1 | #region License Information
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2 |
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3 | /* HeuristicLab
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4 | * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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5 | *
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6 | * This file is part of HeuristicLab.
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7 | *
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8 | * HeuristicLab is free software: you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation, either version 3 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * HeuristicLab is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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20 | */
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21 |
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22 | #endregion
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23 |
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24 | using System;
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25 | using System.Linq;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Data;
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29 | using HeuristicLab.Operators;
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30 | using HeuristicLab.Parameters;
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31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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32 | using HeuristicLab.Optimization;
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33 |
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34 | namespace HeuristicLab.Algorithms.SimulatedAnnealing
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35 | {
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36 | [Item("TemperatureController", "Decides based on information from the heatingoperator, whether to use cooling or heating and calls the appropriate operator.")]
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37 | [StorableClass]
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38 | public class TemperatureController : SingleSuccessorOperator
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39 | {
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40 | #region Strings
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41 | private const string ReheatingOperatorName = "ReheatingOperator";
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42 | private const string AnnealingOperatorName = "AnnealingOperator";
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43 | private const string MaximumIterationsName = "MaximumIterations";
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44 | private const string InitialTemperatureName = "InitialTemperature";
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45 | private const string LowerTemperatureName = "LowerTemperature";
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46 | private const string IterationsName = "Iterations";
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47 | private const string TemperatureStartIndexName = "TemperatureStartIndex";
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48 | private const string CoolingName = "Cooling";
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49 | private const string StartTemperatureName = "StartTemperature";
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50 | private const string EndTemperatureName = "EndTemperature";
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51 | private const string TemperatureName = "Temperature";
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52 | private const string IsAcceptedName = "IsAccepted";
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53 | private const string ConsecutiveRejectedSolutionsCountName = "ConsecutiveRejectedSolutions";
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54 | private const string AverageAcceptanceRatioName = "AverageAcceptanceRatio";
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55 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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56 | private const string LastQualityName = "LastQuality";
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57 | private const string UphillMovesMemoryName = "UphillMovesMemory";
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58 | private const string MaximizationName = "Maximization";
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59 | private const string MoveQualityName = "MoveQuality";
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60 | private const string InitialAcceptanceRateName = "InitialAcceptanceRate";
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61 | private const string ResultsName = "Results";
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62 | private const string CalculatedInitialTemperatureName = "CalculatedInitialTemperature";
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63 |
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64 | #endregion
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65 |
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66 | #region Parameter Properties
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67 | public ILookupParameter<DoubleValue> TemperatureParameter
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68 | {
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69 | get { return (ILookupParameter<DoubleValue>)Parameters[TemperatureName]; }
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70 | }
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71 | public ILookupParameter<DoubleValue> InitialTemperatureParameter
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72 | {
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73 | get { return (ILookupParameter<DoubleValue>)Parameters[InitialTemperatureName]; }
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74 | }
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75 | public IValueLookupParameter<DoubleValue> LowerTemperatureParameter
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76 | {
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77 | get { return (IValueLookupParameter<DoubleValue>)Parameters[LowerTemperatureName]; }
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78 | }
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79 | public ILookupParameter<DoubleValue> StartTemperatureParameter
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80 | {
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81 | get { return (ILookupParameter<DoubleValue>)Parameters[StartTemperatureName]; }
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82 | }
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83 | public ILookupParameter<DoubleValue> EndTemperatureParameter
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84 | {
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85 | get { return (ILookupParameter<DoubleValue>)Parameters[EndTemperatureName]; }
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86 | }
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87 | public ILookupParameter<IntValue> TemperatureStartIndexParameter
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88 | {
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89 | get { return (ILookupParameter<IntValue>)Parameters[TemperatureStartIndexName]; }
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90 | }
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91 | public ILookupParameter<BoolValue> CoolingParameter
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92 | {
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93 | get { return (ILookupParameter<BoolValue>)Parameters[CoolingName]; }
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94 | }
