[11516] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2014 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 System;
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| 23 | using System.Linq;
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| 24 | using HeuristicLab.Common;
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| 25 | using HeuristicLab.Core;
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| 26 | using HeuristicLab.Data;
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| 27 | using HeuristicLab.Operators;
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| 28 | using HeuristicLab.Optimization;
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| 29 | using HeuristicLab.Optimization.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.PluginInfrastructure;
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| 33 |
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| 34 | namespace HeuristicLab.Algorithms.VOffspringSelectionGeneticAlgorithm {
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| 35 | [Item("WeightedParentsDiversityComparator", "Compares the similarity against that of its parents (assumes the parents are subscopes to the child scope). This operator works with any number of subscopes > 0.")]
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| 36 | [StorableClass]
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| 37 | public class WeightedParentsDiversityComparator : SingleSuccessorOperator, ISubScopesQualityComparatorOperator, ISimilarityBasedOperator {
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| 38 | [Storable]
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| 39 | public ISolutionSimilarityCalculator SimilarityCalculator { get; set; }
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| 40 | public IValueLookupParameter<BoolValue> MaximizationParameter {
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| 41 | get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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| 42 | }
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| 43 | public ILookupParameter<DoubleValue> LeftSideParameter {
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| 44 | get { return (ILookupParameter<DoubleValue>)Parameters["LeftSide"]; }
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| 45 | }
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| 46 | public ILookupParameter<ItemArray<DoubleValue>> RightSideParameter {
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| 47 | get { return (ILookupParameter<ItemArray<DoubleValue>>)Parameters["RightSide"]; }
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| 48 | }
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| 49 | public ILookupParameter<BoolValue> ResultParameter {
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| 50 | get { return (ILookupParameter<BoolValue>)Parameters["Result"]; }
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| 51 | }
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| 52 | public ValueLookupParameter<DoubleValue> ComparisonFactorParameter {
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| 53 | get { return (ValueLookupParameter<DoubleValue>)Parameters["ComparisonFactor"]; }
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| 54 | }
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| 55 | public ValueLookupParameter<DoubleValue> DiversityComparisonFactorParameter {
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| 56 | get { return (ValueLookupParameter<DoubleValue>)Parameters["DiversityComparisonFactor"]; }
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| 57 | }
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| 58 | private ValueLookupParameter<DoubleValue> ComparisonFactorLowerBoundParameter {
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| 59 | get { return (ValueLookupParameter<DoubleValue>)Parameters["DiversityComparisonFactorLowerBound"]; }
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| 60 | }
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| 61 | private ValueLookupParameter<DoubleValue> ComparisonFactorUpperBoundParameter {
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| 62 | get { return (ValueLookupParameter<DoubleValue>)Parameters["DiversityComparisonFactorUpperBound"]; }
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| 63 | }
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| 64 | public IConstrainedValueParameter<IDiscreteDoubleValueModifier> ComparisonFactorModifierParameter {
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| 65 | get { return (IConstrainedValueParameter<IDiscreteDoubleValueModifier>)Parameters["ComparisonFactorModifier"]; }
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| 66 | }
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| 67 |
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| 68 | [StorableConstructor]
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| 69 | protected WeightedParentsDiversityComparator(bool deserializing) : base(deserializing) { }
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| 70 | protected WeightedParentsDiversityComparator(WeightedParentsDiversityComparator original, Cloner cloner) : base(original, cloner) { }
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| 71 | public WeightedParentsDiversityComparator()
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| 72 | : base() {
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| 73 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, false otherwise"));
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| 74 | Parameters.Add(new LookupParameter<DoubleValue>("LeftSide", "The quality of the child."));
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| 75 | Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("RightSide", "The qualities of the parents."));
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| 76 | Parameters.Add(new LookupParameter<BoolValue>("Result", "The result of the comparison: True means Quality is better, False means it is worse than parents."));
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| 77 | Parameters.Add(new ValueLookupParameter<DoubleValue>("ComparisonFactor", "Determines if the quality should be compared to the better parent (1.0), to the worse (0.0) or to any linearly interpolated value between them."));
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| 78 | Parameters.Add(new ValueLookupParameter<DoubleValue>("DiversityComparisonFactor", "Determines if the quality should be compared to the better parent (1.0), to the worse (0.0) or to any linearly interpolated value between them.", new DoubleValue(0.0)));
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| 79 | Parameters.Add(new ValueLookupParameter<DoubleValue>("DiversityComparisonFactorLowerBound", "The lower bound of the comparison factor (start).", new DoubleValue(0.5)));
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| 80 | Parameters.Add(new ValueLookupParameter<DoubleValue>("DiversityComparisonFactorUpperBound", "The upper bound of the comparison factor (end).", new DoubleValue(1.0)));
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| 81 | Parameters.Add(new OptionalConstrainedValueParameter<IDiscreteDoubleValueModifier>("ComparisonFactorModifier", "The operator used to modify the comparison factor.", new ItemSet<IDiscreteDoubleValueModifier>(new IDiscreteDoubleValueModifier[] { new LinearDiscreteDoubleValueModifier() }), new LinearDiscreteDoubleValueModifier()));
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| 82 |
