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("ConsecutiveRejectionTemperatureResetOperator", "The operator resets the temperature to X when N consecutive solutions are rejected. X is calculated by BaseResetTemperature * (MultiplyWithEachReheat to the power of the current number of reheats).")]
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19 | [StorableClass]
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20 | public class ConsecutiveRejectionTemperatureResetOperator : 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 IsAcceptedName = "IsAccepted";
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34 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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35 | private const string BaseResetTemperatureName = "BaseResetTemperature";
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36 | private const string MultiplyWithEachReheatName = "MultiplyWithEachReheat";
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37 | private const string ReheatCountName = "ReheatCount";
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38 | private const string MaximumNumberOfReheatsName = "MaximumNumberOfReheats";
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39 | #endregion
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40 |
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41 | #region Parameters
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42 | private ValueParameter<DoubleValue> BaseResetTemperatureParameter
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43 | {
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44 | get { return (ValueParameter<DoubleValue>)Parameters[BaseResetTemperatureName]; }
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45 | }
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46 | private ValueParameter<DoubleValue> MultiplyWithEachReheatParameter
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47 | {
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48 | get { return (ValueParameter<DoubleValue>)Parameters[MultiplyWithEachReheatName]; }
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49 | }
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50 | public ILookupParameter<DoubleValue> TemperatureParameter
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51 | {
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52 | get { return (ILookupParameter<DoubleValue>)Parameters[TemperatureName]; }
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53 | }
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54 | public ILookupParameter<DoubleValue> LowerTemperatureParameter
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55 | {
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56 | get { return (ILookupParameter<DoubleValue>)Parameters[LowerTemperatureName]; }
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57 | }
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58 | public ILookupParameter<DoubleValue> StartTemperatureParameter
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59 | {
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60 | get { return (ILookupParameter<DoubleValue>)Parameters[StartTemperatureName]; }
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61 | }
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62 | public ILookupParameter<DoubleValue> EndTemperatureParameter
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63 | {
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64 | get { return (ILookupParameter<DoubleValue>)Parameters[EndTemperatureName]; }
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65 | }
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66 | public ILookupParameter<IntValue> TemperatureStartIndexParameter
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67 | {
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68 | get { return (ILookupParameter<IntValue>)Parameters[TemperatureStartIndexName]; }
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69 | }
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70 | public ILookupParameter<IntValue> IterationsParameter
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71 | {
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72 | get { return (ILookupParameter<IntValue>)Parameters[IterationsName]; }
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73 | }
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74 | public ILookupParameter<IOperator> AnnealingOperatorParameter
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75 | {
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76 | get { return (ILookupParameter<IOperator>)Parameters[AnnealingOperatorName]; }
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77 | }
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78 | public ILookupParameter<IntValue> MaximumIterationsParameter
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79 | {
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80 | get { return (ILookupParameter<IntValue>)Parameters[MaximumIterationsName]; }
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81 | }
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82 | private ValueParameter<IntValue> ThresholdParameter
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83 | {
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84 | get { return (ValueParameter<IntValue>)Parameters[ThresholdName]; }
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85 | }
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86 | private ValueParameter<IntValue> MaxNumberOfReheatsParameter
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87 | {
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88 | get { return (ValueParameter<IntValue>)Parameters[MaximumNumberOfReheatsName]; }
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89 | }
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90 | public ILookupParameter<BoolValue> IsAcceptedParameter
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91 | {
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92 | get { return (ILookupParameter<BoolValue>)Parameters[IsAcceptedName]; }
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93 | }
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94 | public ILookupParameter<ItemList<BoolValue>> AcceptanceMemoryParameter
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95 | {
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96 | get { return (ILookupParameter<ItemList<BoolValue>>)Parameters[AcceptanceMemoryName]; }
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97 | }
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98 | public ILookupParameter<IntValue> ReheatCountParameter
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99 | {
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100 | get { return (ILookupParameter<IntValue>)Parameters[ReheatCountName]; }
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101 | }
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102 | #endregion
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103 |
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104 | public ConsecutiveRejectionTemperatureResetOperator() : base()
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105 | {
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106 | #region Create parameters
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107 | Parameters.Add(new LookupParameter<DoubleValue>(TemperatureName, "The current temperature."));
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108 | Parameters.Add(new LookupParameter<DoubleValue>(LowerTemperatureName, "The lower bound of the temperature."));