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95 | public ILookupParameter<IntValue> IterationsParameter
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96 | {
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97 | get { return (ILookupParameter<IntValue>)Parameters[IterationsName]; }
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98 | }
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99 | public IValueLookupParameter<IntValue> MaximumIterationsParameter
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100 | {
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101 | get { return (IValueLookupParameter<IntValue>)Parameters[MaximumIterationsName]; }
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102 | }
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103 | public IValueLookupParameter<IOperator> AnnealingOperatorParameter
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104 | {
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105 | get { return (IValueLookupParameter<IOperator>)Parameters[AnnealingOperatorName]; }
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106 | }
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107 | public IValueLookupParameter<IReheatingOperator> ReheatingOperatorParameter
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108 | {
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109 | get { return (IValueLookupParameter<IReheatingOperator>)Parameters[ReheatingOperatorName]; }
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110 | }
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111 | public ILookupParameter<BoolValue> IsAcceptedParameter
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112 | {
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113 | get { return (ILookupParameter<BoolValue>)Parameters[IsAcceptedName]; }
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114 | }
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115 | public ILookupParameter<ItemList<BoolValue>> AcceptanceMemoryParameter
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116 | {
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117 | get { return (ILookupParameter<ItemList<BoolValue>>)Parameters[AcceptanceMemoryName]; }
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118 | }
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119 | public ILookupParameter<ItemList<DoubleValue>> UphillMovesMemoryParameter
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120 | {
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121 | get { return (ILookupParameter<ItemList<DoubleValue>>)Parameters[UphillMovesMemoryName]; }
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122 | }
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123 | public ILookupParameter<DoubleValue> MoveQualityParameter
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124 | {
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125 | get { return (ILookupParameter<DoubleValue>)Parameters[MoveQualityName]; }
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126 | }
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127 | public ILookupParameter<DoubleValue> LastQualityParameter
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128 | {
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129 | get { return (ILookupParameter<DoubleValue>)Parameters[LastQualityName]; }
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130 | }
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131 | public IValueLookupParameter<BoolValue> MaximizationParameter
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132 | {
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133 | get { return (IValueLookupParameter<BoolValue>)Parameters[MaximizationName]; }
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134 | }
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135 | public ILookupParameter<DoubleValue> InitialAcceptanceRateParameter
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136 | {
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137 | get { return (ILookupParameter<DoubleValue>)Parameters[InitialAcceptanceRateName]; }
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138 | }
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139 | public ILookupParameter<IntValue> ConsecutiveRejectedSolutionsCountParameter
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140 | {
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141 | get { return (ILookupParameter<IntValue>)Parameters[ConsecutiveRejectedSolutionsCountName]; }
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142 | }
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143 | public ILookupParameter<DoubleValue> AverageAcceptanceRatioParameter
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144 | {
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145 | get { return (ILookupParameter<DoubleValue>)Parameters[AverageAcceptanceRatioName]; }
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146 | }
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147 | #endregion
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148 |
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149 | [StorableConstructor]
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150 | protected TemperatureController(bool deserializing) : base(deserializing) { }
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151 | protected TemperatureController(TemperatureController original, Cloner cloner) : base(original, cloner) { }
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152 | public TemperatureController()
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153 | : base()
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154 | {
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155 | Parameters.Add(new LookupParameter<DoubleValue>(TemperatureName, "The current temperature."));
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156 | Parameters.Add(new ValueLookupParameter<DoubleValue>(LowerTemperatureName, "The lower bound of the temperature."));
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157 | Parameters.Add(new LookupParameter<IntValue>(IterationsName, "The number of iterations."));
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158 | Parameters.Add(new ValueLookupParameter<IntValue>(MaximumIterationsName, "The maximum number of iterations which should be processed."));
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159 | Parameters.Add(new ValueLookupParameter<BoolValue>(MaximizationName, "True if the problem is a maximization problem, otherwise false."));
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160 | Parameters.Add(new ValueLookupParameter<IOperator>(AnnealingOperatorName, "The operator that cools the temperature."));
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161 | Parameters.Add(new ValueLookupParameter<IReheatingOperator>(ReheatingOperatorName, "The operator that reheats the temperature if necessary."));
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162 | Parameters.Add(new LookupParameter<IntValue>(TemperatureStartIndexName, "The index where the annealing or heating was last changed."));
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163 | Parameters.Add(new LookupParameter<BoolValue>(CoolingName, "True when the temperature should be cooled, false otherwise."));
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164 | Parameters.Add(new LookupParameter<DoubleValue>(StartTemperatureName, "The temperature from which cooling or reheating should occur."));
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165 | Parameters.Add(new LookupParameter<DoubleValue>(EndTemperatureName, "The temperature to which should be cooled or heated."));
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166 | Parameters.Add(new LookupParameter<BoolValue>(IsAcceptedName, "Whether the move was accepted or not."));