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| 83 | foreach (IDiscreteDoubleValueModifier modifier in ApplicationManager.Manager.GetInstances<IDiscreteDoubleValueModifier>().OrderBy(x => x.Name))
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| 84 | ComparisonFactorModifierParameter.ValidValues.Add(modifier);
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| 85 | IDiscreteDoubleValueModifier linearModifier = ComparisonFactorModifierParameter.ValidValues.FirstOrDefault(x => x.GetType().Name.Equals("LinearDiscreteDoubleValueModifier"));
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| 86 | if (linearModifier != null) ComparisonFactorModifierParameter.Value = linearModifier;
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| 87 | ParameterizeComparisonFactorModifiers();
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| 88 | }
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| 89 |
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| 90 | public override IDeepCloneable Clone(Cloner cloner) {
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| 91 | return new WeightedParentsDiversityComparator(this, cloner);
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| 92 | }
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| 93 |
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| 94 | private void ParameterizeComparisonFactorModifiers() {
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| 95 | //TODO: does not work if Generations parameter names are changed
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| 96 | foreach (IDiscreteDoubleValueModifier modifier in ComparisonFactorModifierParameter.ValidValues) {
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| 97 | modifier.IndexParameter.ActualName = "Generations";
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| 98 | modifier.EndIndexParameter.ActualName = "MaximumGenerations";
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| 99 | modifier.EndValueParameter.ActualName = ComparisonFactorUpperBoundParameter.Name;
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| 100 | modifier.StartIndexParameter.Value = new IntValue(0);
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| 101 | modifier.StartValueParameter.ActualName = ComparisonFactorLowerBoundParameter.Name;
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| 102 | modifier.ValueParameter.ActualName = "DiversityComparisonFactor";
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| 103 | }
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| 104 | }
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| 105 |
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| 106 | public override IOperation Apply() {
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| 107 | ItemArray<DoubleValue> rightQualities = RightSideParameter.ActualValue;
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| 108 | if (rightQualities.Length < 1) throw new InvalidOperationException(Name + ": No subscopes found.");
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| 109 | double compFact = ComparisonFactorParameter.ActualValue.Value;
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| 110 | double diversityComFact = DiversityComparisonFactorParameter.ActualValue.Value;
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| 111 | bool maximization = MaximizationParameter.ActualValue.Value;
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| 112 | double leftQuality = LeftSideParameter.ActualValue.Value;
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| 113 | bool resultDiversity;
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| 114 |
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| 115 | double threshold = 0;
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| 116 |
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| 117 | #region Calculate threshold
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| 118 | if (rightQualities.Length == 2) {
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| 119 | var sim1 = SimilarityCalculator.CalculateSolutionSimilarity(ExecutionContext.Scope, ExecutionContext.Scope.SubScopes[0]);
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| 120 | var sim2 = SimilarityCalculator.CalculateSolutionSimilarity(ExecutionContext.Scope, ExecutionContext.Scope.SubScopes[1]);
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| 121 | var simAvg = (sim1 + sim2) / 2.0;
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| 122 |
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| 123 | //TODO: try out different things
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| 124 | //resultDiversity = simAvg < diversityComFact;
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| 125 | resultDiversity = sim1 < diversityComFact || sim2 < diversityComFact;
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| 126 |
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| 127 | double minQuality = Math.Min(rightQualities[0].Value, rightQualities[1].Value);
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| 128 | double maxQuality = Math.Max(rightQualities[0].Value, rightQualities[1].Value);
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| 129 | if (maximization)
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| 130 | threshold = minQuality + (maxQuality - minQuality) * compFact;
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| 131 | else
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| 132 | threshold = maxQuality - (maxQuality - minQuality) * compFact;
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| 133 | } else {
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| 134 | throw new NotImplementedException("Only 2 parents are supported.");
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| 135 | }
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| 136 | #endregion
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| 137 |
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| 138 | bool result = maximization && leftQuality > threshold || !maximization && leftQuality < threshold;
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| 139 | result = result && resultDiversity;
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| 140 | BoolValue resultValue = ResultParameter.ActualValue;
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| 141 | if (resultValue == null) {
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| 142 | ResultParameter.ActualValue = new BoolValue(result);
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| 143 | } else {
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| 144 | resultValue.Value = result;
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| 145 | }
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| 146 |
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| 147 | //like the placeholder, though we create child operations
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| 148 | OperationCollection next = new OperationCollection(base.Apply());
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| 149 | IOperator op = ComparisonFactorModifierParameter.Value;
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| 150 | if (op != null)
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| 151 | next.Insert(0, ExecutionContext.CreateChildOperation(op));
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| 152 | return next;
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| 153 | }
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| 154 | }
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| 155 | }
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