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;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Data;
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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.Algorithms.ScatterSearch {
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33 | /// <summary>
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34 | /// An operator that updates the solution pool.
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35 | /// </summary>
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36 | [Item("SolutionPoolUpdateMethod", "An operator that updates the solution pool.")]
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37 | [StorableClass]
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38 | public sealed class SolutionPoolUpdateMethod : SingleSuccessorOperator {
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39 | #region Parameter properties
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40 | public ScopeParameter CurrentScopeParameter {
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41 | get { return (ScopeParameter)Parameters["CurrentScope"]; }
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42 | }
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43 | public IValueLookupParameter<BoolValue> NewSolutionsParameter {
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44 | get { return (IValueLookupParameter<BoolValue>)Parameters["NewSolutions"]; }
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45 | }
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46 | public IValueLookupParameter<IntValue> ReferenceSetSizeParameter {
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47 | get { return (IValueLookupParameter<IntValue>)Parameters["ReferenceSetSize"]; }
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48 | }
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49 | public IValueLookupParameter<IItem> QualityParameter {
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50 | get { return (IValueLookupParameter<IItem>)Parameters["Quality"]; }
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51 | }
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52 | public IValueLookupParameter<IItem> SolutionParameter {
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53 | get { return (IValueLookupParameter<IItem>)Parameters["Solution"]; }
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54 | }
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55 | #endregion
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56 |
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57 | #region Properties
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58 | private IScope CurrentScope {
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59 | get { return CurrentScopeParameter.ActualValue; }
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60 | }
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61 | private BoolValue NewSolutions {
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62 | get { return NewSolutionsParameter.ActualValue; }
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63 | }
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64 | private IntValue ReferenceSetSize {
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65 | get { return ReferenceSetSizeParameter.ActualValue; }
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66 | set { ReferenceSetSizeParameter.ActualValue = value; }
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67 | }
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68 | private IItem Quality {
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69 | get { return QualityParameter.ActualValue; }
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70 | }
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71 | #endregion
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72 |
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73 | [StorableConstructor]
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74 | private SolutionPoolUpdateMethod(bool deserializing) : base(deserializing) { }
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75 | private SolutionPoolUpdateMethod(SolutionPoolUpdateMethod original, Cloner cloner) : base(original, cloner) { }
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76 | public SolutionPoolUpdateMethod() : base() { Initialize(); }
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77 |
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78 | public override IDeepCloneable Clone(Cloner cloner) {
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79 | return new SolutionPoolUpdateMethod(this, cloner);
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80 | }
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81 |
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82 | private void Initialize() {
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83 | #region Create parameters
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84 | Parameters.Add(new ScopeParameter("CurrentScope"));
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85 | Parameters.Add(new ValueLookupParameter<BoolValue>("NewSolutions"));
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86 | Parameters.Add(new ValueLookupParameter<IntValue>("ReferenceSetSize"));
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87 | Parameters.Add(new ValueLookupParameter<IItem>("Quality"));
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88 | Parameters.Add(new ValueLookupParameter<IItem>("Solution"));
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89 | #endregion
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90 | SolutionParameter.ActualName = "KnapsackSolution"; // temporary solution for the knapsack problem
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91 | }
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92 |
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93 | public override IOperation Apply() {
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94 | IScope parents = new Scope("Parents");
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95 | IScope offspring = new Scope("Offspring");
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96 | foreach (var scope in CurrentScope.SubScopes) {
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97 | parents.SubScopes.AddRange(scope.SubScopes.Take(scope.SubScopes.Count - 1));
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98 | offspring.SubScopes.AddRange(scope.SubScopes.Last().SubScopes);
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99 | }
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100 | CurrentScope.SubScopes.Clear();
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101 | CurrentScope.SubScopes.AddRange(parents.SubScopes.OrderByDescending(o => o.Variables[QualityParameter.ActualName].Value));
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102 | if ((offspring.SubScopes.OrderByDescending(o => o.Variables[QualityParameter.ActualName].Value).First().Variables[QualityParameter.ActualName].Value as DoubleValue).Value
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103 | > (parents.SubScopes.OrderByDescending(o => o.Variables[QualityParameter.ActualName].Value).Last().Variables[QualityParameter.ActualName].Value as DoubleValue).Value) {
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104 | CurrentScope.SubScopes.Replace(parents.SubScopes.Concat(offspring.SubScopes.Distinct(new KeyEqualityComparer<IScope>(x => x.Variables[SolutionParameter.ActualName].Value.ToString()))).OrderByDescending(o => o.Variables[QualityParameter.ActualName].Value).Take(ReferenceSetSize.Value));
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105 | NewSolutions.Value = true;
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106 | }
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107 |
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108 | return base.Apply();
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109 | }
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110 |
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111 | private class KeyEqualityComparer<T> : IEqualityComparer<T> {
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112 | private readonly Func<T, object> keyExtractor;
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113 |
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114 | public KeyEqualityComparer(Func<T, object> keyExtractor) {
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115 | this.keyExtractor = keyExtractor;
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116 | }
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117 |
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118 | public bool Equals(T x, T y) {
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119 | return keyExtractor(x).Equals(keyExtractor(y));
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120 | }
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121 |
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122 | public int GetHashCode(T obj) {
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123 | return keyExtractor(obj).GetHashCode();
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124 | }
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125 | }
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126 | }
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127 | }
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