[5622] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2011 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.Linq;
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[5809] | 24 | using HeuristicLab.Analysis;
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| 25 | using HeuristicLab.Common;
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[5622] | 26 | using HeuristicLab.Core;
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[5809] | 27 | using HeuristicLab.Data;
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[5622] | 28 | using HeuristicLab.Operators;
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| 29 | using HeuristicLab.Optimization;
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[5809] | 30 | using HeuristicLab.Parameters;
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| 31 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[5622] | 32 |
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| 33 | namespace HeuristicLab.Algorithms.LocalSearch {
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| 34 | /// <summary>
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| 35 | /// A local search improvement operator.
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| 36 | /// </summary>
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[5735] | 37 | [Item("LocalSearchImprovementOperator", "A local search improvement operator.")]
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[5622] | 38 | [StorableClass]
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[6043] | 39 | public sealed class LocalSearchImprovementOperator : SingleSuccessorOperator, ILocalImprovementOperator, IStochasticOperator {
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[6042] | 40 | #region IGenericLocalImprovementOperator Properties
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| 41 | public Type ProblemType { get { return typeof(ISingleObjectiveHeuristicOptimizationProblem); } }
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| 42 | public IProblem Problem {
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| 43 | get { return problem; }
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| 44 | set {
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| 45 | if (problem != value) {
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| 46 | if (value != null && !(value is ISingleObjectiveHeuristicOptimizationProblem))
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| 47 | throw new ArgumentException("Only problems of type " + ProblemType.ToString() + " can be assigned.");
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| 48 | if (problem != null) DeregisterProblemEventHandlers();
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| 49 | problem = (ISingleObjectiveHeuristicOptimizationProblem)value;
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| 50 | if (problem != null) RegisterProblemEventHandlers();
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| 51 | UpdateProblem();
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| 52 | }
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| 53 | }
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| 54 | }
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| 55 | #endregion
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| 56 |
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[5622] | 57 | [Storable]
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[6042] | 58 | private ISingleObjectiveHeuristicOptimizationProblem problem;
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| 59 | [Storable]
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[5622] | 60 | private LocalSearchMainLoop loop;
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[5735] | 61 | [Storable]
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| 62 | private BestAverageWorstQualityAnalyzer qualityAnalyzer;
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[5809] | 63 |
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[6042] | 64 | #region Parameter Properties
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| 65 | public ConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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[5642] | 66 | get { return (ConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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[5622] | 67 | }
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[6042] | 68 | public ConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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[5642] | 69 | get { return (ConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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[5622] | 70 | }
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[6042] | 71 | public ConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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[5642] | 72 | get { return (ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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[5622] | 73 | }
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[6042] | 74 | public IValueLookupParameter<IntValue> SampleSizeParameter {
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| 75 | get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
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[5622] | 76 | }
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[5735] | 77 | public ValueParameter<MultiAnalyzer> AnalyzerParameter {
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| 78 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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[5622] | 79 | }
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[6042] | 80 | public ScopeTreeLookupParameter<DoubleValue> QualityParameter {
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| 81 | get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["Quality"]; }
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| 82 | }
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| 83 | public ILookupParameter<IRandom> RandomParameter {
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| 84 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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| 85 | }
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| 86 | #region ILocalImprovementOperator Parameters
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| 87 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
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| 88 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 89 | }
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| 90 | public ILookupParameter<IntValue> EvaluatedSolutionsParameter {
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| 91 | get { return (ILookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
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| 92 | }
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| 93 | public ILookupParameter<ResultCollection> ResultsParameter {
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| 94 | get { return (ILookupParameter<ResultCollection>)Parameters["Results"]; }
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| 95 | }
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| 96 | #endregion
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| 97 | #endregion
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[5622] | 98 |
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[6042] | 99 | #region Properties
