1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2012 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.Collections.Generic;
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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.Encodings.IntegerVectorEncoding;
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28 | using HeuristicLab.Operators;
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29 | using HeuristicLab.Parameters;
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30 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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31 |
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32 | namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Operators {
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33 | [Item("QualitySimilarityMerger", "Merges two populations by using quality and similarity information to maintain a population of high quality, but also diverse solutions.")]
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34 | [StorableClass]
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35 | public class QualitySimilarityMerger : SingleSuccessorOperator, IGQAPMerger {
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36 | public ILookupParameter<IntegerVector> AssignmentParameter {
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37 | get { return (ILookupParameter<IntegerVector>)Parameters["Assignment"]; }
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38 | }
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39 | public ILookupParameter<DoubleValue> QualityParameter {
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40 | get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
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41 | }
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42 | public ILookupParameter<IntValue> PopulationSizeParameter {
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43 | get { return (ILookupParameter<IntValue>)Parameters["PopulationSize"]; }
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44 | }
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45 | public IValueLookupParameter<BoolValue> MaximizationParameter {
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46 | get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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47 | }
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48 |
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49 | [StorableConstructor]
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50 | protected QualitySimilarityMerger(bool deserializing) : base(deserializing) { }
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51 | protected QualitySimilarityMerger(QualitySimilarityMerger original, Cloner cloner) : base(original, cloner) { }
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52 | public QualitySimilarityMerger()
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53 | : base() {
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54 | Parameters.Add(new LookupParameter<IntegerVector>("Assignment", "The equipment-location assignment."));
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55 | Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The quality of a solution."));
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56 | Parameters.Add(new LookupParameter<IntValue>("PopulationSize", "The size of the population that should not be surpassed."));
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57 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is to be maximized, false otherwise."));
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58 | }
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59 |
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60 | public override IDeepCloneable Clone(Cloner cloner) {
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61 | return new QualitySimilarityMerger(this, cloner);
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62 | }
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63 |
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64 | public override IOperation Apply() {
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65 | string vectorName = AssignmentParameter.TranslatedName;
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66 | string qualityName = QualityParameter.TranslatedName;
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67 | int populationSize = PopulationSizeParameter.ActualValue.Value;
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68 | bool maximization = MaximizationParameter.ActualValue.Value;
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69 |
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70 | IScope remaining = ExecutionContext.Scope.SubScopes[0];
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71 | IScope selected = ExecutionContext.Scope.SubScopes[1];
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72 |
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73 | List<Individual> population =
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74 | remaining.SubScopes.Select(x => new Individual((IntegerVector)x.Variables[vectorName].Value,
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75 | ((DoubleValue)x.Variables[qualityName].Value).Value,
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76 | x)).ToList();
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77 | HashSet<Individual> candidates = new HashSet<Individual>(
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78 | selected.SubScopes.Select(x => new Individual((IntegerVector)x.Variables[vectorName].Value,
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79 | ((DoubleValue)x.Variables[qualityName].Value).Value,
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80 | x)));
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81 |
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82 | foreach (var candidate in candidates) {
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83 | double[] similarities = population.Select(x => GQAPIntegerVectorProximityCalculator.CalculateGenotypeSimilarity(x.Solution, candidate.Solution)).ToArray();
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84 | if (!similarities.Any()) {
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85 | population.Add(candidate);
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86 | } else if (population.Count < populationSize) {
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87 | double maxSimilarity = similarities.Max();
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88 | if (maxSimilarity < 1.0)
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89 | population.Add(candidate);
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90 | } else {
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91 | var replacement = population.Select((v, i) => new { V = v, Index = i })
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92 | .Where(x => (maximization && x.V.Quality < candidate.Quality)
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93 | || (!maximization && x.V.Quality > candidate.Quality));
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94 | if (replacement.Any()) {
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95 | replacement.OrderBy(x => similarities[x.Index]).ToArray();
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96 | population.Remove(replacement.Last().V);
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97 | population.Add(candidate);
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98 | }
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99 | }
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100 | }
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101 |
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102 | ExecutionContext.Scope.SubScopes.Clear();
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103 | ExecutionContext.Scope.SubScopes.AddRange(population.Select(x => x.Scope));
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104 |
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105 | return base.Apply();
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106 | }
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107 |
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108 | private class Individual {
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109 | internal IntegerVector Solution { get; set; }
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110 | internal double Quality { get; set; }
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111 | internal IScope Scope { get; set; }
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112 |
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113 | internal Individual(IntegerVector vector, double quality, IScope scope) {
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114 | Solution = vector;
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115 | Quality = quality;
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116 | Scope = scope;
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117 | }
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118 | }
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119 | }
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120 | }
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