1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | * and the BEACON Center for the Study of Evolution in Action.
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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 | #endregion
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22 |
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23 | using System;
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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.BinaryVectorEncoding;
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28 | using HeuristicLab.Parameters;
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29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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30 | using HeuristicLab.Problems.Binary;
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31 |
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32 | namespace HeuristicLab.Algorithms.ParameterlessPopulationPyramid {
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33 | // This code is based off the publication
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34 | // B. W. Goldman and W. F. Punch, "Parameter-less Population Pyramid," GECCO, pp. 785–792, 2014
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35 | // and the original source code in C++11 available from: https://github.com/brianwgoldman/Parameter-less_Population_Pyramid
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36 | internal sealed class EvaluationTracker : BinaryProblem {
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37 | private readonly BinaryProblem problem;
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38 |
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39 | private int maxEvaluations;
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40 |
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41 | #region Properties
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42 | public double BestQuality {
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43 | get;
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44 | private set;
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45 | }
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46 |
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47 | public int Evaluations {
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48 | get;
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49 | private set;
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50 | }
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51 |
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52 | public int BestFoundOnEvaluation {
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53 | get;
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54 | private set;
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55 | }
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56 |
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57 | public BinaryVector BestSolution {
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58 | get;
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59 | private set;
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60 | }
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61 | #endregion
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62 |
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63 | [StorableConstructor]
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64 | private EvaluationTracker(bool deserializing) : base(deserializing) { }
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65 | private EvaluationTracker(EvaluationTracker original, Cloner cloner)
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66 | : base(original, cloner) {
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67 | problem = cloner.Clone(original.problem);
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68 | maxEvaluations = original.maxEvaluations;
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69 | BestQuality = original.BestQuality;
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70 | Evaluations = original.Evaluations;
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71 | BestFoundOnEvaluation = original.BestFoundOnEvaluation;
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72 | BestSolution = cloner.Clone(BestSolution);
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73 | }
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74 | public override IDeepCloneable Clone(Cloner cloner) {
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75 | return new EvaluationTracker(this, cloner);
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76 | }
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77 | public EvaluationTracker(BinaryProblem problem, int maxEvaluations) {
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78 | this.problem = problem;
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79 | this.maxEvaluations = maxEvaluations;
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80 | BestSolution = new BinaryVector(Length);
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81 | BestQuality = double.NaN;
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82 | Evaluations = 0;
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83 | BestFoundOnEvaluation = 0;
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84 |
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85 | if (Parameters.ContainsKey("Maximization")) Parameters.Remove("Maximization");
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86 | Parameters.Add(new FixedValueParameter<BoolValue>("Maximization", "Set to false if the problem should be minimized.", (BoolValue)new BoolValue(Maximization).AsReadOnly()) { Hidden = true });
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87 | }
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88 |
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89 | public override double Evaluate(BinaryVector vector, IRandom random) {
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90 | if (Evaluations >= maxEvaluations) throw new OperationCanceledException("Maximum Evaluation Limit Reached");
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91 | Evaluations++;
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92 | double fitness = problem.Evaluate(vector, random);
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93 | if (double.IsNaN(BestQuality) || problem.IsBetter(fitness, BestQuality)) {
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94 | BestQuality = fitness;
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95 | BestSolution = (BinaryVector)vector.Clone();
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96 | BestFoundOnEvaluation = Evaluations;
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97 | }
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98 | return fitness;
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99 | }
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100 |
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101 | public override int Length {
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102 | get { return problem.Length; }
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103 | set { problem.Length = value; }
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104 | }
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105 |
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106 | public override bool Maximization {
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107 | get {
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108 | if (problem == null) return false;
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109 | return problem.Maximization;
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110 | }
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111 | }
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112 |
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113 | public bool IsBetter(double quality, double bestQuality) {
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114 | return problem.IsBetter(quality, bestQuality);
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115 | }
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116 |
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117 | }
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118 | }
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