[15493] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2017 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 System.Threading;
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| 26 | using HeuristicLab.Common;
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| 27 | using HeuristicLab.Core;
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| 28 | using HeuristicLab.Data;
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| 29 | using HeuristicLab.Encodings.BinaryVectorEncoding;
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| 30 | using HeuristicLab.Encodings.PermutationEncoding;
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| 31 | using HeuristicLab.Optimization;
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| 32 | using HeuristicLab.Parameters;
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| 33 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 34 | using HeuristicLab.Random;
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| 35 |
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| 36 | namespace HeuristicLab.Problems.Scheduling.CFSAP {
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| 37 | [Item("Genetic Algorithm (CFSAP)", "")]
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| 38 | [StorableClass]
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| 39 | public class GeneticAlgorithm : BasicAlgorithm {
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| 40 | public override bool SupportsPause { get { return true; } }
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| 41 |
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| 42 | public override Type ProblemType {
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| 43 | get { return typeof(CFSAP); }
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| 44 | }
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| 45 |
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| 46 | public new CFSAP Problem {
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| 47 | get { return (CFSAP)base.Problem; }
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| 48 | set { base.Problem = value; }
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| 49 | }
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| 50 |
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| 51 | [Storable]
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| 52 | private IFixedValueParameter<IntValue> populationSizeParameter;
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| 53 | public IFixedValueParameter<IntValue> PopulationSizeParameter {
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| 54 | get { return populationSizeParameter; }
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| 55 | }
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| 56 | [Storable]
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| 57 | private IFixedValueParameter<IntValue> elitesParameter;
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| 58 | public IFixedValueParameter<IntValue> ElitesParameter {
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| 59 | get { return elitesParameter; }
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| 60 | }
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| 61 | [Storable]
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| 62 | private IFixedValueParameter<PercentValue> mutationProbabilityParameter;
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| 63 | public IFixedValueParameter<PercentValue> MutationProbabilityParameter {
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| 64 | get { return mutationProbabilityParameter; }
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| 65 | }
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| 66 | [Storable]
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| 67 | private IFixedValueParameter<IntValue> maximumGenerationsParameter;
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| 68 | public IFixedValueParameter<IntValue> MaximumGenerationsParameter {
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| 69 | get { return maximumGenerationsParameter; }
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| 70 | }
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| 71 | [Storable]
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| 72 | private IFixedValueParameter<IntValue> maximumEvaluatedSolutionsParameter;
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| 73 | public IFixedValueParameter<IntValue> MaximumEvaluatedSolutionsParameter {
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| 74 | get { return maximumEvaluatedSolutionsParameter; }
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| 75 | }
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| 76 | [Storable]
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| 77 | private IFixedValueParameter<BoolValue> pauseAfterGenerationParameter;
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| 78 | public IFixedValueParameter<BoolValue> PauseAfterGenerationParameter {
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| 79 | get { return pauseAfterGenerationParameter; }
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| 80 | }
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| 81 |
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| 82 | public int PopulationSize {
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| 83 | get { return populationSizeParameter.Value.Value; }
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| 84 | set { populationSizeParameter.Value.Value = value; }
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| 85 | }
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| 86 | public int Elites {
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| 87 | get { return elitesParameter.Value.Value; }
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| 88 | set { elitesParameter.Value.Value = value; }
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| 89 | }
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| 90 | public double MutationProbability {
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| 91 | get { return mutationProbabilityParameter.Value.Value; }
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| 92 | set { mutationProbabilityParameter.Value.Value = value; }
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| 93 | }
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| 94 | public int MaximumGenerations {
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| 95 | get { return maximumGenerationsParameter.Value.Value; }
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| 96 | set { maximumGenerationsParameter.Value.Value = value; }
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| 97 | }
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| 98 | public int MaximumEvaluatedSolutions {
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| 99 | get { return maximumEvaluatedSolutionsParameter.Value.Value; }
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| 100 | set { maximumEvaluatedSolutionsParameter.Value.Value = value; }
