 |
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259 | analyzer2.Name = "Analyzer (placeholder)";
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260 | analyzer2.OperatorParameter.ActualName = AnalyzerParameter.Name;
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261 |
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262 | iterationsTermination.Name = "Iterations termination condition";
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263 | iterationsTermination.ConditionParameter.ActualName = TerminateName;
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264 | #endregion
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265 |
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266 | #region Create operator graph
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267 | OperatorGraph.InitialOperator = variableCreator;
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268 | variableCreator.Successor = ssp1;
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269 | ssp1.Operators.Add(analyzer1);
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270 | ssp1.Successor = ssp2;
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271 | analyzer1.Successor = null;
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272 | ssp2.Operators.Add(resultsCollector);
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273 | ssp2.Successor = mainProcessor;
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274 | resultsCollector.Successor = null;
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275 | mainProcessor.Operators.Add(moveGenerator);
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276 | mainProcessor.Successor = iterationsCounter;
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277 | moveGenerator.Successor = moveEvaluationProcessor;
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278 | moveEvaluationProcessor.Operators.Add(moveEvaluator);
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279 | moveEvaluationProcessor.Successor = evaluatedMovesCounter;
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280 | moveEvaluator.Successor = qualityComparator;
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281 | qualityComparator.Successor = acceptsQualityBranch;
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282 | acceptsQualityBranch.TrueBranch = moveMaker;
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283 | acceptsQualityBranch.FalseBranch = null;
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284 | acceptsQualityBranch.Successor = temperatureController;
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285 | moveMaker.Successor = null;
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286 | temperatureController.Successor = null;
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287 | evaluatedMovesCounter.Successor = subScopesRemover;
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288 | subScopesRemover.Successor = null;
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289 | iterationsCounter.Successor = iterationsComparator;
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290 | iterationsComparator.Successor = ssp3;
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291 | ssp3.Operators.Add(analyzer2);
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292 | ssp3.Successor = iterationsTermination;
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293 | iterationsTermination.TrueBranch = null;
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294 | iterationsTermination.FalseBranch = mainProcessor;
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295 | #endregion
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296 | }
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297 |
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298 | public override IOperation Apply()
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299 | {
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300 | if (MoveGeneratorParameter.ActualValue == null || MoveEvaluatorParameter.ActualValue == null || MoveMakerParameter.ActualValue == null)
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301 | return null;
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302 | return base.Apply();
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303 | }
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304 | }
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305 | }
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