[14452] | 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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[15001] | 32 | using HeuristicLab.Optimization;
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[14452] | 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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[14555] | 41 | private const string ReheatingOperatorName = "ReheatingOperator";
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[14452] | 42 | private const string AnnealingOperatorName = "AnnealingOperator";
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| 43 | private const string MaximumIterationsName = "MaximumIterations";
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[15001] | 44 | private const string InitialTemperatureName = "InitialTemperature";
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[14452] | 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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[15001] | 53 | private const string ConsecutiveRejectedSolutionsCountName = "ConsecutiveRejectedSolutions";
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| 54 | private const string AverageAcceptanceRatioName = "AverageAcceptanceRatio";
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[14452] | 55 | private const string AcceptanceMemoryName = "AcceptanceMemory";
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[15001] | 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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[14452] | 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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[15001] | 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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[14452] | 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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[14555] | 107 | public IValueLookupParameter<IReheatingOperator> ReheatingOperatorParameter
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[14452] | 108 | {
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[14555] | 109 | get { return (IValueLookupParameter<IReheatingOperator>)Parameters[ReheatingOperatorName]; }
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[14452] | 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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[15001] | 119 | public ILookupParameter<ItemList<DoubleValue>> UphillMovesMemoryParameter
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[14702] | 120 | {
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[15001] | 121 | get { return (ILookupParameter<ItemList<DoubleValue>>)Parameters[UphillMovesMemoryName]; }
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[14702] | 122 | }
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[15001] | 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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[14452] | 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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[15001] | 159 | Parameters.Add(new ValueLookupParameter<BoolValue>(MaximizationName, "True if the problem is a maximization problem, otherwise false."));
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[14452] | 160 | Parameters.Add(new ValueLookupParameter<IOperator>(AnnealingOperatorName, "The operator that cools the temperature."));
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[14555] | 161 | Parameters.Add(new ValueLookupParameter<IReheatingOperator>(ReheatingOperatorName, "The operator that reheats the temperature if necessary."));
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[14452] | 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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[15001] | 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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[14452] | 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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[15001] | 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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[14555] | 193 | ExecutionContext.CreateOperation(ReheatingOperatorParameter.ActualValue),
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[14452] | 194 | base.Apply()
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| 195 | };
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[15001] | 196 | }
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[14452] | 197 | }
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[15001] | 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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[14452] | 246 | }
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| 247 | } |
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