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| 101 | }
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| 102 | public bool PauseAfterGeneration {
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| 103 | get { return pauseAfterGenerationParameter.Value.Value; }
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| 104 | set { pauseAfterGenerationParameter.Value.Value = value; }
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| 105 | }
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| 106 |
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| 107 | [StorableConstructor]
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| 108 | protected GeneticAlgorithm(bool deserializing) : base(deserializing) { }
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| 109 | protected GeneticAlgorithm(GeneticAlgorithm original, Cloner cloner)
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| 110 | : base(original, cloner) {
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| 111 | populationSizeParameter = cloner.Clone(original.populationSizeParameter);
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| 112 | elitesParameter = cloner.Clone(original.elitesParameter);
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| 113 | mutationProbabilityParameter = cloner.Clone(original.mutationProbabilityParameter);
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| 114 | maximumGenerationsParameter = cloner.Clone(original.maximumGenerationsParameter);
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| 115 | maximumEvaluatedSolutionsParameter = cloner.Clone(original.maximumEvaluatedSolutionsParameter);
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| 116 | pauseAfterGenerationParameter = cloner.Clone(original.pauseAfterGenerationParameter);
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| 117 | generation = original.generation;
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| 118 | evaluatedSolutions = original.evaluatedSolutions;
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| 119 | bestQuality = original.bestQuality;
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| 120 | if (original.population != null)
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| 121 | population = original.population.Select(cloner.Clone).ToArray();
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| 122 | if (original.nextGeneration != null)
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| 123 | nextGeneration = original.nextGeneration.Select(cloner.Clone).ToArray();
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| 124 | if (original.optimalSequences != null)
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| 125 | optimalSequences = new HashSet<Permutation>(original.optimalSequences, new PermutationEqualityComparer());
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| 126 | }
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| 127 | public GeneticAlgorithm() {
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| 128 | Parameters.Add(populationSizeParameter = new FixedValueParameter<IntValue>("PopulationSize", "The size of the population, each individual of the population is a solution with a permutation and a binary vector.", new IntValue(100)));
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| 129 | Parameters.Add(elitesParameter = new FixedValueParameter<IntValue>("Elites", "The number of best individuals from the previous population that will continue to the next generation.", new IntValue(1)));
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| 130 | Parameters.Add(mutationProbabilityParameter = new FixedValueParameter<PercentValue>("MutationProbability", "The probability that an individual should be mutated after it has been created through crossover.", new PercentValue(0.05)));
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| 131 | Parameters.Add(maximumGenerationsParameter = new FixedValueParameter<IntValue>("MaximumGenerations", "The number of generations that the algorithm may run for.", new IntValue(1000000)));
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| 132 | Parameters.Add(maximumEvaluatedSolutionsParameter = new FixedValueParameter<IntValue>("MaximumEvaluatedSolutions", "The number of evaluated solutions before the algorithm terminates.", new IntValue(100000000)));
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| 133 | Parameters.Add(pauseAfterGenerationParameter = new FixedValueParameter<BoolValue>("PauseAfterGeneration", "Whether the algorithm should pause after each generation.", new BoolValue(true)));
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| 134 | }
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| 135 |
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| 136 | public override IDeepCloneable Clone(Cloner cloner) {
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| 137 | return new GeneticAlgorithm(this, cloner);
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| 138 | }
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| 139 |
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| 140 | protected override void OnProblemChanged() {
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| 141 | base.OnProblemChanged();
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| 142 | }
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| 143 |
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| 144 | [Storable]
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| 145 | private IRandom random;
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| 146 | [Storable]
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| 147 | private int generation;
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| 148 | [Storable]
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| 149 | private int evaluatedSolutions;
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| 150 | [Storable]
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| 151 | private double bestQuality;
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| 152 | [Storable]
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| 153 | private EncodedSolution[] population;
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| 154 | [Storable]
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| 155 | private EncodedSolution[] nextGeneration;
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| 156 | [Storable]
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| 157 | private HashSet<Permutation> optimalSequences;
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| 158 |
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| 159 | protected override void Initialize(CancellationToken cancellationToken) {
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| 160 | base.Initialize(cancellationToken);
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| 161 | random = new MersenneTwister();
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| 162 | optimalSequences = new HashSet<Permutation>(new PermutationEqualityComparer());