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167 | Parameters.Add(new LookupParameter<ItemList<BoolValue>>(AcceptanceMemoryName, "Memorizes the last N acceptance decisions."));
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168 | Parameters.Add(new LookupParameter<DoubleValue>(InitialTemperatureName, "The initial temperature."));
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169 |
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170 | Parameters.Add(new LookupParameter<ItemList<DoubleValue>>(UphillMovesMemoryName, "Memorizes the last 100 uphill moves."));
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171 | Parameters.Add(new LookupParameter<DoubleValue>(MoveQualityName, "The value which represents the quality of a move."));
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172 | Parameters.Add(new LookupParameter<DoubleValue>(LastQualityName, "The value which represents the quality of the last move."));
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173 | Parameters.Add(new LookupParameter<DoubleValue>(InitialAcceptanceRateName, "The initial acceptance rate of average-sized hills used to calculate the initial temperature."));
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174 | Parameters.Add(new LookupParameter<IntValue>(ConsecutiveRejectedSolutionsCountName, "Amount of consecutive rejected solutions."));
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175 | Parameters.Add(new LookupParameter<DoubleValue>(AverageAcceptanceRatioName, "Average acceptance over full acceptance memory."));
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176 |
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177 | }
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178 |
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179 | public override IDeepCloneable Clone(Cloner cloner)
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180 | {
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181 | return new TemperatureController(this, cloner);
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182 | }
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183 |
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184 | public override IOperation Apply()
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185 | {
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186 | var uphillMoves = UphillMovesMemoryParameter.ActualValue;
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187 | if (!InitialTemperatureFound())
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188 | {
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189 | return findInitialTemperature();
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190 | }else
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191 | {
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192 | return new OperationCollection {
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193 | ExecutionContext.CreateOperation(ReheatingOperatorParameter.ActualValue),
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194 | base.Apply()
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195 | };
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196 | }
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197 | }
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198 |
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199 | private IOperation findInitialTemperature()
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200 | {
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201 | var currentQuality = MoveQualityParameter.ActualValue.Value;
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202 | var lastQuality = LastQualityParameter.ActualValue.Value;
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203 | var isMaximation = MaximizationParameter.ActualValue.Value;
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204 | var hillMemory = UphillMovesMemoryParameter.ActualValue;
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205 |
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206 | if(lastQuality != -1)
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207 | {
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208 | double hillSize = CalculateHillSize(lastQuality, currentQuality, isMaximation);
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209 |
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210 | if(hillSize > 0)
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211 | {
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212 | hillMemory.Add(new DoubleValue(hillSize));
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213 | if(InitialTemperatureFound())
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214 | {
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215 | var results = (ResultCollection)ExecutionContext.Parent.Scope.Variables[ResultsName].Value;
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216 | var initialTemperature = CalculateInitialTemperatureBasedOnAverageHillSize(hillMemory);
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217 | InitialTemperatureParameter.ActualValue.Value = initialTemperature;
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218 | TemperatureParameter.ActualValue.Value = initialTemperature;
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219 | TemperatureStartIndexParameter.ActualValue.Value = Math.Max(0, IterationsParameter.ActualValue.Value - 1);
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220 | StartTemperatureParameter.ActualValue.Value = TemperatureParameter.ActualValue.Value;
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221 | results.Add(new Result(CalculatedInitialTemperatureName, new DoubleValue(initialTemperature)));
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222 | }
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223 | }
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224 | }
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225 |
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226 | LastQualityParameter.ActualValue.Value = currentQuality;
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227 | return base.Apply();
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228 | }
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229 |
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230 | private double CalculateInitialTemperatureBasedOnAverageHillSize(ItemList<DoubleValue> hillMemory)
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231 | {
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232 | var averageHillSize = hillMemory.Average(x => x.Value);
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233 | return -(averageHillSize / Math.Log(InitialAcceptanceRateParameter.ActualValue.Value));
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234 |
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235 | }
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236 |
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237 | private double CalculateHillSize(double lastQuality, double currentQuality, bool isMaximation)
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238 | {
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239 | return isMaximation ? lastQuality - currentQuality : currentQuality - lastQuality;
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240 | }
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241 |
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242 | private bool InitialTemperatureFound()
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243 | {
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244 | return UphillMovesMemoryParameter.ActualValue.Count == 100;
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245 | }
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246 | }
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247 | } |
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