1 | using HeuristicLab.Operators;
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2 | using System;
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3 | using System.Collections.Generic;
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4 | using System.Linq;
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5 | using System.Text;
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6 | using System.Threading.Tasks;
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7 | using HeuristicLab.Common;
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8 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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9 | using HeuristicLab.Core;
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10 | using HeuristicLab.Data;
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11 | using HeuristicLab.Parameters;
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12 | using HeuristicLab.Optimization;
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13 | using HeuristicLab.PluginInfrastructure;
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14 | using HeuristicLab.Analysis;
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15 |
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16 | namespace HeuristicLab.Algorithms.SimulatedAnnealing
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17 | {
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18 | [Item("ConnollyReheatingOperator", "Reheats the temperature only once after N consecutive solutions are rejected. It reheats to the temperature where the best solutions was found and the temperature stays there.")]
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19 | [StorableClass]
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20 | public class ConnollyReheatingOperator : SingleSuccessorOperator, IReheatingOperator
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21 | {
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22 | #region Strings
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23 | private const string AnnealingOperatorName = "AnnealingOperator";
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24 | private const string LowerTemperatureName = "LowerTemperature";
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25 | private const string IterationsName = "Iterations";
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26 | private const string TemperatureStartIndexName = "TemperatureStartIndex";
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27 | private const string StartTemperatureName = "StartTemperature";
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28 | private const string EndTemperatureName = "EndTemperature";
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29 | private const string TemperatureName = "Temperature";
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30 | private const string MaximumIterationsName = "MaximumIterations";
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31 |
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32 | private const string ThresholdName = "Threshold";
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33 | private const string IdealTemperatureName = "IdealTemperature";
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34 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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35 | private const string IsAcceptedName = "IsAccepted";
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36 | private const string QualityName = "Quality";
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37 | private const string CoolingName = "Cooling";
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38 | private const string ResultsName = "Results";
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39 |
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40 | private const string BestQualityName = "BestQuality";
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41 | private const string TemperatureChartName = "Temperature Chart";
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42 | private const string QualitiesName = "Qualities";
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43 | private const string OptimalTemperatureName = "Optimal Temperature";
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44 |
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45 | #endregion
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46 | #region Parameters
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47 | public ILookupParameter<DoubleValue> TemperatureParameter
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48 | {
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49 | get { return (ILookupParameter<DoubleValue>)Parameters[TemperatureName]; }
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50 | }
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51 | public ILookupParameter<DoubleValue> LowerTemperatureParameter
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52 | {
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53 | get { return (ILookupParameter<DoubleValue>)Parameters[LowerTemperatureName]; }
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54 | }
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55 | public ILookupParameter<DoubleValue> StartTemperatureParameter
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56 | {
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57 | get { return (ILookupParameter<DoubleValue>)Parameters[StartTemperatureName]; }
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58 | }
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59 | public ILookupParameter<DoubleValue> EndTemperatureParameter
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60 | {
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61 | get { return (ILookupParameter<DoubleValue>)Parameters[EndTemperatureName]; }
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62 | }
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63 | public ILookupParameter<IntValue> TemperatureStartIndexParameter
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64 | {
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65 | get { return (ILookupParameter<IntValue>)Parameters[TemperatureStartIndexName]; }
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66 | }
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67 | public ILookupParameter<IntValue> IterationsParameter
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68 | {
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69 | get { return (ILookupParameter<IntValue>)Parameters[IterationsName]; }
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70 | }
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71 | public ILookupParameter<IDiscreteDoubleValueModifier> AnnealingOperatorParameter
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72 | {
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73 | get { return (ILookupParameter<IDiscreteDoubleValueModifier>)Parameters[AnnealingOperatorName]; }
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74 | }
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75 | public ILookupParameter<IntValue> MaximumIterationsParameter
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76 | {
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77 | get { return (ILookupParameter<IntValue>)Parameters[MaximumIterationsName]; }
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78 | }
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79 | private ValueParameter<IntValue> ThresholdParameter
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80 | {
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81 | get { return (ValueParameter<IntValue>)Parameters[ThresholdName]; }
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82 | }
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83 | public ILookupParameter<BoolValue> IsAcceptedParameter
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84 | {
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85 | get { return (ILookupParameter<BoolValue>)Parameters[IsAcceptedName]; }
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86 | }
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87 | public ILookupParameter<ItemList<BoolValue>> AcceptanceMemoryParameter
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88 | {
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89 | get { return (ILookupParameter<ItemList<BoolValue>>)Parameters[AcceptanceMemoryName]; }
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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 |
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96 | #endregion
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97 |
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98 | public ConnollyReheatingOperator() : base()
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99 | {
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100 | #region Create parameters