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| 163 | generation = 0;
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| 164 | evaluatedSolutions = 0;
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| 165 | population = new EncodedSolution[PopulationSize];
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| 166 | nextGeneration = new EncodedSolution[PopulationSize - Elites];
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| 167 | bestQuality = double.MaxValue;
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| 168 | for (var p = 0; p < PopulationSize; p++) {
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| 169 | population[p] = new EncodedSolution() {
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| 170 | Sequence = new Permutation(PermutationTypes.RelativeDirected, Problem.ProcessingTimes.Columns, random),
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| 171 | Assignment = new BinaryVector(Problem.ProcessingTimes.Columns, random)
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| 172 | };
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| 173 | population[p].Quality = Problem.Evaluate(population[p].Sequence, population[p].Assignment);
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| 174 | evaluatedSolutions++;
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| 175 | if (population[p].Quality < bestQuality) bestQuality = population[p].Quality;
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| 176 | }
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| 177 | Array.Sort(population);
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| 178 | Results.Add(new Result("BestQuality", new DoubleValue(bestQuality)));
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| 179 | Results.Add(new Result("EvaluatedSolutions", new IntValue(evaluatedSolutions)));
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| 180 | Results.Add(new Result("Generation", new IntValue(generation)));
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| 181 | if (PauseAfterGeneration) Pause();
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| 182 | }
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| 183 |
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| 184 | protected override void Run(CancellationToken cancellationToken) {
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| 185 | if (cancellationToken.IsCancellationRequested) return;
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| 186 |
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| 187 | while (generation < MaximumGenerations) {
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| 188 | if (evaluatedSolutions > MaximumEvaluatedSolutions) return;
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| 189 | for (var p = 0; p < PopulationSize - Elites; p++) {
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| 190 | var parent1 = TournamentSelect((int)Math.Round(Math.Max(PopulationSize / 71.0, 2)));
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| 191 | var parent2 = TournamentSelect((int)Math.Round(Math.Max(PopulationSize / 71.0, 2)));
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| 192 | nextGeneration[p] = new EncodedSolution() {
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| 193 | Sequence = CrossSequence(parent1.Sequence, parent2.Sequence),
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| 194 | Assignment = CrossAssignment(parent1.Assignment, parent2.Assignment)
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| 195 | };
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| 196 | var mutProb = random.NextDouble();
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| 197 | if (mutProb < MutationProbability) {
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| 198 | MutateSequence(nextGeneration[p].Sequence);
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| 199 | MutateAssignment(nextGeneration[p].Assignment);
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| 200 | }
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| 201 | nextGeneration[p].Quality = Problem.Evaluate(nextGeneration[p].Sequence, nextGeneration[p].Assignment);
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| 202 | evaluatedSolutions++;
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| 203 |
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| 204 | if (nextGeneration[p].Quality <= bestQuality) {
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| 205 | if (!optimalSequences.Contains(nextGeneration[p].Sequence)) {
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| 206 | int cycleTime;
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| 207 | var assignment = OptimalAssignment.MakeAssignment(nextGeneration[p].Sequence, Problem.ProcessingTimes, Problem.SetupTimes, out cycleTime);
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| 208 | evaluatedSolutions++;
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| 209 | nextGeneration[p].Assignment = new BinaryVector(assignment.Select(x => x == 1).ToArray());
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| 210 | nextGeneration[p].Quality = cycleTime;
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| 211 | optimalSequences.Add(nextGeneration[p].Sequence);
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| 212 | }
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| 213 | if (nextGeneration[p].Quality < bestQuality) {
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| 214 | bestQuality = nextGeneration[p].Quality;
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| 215 | ((DoubleValue)Results["BestQuality"].Value).Value = bestQuality;
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| 216 | }
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| 217 | }
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| 218 | }
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| 219 |
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| 220 | for (var p = Elites; p < PopulationSize; p++) {
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| 221 | population[p] = nextGeneration[p - Elites];
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| 222 | }
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| 223 | Array.Sort(population);
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| 224 |
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| 225 | generation++;
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| 226 |
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| 227 | ((IntValue)Results["EvaluatedSolutions"].Value).Value = evaluatedSolutions;
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| 228 | ((IntValue)Results["Generation"].Value).Value = generation;
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| 229 |
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| 230 | if (PauseAfterGeneration || cancellationToken.IsCancellationRequested) {
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| 231 | if (!cancellationToken.IsCancellationRequested) Pause();
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| 232 | break;