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[5622] | 100 | public IMoveGenerator MoveGenerator {
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| 101 | get { return MoveGeneratorParameter.Value; }
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| 102 | set { MoveGeneratorParameter.Value = value; }
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| 103 | }
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| 104 | public IMoveMaker MoveMaker {
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| 105 | get { return MoveMakerParameter.Value; }
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| 106 | set { MoveMakerParameter.Value = value; }
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| 107 | }
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| 108 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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| 109 | get { return MoveEvaluatorParameter.Value; }
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| 110 | set { MoveEvaluatorParameter.Value = value; }
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| 111 | }
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[5735] | 112 | public MultiAnalyzer Analyzer {
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| 113 | get { return AnalyzerParameter.Value; }
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| 114 | set { AnalyzerParameter.Value = value; }
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| 115 | }
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[6042] | 116 | #endregion
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[5622] | 117 |
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| 118 | [StorableConstructor]
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[6042] | 119 | private LocalSearchImprovementOperator(bool deserializing) : base(deserializing) { }
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| 120 | private LocalSearchImprovementOperator(LocalSearchImprovementOperator original, Cloner cloner)
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[5622] | 121 | : base(original, cloner) {
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[5809] | 122 | this.loop = cloner.Clone(original.loop);
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| 123 | this.qualityAnalyzer = cloner.Clone(original.qualityAnalyzer);
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[6042] | 124 | this.problem = cloner.Clone(original.problem);
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| 125 | RegisterEventHandlers();
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[5622] | 126 | }
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[5735] | 127 | public LocalSearchImprovementOperator()
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[5622] | 128 | : base() {
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[5809] | 129 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
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| 130 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
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| 131 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
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[6042] | 132 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(150)));
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| 133 | Parameters.Add(new ValueLookupParameter<IntValue>("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators.", new IntValue(300)));
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[5809] | 134 | Parameters.Add(new LookupParameter<IntValue>("EvaluatedSolutions", "The number of evaluated moves."));
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| 135 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution.", new MultiAnalyzer()));
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[6042] | 136 | Parameters.Add(new LookupParameter<ResultCollection>("Results", "The name of the collection where the results are stored."));
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| 137 | Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("Quality", "The quality/fitness value of a solution."));
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| 138 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
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[5809] | 139 |
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[6042] | 140 | loop = new LocalSearchMainLoop();
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| 141 | ParameterizeLSMainLoop();
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| 142 |
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| 143 | qualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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| 144 | Analyzer.Operators.Add(qualityAnalyzer);
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| 145 |
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| 146 | RegisterEventHandlers();
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[5622] | 147 | }
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| 148 |
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[6042] | 149 | public override IDeepCloneable Clone(Cloner cloner) {
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| 150 | return new LocalSearchImprovementOperator(this, cloner);
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| 151 | }
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| 152 |
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| 153 | [StorableHook(HookType.AfterDeserialization)]
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| 154 | private void AfterDeserialization() {
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| 155 | RegisterEventHandlers();
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| 156 | }
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| 157 |
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| 158 | #region Event Handler Registration
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| 159 | private void RegisterEventHandlers() {
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[5642] | 160 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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[6042] | 161 | if (problem != null)
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| 162 | RegisterProblemEventHandlers();
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[5642] | 163 | }
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| 164 |
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[6042] | 165 | private void RegisterProblemEventHandlers() {
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| 166 | problem.Reset += new EventHandler(problem_Reset);
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| 167 | problem.OperatorsChanged += new EventHandler(problem_OperatorsChanged);
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| 168 | }
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| 169 |
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| 170 | private void DeregisterProblemEventHandlers() {
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| 171 | problem.Reset -= new EventHandler(problem_Reset);
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| 172 | problem.OperatorsChanged -= new EventHandler(problem_OperatorsChanged);
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| 173 | }
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| 174 | #endregion
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| 175 |
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| 176 | #region Event Handlers
