1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2008 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.Text;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Data;
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27 |
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28 | namespace HeuristicLab.Selection.OffspringSelection {
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29 | public class OffspringSelector : OperatorBase {
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30 | public override string Description {
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31 | get { return @"TODO\r\nOperator description still missing ..."; }
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32 | }
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33 |
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34 | public OffspringSelector() {
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35 | AddVariableInfo(new VariableInfo("SuccessfulChild", "True if the child was successful", typeof(BoolData), VariableKind.In));
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36 | AddVariableInfo(new VariableInfo("SelectionPressureLimit", "Maximum selection pressure", typeof(DoubleData), VariableKind.In));
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37 | AddVariableInfo(new VariableInfo("SuccessRatioLimit", "Maximum success ratio", typeof(DoubleData), VariableKind.In));
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38 | AddVariableInfo(new VariableInfo("SelectionPressure", "Current selection pressure", typeof(DoubleData), VariableKind.New | VariableKind.Out));
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39 | AddVariableInfo(new VariableInfo("SuccessRatio", "Current success ratio", typeof(DoubleData), VariableKind.New | VariableKind.Out));
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40 | AddVariableInfo(new VariableInfo("GoodChildren", "Temporarily store successful children", typeof(ItemList), VariableKind.New | VariableKind.Out | VariableKind.In | VariableKind.Deleted));
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41 | AddVariableInfo(new VariableInfo("BadChildren", "Temporarily store unsuccessful children", typeof(ItemList), VariableKind.New | VariableKind.Out | VariableKind.In | VariableKind.Deleted));
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42 | }
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43 |
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44 | public override IOperation Apply(IScope scope) {
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45 | double selectionPressureLimit = GetVariableValue<DoubleData>("SelectionPressureLimit", scope, true).Data;
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46 | double successRatioLimit = GetVariableValue<DoubleData>("SuccessRatioLimit", scope, true).Data;
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47 |
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48 | IScope parents = scope.SubScopes[0];
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49 | IScope children = scope.SubScopes[1];
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50 |
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51 | // retrieve good and bad children
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52 | ItemList goodChildren = GetVariableValue<ItemList>("GoodChildren", scope, false, false);
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53 | if (goodChildren == null) {
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54 | goodChildren = new ItemList();
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55 | goodChildren.ItemType = typeof(IScope);
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56 | IVariableInfo goodChildrenInfo = GetVariableInfo("GoodChildren");
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57 | if (goodChildrenInfo.Local)
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58 | AddVariable(new Variable(goodChildrenInfo.ActualName, goodChildren));
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59 | else
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60 | scope.AddVariable(new Variable(goodChildrenInfo.ActualName, goodChildren));
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61 | }
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62 | ItemList badChildren = GetVariableValue<ItemList>("BadChildren", scope, false, false);
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63 | if (badChildren == null) {
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64 | badChildren = new ItemList();
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65 | badChildren.ItemType = typeof(IScope);
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66 | IVariableInfo badChildrenInfo = GetVariableInfo("BadChildren");
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67 | if (badChildrenInfo.Local)
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68 | AddVariable(new Variable(badChildrenInfo.ActualName, badChildren));
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69 | else
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70 | scope.AddVariable(new Variable(badChildrenInfo.ActualName, badChildren));
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71 | }
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72 |
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73 | // separate new children in good and bad children
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74 | IVariableInfo successfulInfo = GetVariableInfo("SuccessfulChild");
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75 | while (children.SubScopes.Count > 0) {
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76 | IScope child = children.SubScopes[0];
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77 | bool successful = child.GetVariableValue<BoolData>(successfulInfo.ActualName, false).Data;
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78 | if (successful) goodChildren.Add(child);
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79 | else badChildren.Add(child);
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80 | children.RemoveSubScope(child);
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81 | }
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82 |
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83 | // calculate actual selection pressure and success ratio
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84 | DoubleData selectionPressure = GetVariableValue<DoubleData>("SelectionPressure", scope, false, false);
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85 | if (selectionPressure == null) {
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86 | IVariableInfo selectionPressureInfo = GetVariableInfo("SelectionPressure");
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87 | selectionPressure = new DoubleData(0);
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88 | if (selectionPressureInfo.Local)
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89 | AddVariable(new Variable(selectionPressureInfo.ActualName, selectionPressure));
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90 | else
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91 | scope.AddVariable(new Variable(selectionPressureInfo.ActualName, selectionPressure));
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92 | }
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93 | DoubleData successRatio = GetVariableValue<DoubleData>("SuccessRatio", scope, false, false);
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94 | if (successRatio == null) {
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95 | IVariableInfo successRatioInfo = GetVariableInfo("SuccessRatio");
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96 | successRatio = new DoubleData(0);
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97 | if (successRatioInfo.Local)
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98 | AddVariable(new Variable(successRatioInfo.ActualName, successRatio));
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99 | else
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100 | scope.AddVariable(new Variable(successRatioInfo.ActualName, successRatio));
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101 | }
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102 | int goodCount = goodChildren.Count;
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103 | int badCount = badChildren.Count;
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104 | selectionPressure.Data = (goodCount + badCount) / ((double)parents.SubScopes.Count);
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105 | successRatio.Data = goodCount / ((double)parents.SubScopes.Count);
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106 |
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107 | // check if enough children have been generated
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108 | if (((selectionPressure.Data < selectionPressureLimit) && (successRatio.Data < successRatioLimit)) ||
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109 | ((goodCount + badCount) < parents.SubScopes.Count)) {
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110 | // more children required -> reduce left and start children generation again
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111 | scope.RemoveSubScope(parents);
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112 | scope.RemoveSubScope(children);
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113 | for (int i = 0; i < parents.SubScopes.Count; i++)
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114 | scope.AddSubScope(parents.SubScopes[i]);
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115 |
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116 | return new AtomicOperation(SubOperators[0], scope);
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117 | } else {
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118 | // enough children generated
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119 | while (children.SubScopes.Count < parents.SubScopes.Count) {
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120 | if (goodChildren.Count > 0) {
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121 | children.AddSubScope((IScope)goodChildren[0]);
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122 | goodChildren.RemoveAt(0);
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123 | } else {
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124 | children.AddSubScope((IScope)badChildren[0]);
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125 | badChildren.RemoveAt(0);
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126 | }
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127 | }
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128 |
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129 | // remove good and bad children again
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130 | IVariableInfo goodChildrenInfo = GetVariableInfo("GoodChildren");
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131 | if (goodChildrenInfo.Local)
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132 | RemoveVariable(goodChildrenInfo.ActualName);
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133 | else
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134 | scope.RemoveVariable(goodChildrenInfo.ActualName);
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135 | IVariableInfo badChildrenInfo = GetVariableInfo("BadChildren");
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136 | if (badChildrenInfo.Local)
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137 | RemoveVariable(badChildrenInfo.ActualName);
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138 | else
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139 | scope.RemoveVariable(badChildrenInfo.ActualName);
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140 |
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141 | return null;
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142 | }
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143 | }
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144 | }
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145 | }
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