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| 233 | }
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| 234 | }
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| 235 | }
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| 236 |
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| 237 | private EncodedSolution TournamentSelect(int groupSize) {
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| 238 | var selected = population[random.Next(population.Length)];
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| 239 | for (var i = 1; i < groupSize; i++) {
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| 240 | var competitor = population[random.Next(population.Length)];
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| 241 | if (selected.Quality > competitor.Quality) {
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| 242 | selected = competitor;
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| 243 | }
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| 244 | }
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| 245 | return selected;
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| 246 | }
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| 247 |
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| 248 | private Permutation CrossSequence(Permutation sequence1, Permutation sequence2) {
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| 249 | var cx = random.Next(3);
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| 250 | switch (cx) {
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| 251 | case 0: return OrderCrossover.Apply(random, sequence1, sequence2);
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| 252 | case 1: return OrderCrossover2.Apply(random, sequence1, sequence2);
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| 253 | case 2: return MaximalPreservativeCrossover.Apply(random, sequence1, sequence2);
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| 254 | default: throw new InvalidOperationException("Crossover not defined.");
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| 255 | }
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| 256 | }
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| 257 |
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| 258 | private void MutateSequence(Permutation sequence) {
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| 259 | var cx = random.Next(7);
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| 260 | switch (cx) {
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| 261 | case 0: InversionManipulator.Apply(random, sequence); break;
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| 262 | case 1: InsertionManipulator.Apply(random, sequence); break;
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| 263 | case 2: Swap2Manipulator.Apply(random, sequence); break;
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| 264 | case 3: Swap3Manipulator.Apply(random, sequence); break;
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| 265 | case 4: TranslocationManipulator.Apply(random, sequence); break;
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| 266 | case 5: TranslocationInversionManipulator.Apply(random, sequence); break;
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| 267 | case 6: ScrambleManipulator.Apply(random, sequence); break;
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| 268 | default: throw new InvalidOperationException("Crossover not defined.");
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| 269 | }
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| 270 | }
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| 271 |
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| 272 | private BinaryVector CrossAssignment(BinaryVector assign1, BinaryVector assign2) {
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| 273 | var cx = random.Next(3);
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| 274 | switch (cx) {
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| 275 | case 0: return UniformCrossover.Apply(random, assign1, assign2);
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| 276 | case 1: return NPointCrossover.Apply(random, assign1, assign2, new IntValue(1));
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| 277 | case 2: return NPointCrossover.Apply(random, assign1, assign2, new IntValue(2));
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| 278 | default: throw new InvalidOperationException("Crossover not defined.");
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| 279 | }
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| 280 | }
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| 281 |
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| 282 | private void MutateAssignment(BinaryVector assignment) {
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| 283 | SomePositionsBitflipManipulator.Apply(random, assignment, new DoubleValue(0.2));
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| 284 | }
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| 285 |
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| 286 | private class EncodedSolution : IDeepCloneable, IComparable<EncodedSolution> {
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| 287 | public Permutation Sequence { get; set; }
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| 288 | public BinaryVector Assignment { get; set; }
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| 289 | public double Quality { get; set; }
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| 290 |
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| 291 | public IDeepCloneable Clone(Cloner cloner) {
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| 292 | return new EncodedSolution() {
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| 293 | Sequence = cloner.Clone(this.Sequence),
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| 294 | Assignment = cloner.Clone(this.Assignment),
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| 295 | Quality = this.Quality
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| 296 | };
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| 297 | }
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| 298 |
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| 299 | public object Clone() {
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| 300 | return Clone(new Cloner());
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| 301 | }
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| 302 |
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| 303 | public int CompareTo(EncodedSolution other) {
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| 304 | return Quality.CompareTo(other.Quality);
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| 305 | }
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| 306 | }
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| 307 | }
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| 308 | }
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