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| 177 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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[5642] | 178 | ChooseMoveOperators();
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[6042] | 179 | ParameterizeLSMainLoop();
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| 180 | }
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[5642] | 181 |
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[6042] | 182 | private void problem_Reset(object sender, EventArgs e) {
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| 183 | UpdateProblem();
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| 184 | }
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[5735] | 185 |
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[6042] | 186 | private void problem_OperatorsChanged(object sender, EventArgs e) {
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| 187 | UpdateProblem();
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[5622] | 188 | }
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[6042] | 189 | #endregion
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[5622] | 190 |
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[6042] | 191 | #region Parameterize and Update Methods
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| 192 | private void UpdateProblem() {
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| 193 | UpdateMoveOperators();
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| 194 | ChooseMoveOperators();
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| 195 |
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| 196 | ParameterizeMoveGenerators();
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| 197 |
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| 198 | ParameterizeLSMainLoop();
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| 199 | ParameterizeAnalyzers();
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| 200 | }
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| 201 |
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| 202 | private void ParameterizeLSMainLoop() {
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| 203 | loop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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| 204 | loop.BestLocalQualityParameter.ActualName = QualityParameter.Name;
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| 205 | loop.EvaluatedMovesParameter.ActualName = EvaluatedSolutionsParameter.Name;
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| 206 | loop.IterationsParameter.ActualName = "LocalIterations";
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| 207 | loop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 208 | loop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 209 | loop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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| 210 | loop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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| 211 | loop.QualityParameter.ActualName = QualityParameter.Name;
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| 212 | loop.RandomParameter.ActualName = RandomParameter.Name;
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| 213 | loop.ResultsParameter.ActualName = ResultsParameter.Name;
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| 214 |
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[5735] | 215 | if (problem != null) {
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[6042] | 216 | loop.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
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| 217 | loop.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
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| 218 | }
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| 219 | if (MoveEvaluator != null) {
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| 220 | loop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 221 | }
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| 222 | }
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| 223 |
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| 224 | private void ParameterizeAnalyzers() {
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| 225 | qualityAnalyzer.ResultsParameter.ActualName = ResultsParameter.Name;
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| 226 | if (problem != null) {
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[5735] | 227 | qualityAnalyzer.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
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| 228 | if (MoveEvaluator != null)
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| 229 | qualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 230 | qualityAnalyzer.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
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| 231 | }
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| 232 | }
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| 233 |
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[6042] | 234 | private void UpdateMoveOperators() {
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[5642] | 235 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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| 236 | IMoveMaker oldMoveMaker = MoveMaker;
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| 237 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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| 238 |
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| 239 | ClearMoveParameters();
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| 240 |
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[5622] | 241 | if (problem != null) {
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[6042] | 242 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>().OrderBy(x => x.Name))
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[5622] | 243 | MoveGeneratorParameter.ValidValues.Add(generator);
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[6042] | 244 | foreach (IExhaustiveMoveGenerator generator in problem.Operators.OfType<IExhaustiveMoveGenerator>().OrderBy(x => x.Name))
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| 245 | MoveGeneratorParameter.ValidValues.Add(generator);
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[5622] | 246 |
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[6042] | 247 | if (oldMoveGenerator != null) {
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| 248 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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| 249 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
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| 250 | }
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[5622] | 251 |
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[6042] | 252 | ChooseMoveOperators(oldMoveMaker, oldMoveEvaluator);
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[5622] | 253 | }
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| 254 | }
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| 255 |
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[6042] | 256 | private void ChooseMoveOperators(IMoveMaker oldMoveMaker = null, ISingleObjectiveMoveEvaluator oldMoveEvaluator = null) {
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| 257 | if (oldMoveMaker == null) oldMoveMaker = MoveMaker;