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109 | Parameters.Add(new LookupParameter<IntValue>(IterationsName, "The number of iterations."));
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110 | Parameters.Add(new LookupParameter<IOperator>(AnnealingOperatorName, "The operator that cools the temperature."));
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111 | Parameters.Add(new LookupParameter<IntValue>(TemperatureStartIndexName, "The index where the annealing or heating was last changed."));
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112 | Parameters.Add(new LookupParameter<DoubleValue>(StartTemperatureName, "The temperature from which cooling should occur."));
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113 | Parameters.Add(new LookupParameter<DoubleValue>(EndTemperatureName, "The temperature to which should be cooled."));
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114 | Parameters.Add(new LookupParameter<IntValue>(MaximumIterationsName, "The maximum number of iterations which should be processed."));
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115 | Parameters.Add(new LookupParameter<BoolValue>(IsAcceptedName, "Whether the move was accepted or not."));
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116 | Parameters.Add(new LookupParameter<ItemList<BoolValue>>(AcceptanceMemoryName, "Memorizes the last N acceptance decisions."));
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117 | Parameters.Add(new LookupParameter<IntValue>(ReheatCountName, "The number of reheats."));
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118 | Parameters.Add(new ValueParameter<IntValue>(ThresholdName, "How many consecutive rejected solutions must occur to trigger a reheat.", new IntValue(10)));
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119 | Parameters.Add(new ValueParameter<IntValue>(MaximumNumberOfReheatsName, "The maximum number of reheats which can be triggered", new IntValue(10)));
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120 | Parameters.Add(new ValueParameter<DoubleValue>(BaseResetTemperatureName, "The base reset temperature.", new DoubleValue(100d)));
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121 | Parameters.Add(new ValueParameter<DoubleValue>(MultiplyWithEachReheatName, "The amount the last reset temperature is multiplied with each reheat.", new DoubleValue(1d)));
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122 |
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123 | #endregion
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124 |
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125 | Parameterize();
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126 | }
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127 |
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128 | [StorableConstructor]
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129 | protected ConsecutiveRejectionTemperatureResetOperator(bool deserializing) : base(deserializing) { }
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130 | protected ConsecutiveRejectionTemperatureResetOperator(ConsecutiveRejectionTemperatureResetOperator original, Cloner cloner) : base(original, cloner) { }
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131 |
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132 |
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133 | public override IDeepCloneable Clone(Cloner cloner)
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134 | {
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135 | return new ConsecutiveRejectionTemperatureResetOperator(this, cloner);
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136 | }
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137 |
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138 | public void Parameterize()
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139 | {
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140 | }
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141 |
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142 | public override IOperation Apply()
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143 | {
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144 | var acceptances = AcceptanceMemoryParameter.ActualValue;
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145 |
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146 | acceptances.Add(IsAcceptedParameter.ActualValue);
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147 |
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148 | if (acceptances.Count > ThresholdParameter.Value.Value) acceptances.RemoveAt(0);
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149 |
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150 | var heating = acceptances.Count == ThresholdParameter.Value.Value && !acceptances.Any(x => x.Value) && !MaxNumberOfReheatsReached();
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151 |
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152 | return heating ? Heat() : Cool();
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153 | }
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154 |
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155 | private bool MaxNumberOfReheatsReached()
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156 | {
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157 | return ReheatCountParameter.ActualValue.Value >= MaxNumberOfReheatsParameter.Value.Value;
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158 | }
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159 |
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160 | private IOperation Heat()
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161 | {
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162 | ReheatCountParameter.ActualValue.Value++;
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163 |
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164 | AcceptanceMemoryParameter.ActualValue.Clear();
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165 |
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166 | var temperature = Math.Max(BaseResetTemperatureParameter.Value.Value * Math.Pow(MultiplyWithEachReheatParameter.Value.Value, ReheatCountParameter.ActualValue.Value), TemperatureParameter.ActualValue.Value);
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167 |
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168 | TemperatureParameter.ActualValue.Value = temperature;
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169 | TemperatureStartIndexParameter.ActualValue.Value = Math.Max(0, IterationsParameter.ActualValue.Value - 1);
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170 | StartTemperatureParameter.ActualValue.Value = TemperatureParameter.ActualValue.Value;
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171 | return base.Apply();
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172 | }
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173 |
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174 | private IOperation Cool()
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175 | {
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176 | return new OperationCollection {
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177 | ExecutionContext.CreateOperation(AnnealingOperatorParameter.ActualValue),
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178 | base.Apply()
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179 | };
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180 | }
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181 | }
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182 | }
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