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101 | Parameters.Add(new LookupParameter<DoubleValue>(TemperatureName, "The current temperature."));
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102 | Parameters.Add(new LookupParameter<DoubleValue>(LowerTemperatureName, "The lower bound of the temperature."));
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103 | Parameters.Add(new LookupParameter<IntValue>(IterationsName, "The number of iterations."));
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104 | Parameters.Add(new LookupParameter<IDiscreteDoubleValueModifier>(AnnealingOperatorName, "The operator that cools the temperature."));
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105 | Parameters.Add(new LookupParameter<IntValue>(TemperatureStartIndexName, "The index where the annealing or heating was last changed."));
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106 | Parameters.Add(new LookupParameter<DoubleValue>(StartTemperatureName, "The temperature from which cooling or reheating should occur."));
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107 | Parameters.Add(new LookupParameter<DoubleValue>(EndTemperatureName, "The temperature to which should be cooled or heated."));
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108 | Parameters.Add(new LookupParameter<IntValue>(MaximumIterationsName, "The maximum number of iterations which should be processed."));
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109 | Parameters.Add(new LookupParameter<BoolValue>(IsAcceptedName, "Whether the move was accepted or not."));
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110 | Parameters.Add(new LookupParameter<ItemList<BoolValue>>(AcceptanceMemoryName, "Memorizes the last N acceptance decisions."));
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111 | Parameters.Add(new ValueParameter<IntValue>(ThresholdName, "How many consecutive solutions have to be rejected to trigger the reheat.", new IntValue(10)));
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112 | Parameters.Add(new LookupParameter<BoolValue>(CoolingName, "True when the temperature should be cooled, false otherwise."));
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113 | #endregion
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114 |
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115 | Parameterize();
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116 | }
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117 |
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118 | [StorableConstructor]
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119 | protected ConnollyReheatingOperator(bool deserializing) : base(deserializing) { }
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120 | protected ConnollyReheatingOperator(ConnollyReheatingOperator original, Cloner cloner) : base(original, cloner) { }
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121 |
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122 |
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123 | public override IDeepCloneable Clone(Cloner cloner)
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124 | {
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125 | return new ConnollyReheatingOperator(this, cloner);
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126 | }
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127 |
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128 | public void Parameterize()
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129 | {
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130 | }
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131 |
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132 | public override IOperation Apply()
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133 | {
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134 | var cooling = CoolingParameter.ActualValue.Value;
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135 |
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136 | if(cooling)
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137 | {
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138 | var acceptances = AcceptanceMemoryParameter.ActualValue;
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139 | acceptances.Add(IsAcceptedParameter.ActualValue);
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140 |
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141 | if (acceptances.Count > ThresholdParameter.Value.Value) acceptances.RemoveAt(0);
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142 | var stopCooling = acceptances.Count == ThresholdParameter.Value.Value && !acceptances.Any(x => x.Value);
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143 |
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144 | if(stopCooling)
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145 | {
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146 | CoolingParameter.ActualValue.Value = false;
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147 | return ReheatToIdealTemperature();
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148 | }else
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149 | {
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150 | return Cool();
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151 | }
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152 | }
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153 | else
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154 | {
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155 | return KeepTemperature();
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156 | }
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157 | }
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158 |
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159 | private IOperation ReheatToIdealTemperature()
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160 | {
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161 | var algorithm = ExecutionContext.Parent.Parent.Parent;
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162 | var results = (ResultCollection)algorithm.Scope.Variables[ResultsName].Value;
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163 | var bestQualitySoFar = (DoubleValue)results[BestQualityName].Value;
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164 | var temperatures = (DataTable)results[TemperatureChartName].Value;
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165 | var qualities = (DataTable)results[QualitiesName].Value;
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166 | var bestQualities = qualities.Rows[BestQualityName];
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167 | var indexOfBestQuality = bestQualities.Values.IndexOf(bestQualitySoFar.Value);
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168 | var bestTemperature = temperatures.Rows[TemperatureName].Values[indexOfBestQuality];
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169 |
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170 | TemperatureParameter.ActualValue.Value = bestTemperature;
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171 |
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172 | if (!results.ContainsKey(OptimalTemperatureName))
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173 | {
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174 | results.Add(new Result(OptimalTemperatureName, new DoubleValue(bestTemperature)));
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175 | }
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176 | else
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177 | {
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178 | results[OptimalTemperatureName].Value = new DoubleValue(bestTemperature);
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179 | }
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180 | return base.Apply();
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181 | }
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182 |
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183 | private IOperation Cool()
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184 | {
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185 | return new OperationCollection {
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186 | ExecutionContext.CreateOperation(AnnealingOperatorParameter.ActualValue),
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187 | base.Apply()
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188 | };
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189 | }
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190 |
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191 | private IOperation KeepTemperature()
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192 | {
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193 | return base.Apply();
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194 | }
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195 | }
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196 | }
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