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| 258 | if (oldMoveEvaluator == null) oldMoveEvaluator = MoveEvaluator;
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| 259 | MoveMakerParameter.ValidValues.Clear();
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| 260 | MoveEvaluatorParameter.ValidValues.Clear();
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[5642] | 261 |
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[6042] | 262 | if (MoveGenerator != null && Problem != null) {
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| 263 | IMoveGenerator generator = MoveGeneratorParameter.Value;
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| 264 | foreach (IMoveMaker moveMaker in MoveHelper.GetCompatibleMoveMakers(generator, Problem.Operators).OrderBy(x => x.Name))
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| 265 | MoveMakerParameter.ValidValues.Add(moveMaker);
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| 266 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in MoveHelper.GetCompatibleSingleObjectiveMoveEvaluators(generator, Problem.Operators).OrderBy(x => x.Name))
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| 267 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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[5642] | 268 |
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| 269 | if (oldMoveMaker != null) {
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[6042] | 270 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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[5642] | 271 | if (mm != null) MoveMaker = mm;
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[5809] | 272 | }
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[5642] | 273 | if (oldMoveEvaluator != null) {
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[6042] | 274 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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[5642] | 275 | if (me != null) MoveEvaluator = me;
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[5809] | 276 | }
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[5642] | 277 | }
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| 278 | }
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| 279 |
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[5622] | 280 | private void ClearMoveParameters() {
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[5642] | 281 | MoveGeneratorParameter.ValidValues.Clear();
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| 282 | MoveMakerParameter.ValidValues.Clear();
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| 283 | MoveEvaluatorParameter.ValidValues.Clear();
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[5622] | 284 | }
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| 285 |
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[6042] | 286 | private void ParameterizeMoveGenerators() {
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[5642] | 287 | if (problem != null) {
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| 288 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>())
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| 289 | generator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
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| 290 | }
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| 291 | }
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[6042] | 292 | #endregion
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[5642] | 293 |
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[5622] | 294 | public override IOperation Apply() {
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[6042] | 295 | IScope currentScope = ExecutionContext.Scope;
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| 296 |
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| 297 | Scope localScope = new Scope();
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[5622] | 298 | Scope individual = new Scope();
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| 299 |
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[6042] | 300 | foreach (IVariable var in currentScope.Variables)
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| 301 | individual.Variables.Add(var); // add reference to variable otherwise the analyzer fails (it's looking down the tree)
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[5622] | 302 |
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[6042] | 303 | localScope.SubScopes.Add(individual);
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| 304 | currentScope.SubScopes.Add(localScope);
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| 305 | int index = currentScope.SubScopes.Count - 1;
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[5622] | 306 |
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| 307 | SubScopesProcessor processor = new SubScopesProcessor();
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| 308 | SubScopesRemover remover = new SubScopesRemover();
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| 309 |
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| 310 | remover.RemoveAllSubScopes = false;
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| 311 | remover.SubScopeIndexParameter.Value = new IntValue(index);
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| 312 |
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[6042] | 313 | if (index > 0) {
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| 314 | EmptyOperator eo = new EmptyOperator();
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| 315 | for (int i = 0; i < index - 1; i++) {
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| 316 | processor.Operators.Add(eo);
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| 317 | }
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[5622] | 318 | }
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| 319 |
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[5751] | 320 | VariableCreator variableCreator = new VariableCreator();
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[6042] | 321 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(loop.IterationsParameter.ActualName, new IntValue(0)));
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| 322 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(loop.BestLocalQualityParameter.ActualName, new DoubleValue(0)));
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[5751] | 323 |
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| 324 | variableCreator.Successor = loop;
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| 325 |
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| 326 | processor.Operators.Add(variableCreator);
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[5622] | 327 | processor.Successor = remover;
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| 328 |
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[6042] | 329 | OperationCollection next = new OperationCollection(base.Apply());
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| 330 | next.Insert(0, ExecutionContext.CreateChildOperation(processor));
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[5622] | 331 |
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[6042] | 332 | return next;
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[5622] | 333 | }
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| 334 | }
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| 335 | }
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