[5622] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[15584] | 3 | * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[5622] | 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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[6044] | 30 | using HeuristicLab.Optimization.Operators;
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[5809] | 31 | using HeuristicLab.Parameters;
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| 32 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[5622] | 33 |
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| 34 | namespace HeuristicLab.Algorithms.LocalSearch {
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| 35 | /// <summary>
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| 36 | /// A local search improvement operator.
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| 37 | /// </summary>
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[5735] | 38 | [Item("LocalSearchImprovementOperator", "A local search improvement operator.")]
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[5622] | 39 | [StorableClass]
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[12005] | 40 | public sealed class LocalSearchImprovementOperator : SingleSuccessorOperator, ILocalImprovementAlgorithmOperator, IStochasticOperator, ISingleObjectiveOperator {
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[6042] | 41 | #region IGenericLocalImprovementOperator Properties
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| 42 | public Type ProblemType { get { return typeof(ISingleObjectiveHeuristicOptimizationProblem); } }
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| 43 | public IProblem Problem {
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| 44 | get { return problem; }
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| 45 | set {
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| 46 | if (problem != value) {
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| 47 | if (value != null && !(value is ISingleObjectiveHeuristicOptimizationProblem))
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| 48 | throw new ArgumentException("Only problems of type " + ProblemType.ToString() + " can be assigned.");
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| 49 | if (problem != null) DeregisterProblemEventHandlers();
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| 50 | problem = (ISingleObjectiveHeuristicOptimizationProblem)value;
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| 51 | if (problem != null) RegisterProblemEventHandlers();
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| 52 | UpdateProblem();
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| 53 | }
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| 54 | }
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| 55 | }
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| 56 | #endregion
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| 57 |
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[5622] | 58 | [Storable]
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[6042] | 59 | private ISingleObjectiveHeuristicOptimizationProblem problem;
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| 60 | [Storable]
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[5622] | 61 | private LocalSearchMainLoop loop;
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[5735] | 62 | [Storable]
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| 63 | private BestAverageWorstQualityAnalyzer qualityAnalyzer;
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[5809] | 64 |
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[6042] | 65 | #region Parameter Properties
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[8121] | 66 | public IConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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| 67 | get { return (IConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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[5622] | 68 | }
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[8121] | 69 | public IConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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| 70 | get { return (IConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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[5622] | 71 | }
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[8121] | 72 | public IConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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| 73 | get { return (IConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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[5622] | 74 | }
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[6042] | 75 | public IValueLookupParameter<IntValue> SampleSizeParameter {
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| 76 | get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
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[5622] | 77 | }
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[5735] | 78 | public ValueParameter<MultiAnalyzer> AnalyzerParameter {
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| 79 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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[5622] | 80 | }
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[6042] | 81 | public ScopeTreeLookupParameter<DoubleValue> QualityParameter {
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| 82 | get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["Quality"]; }
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| 83 | }
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| 84 | public ILookupParameter<IRandom> RandomParameter {
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| 85 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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| 86 | }
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| 87 | #region ILocalImprovementOperator Parameters
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| 88 | public IValueLookupParameter<IntValue> MaximumIterationsParameter {
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| 89 | get { return (IValueLookupParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 90 | }
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| 91 | public ILookupParameter<IntValue> EvaluatedSolutionsParameter {
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| 92 | get { return (ILookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
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| 93 | }
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| 94 | public ILookupParameter<ResultCollection> ResultsParameter {
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| 95 | get { return (ILookupParameter<ResultCollection>)Parameters["Results"]; }
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| 96 | }
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| 97 | #endregion
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| 98 | #endregion
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[5622] | 99 |
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[6042] | 100 | #region Properties
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[5622] | 101 | public IMoveGenerator MoveGenerator {
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| 102 | get { return MoveGeneratorParameter.Value; }
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| 103 | set { MoveGeneratorParameter.Value = value; }
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| 104 | }
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| 105 | public IMoveMaker MoveMaker {
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| 106 | get { return MoveMakerParameter.Value; }
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| 107 | set { MoveMakerParameter.Value = value; }
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| 108 | }
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| 109 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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| 110 | get { return MoveEvaluatorParameter.Value; }
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| 111 | set { MoveEvaluatorParameter.Value = value; }
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| 112 | }
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[5735] | 113 | public MultiAnalyzer Analyzer {
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| 114 | get { return AnalyzerParameter.Value; }
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| 115 | set { AnalyzerParameter.Value = value; }
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| 116 | }
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[6042] | 117 | #endregion
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[5622] | 118 |
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| 119 | [StorableConstructor]
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[6042] | 120 | private LocalSearchImprovementOperator(bool deserializing) : base(deserializing) { }
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| 121 | private LocalSearchImprovementOperator(LocalSearchImprovementOperator original, Cloner cloner)
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[5622] | 122 | : base(original, cloner) {
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[5809] | 123 | this.loop = cloner.Clone(original.loop);
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| 124 | this.qualityAnalyzer = cloner.Clone(original.qualityAnalyzer);
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[6042] | 125 | this.problem = cloner.Clone(original.problem);
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| 126 | RegisterEventHandlers();
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[5622] | 127 | }
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[5735] | 128 | public LocalSearchImprovementOperator()
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[5622] | 129 | : base() {
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[5809] | 130 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
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| 131 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
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| 132 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
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[6042] | 133 | Parameters.Add(new ValueLookupParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(150)));
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| 134 | 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] | 135 | Parameters.Add(new LookupParameter<IntValue>("EvaluatedSolutions", "The number of evaluated moves."));
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| 136 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution.", new MultiAnalyzer()));
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[6042] | 137 | Parameters.Add(new LookupParameter<ResultCollection>("Results", "The name of the collection where the results are stored."));
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| 138 | Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("Quality", "The quality/fitness value of a solution."));
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| 139 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
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[5809] | 140 |
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[6042] | 141 | loop = new LocalSearchMainLoop();
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[6044] | 142 | ((ResultsCollector)((SingleSuccessorOperator)loop.OperatorGraph.InitialOperator).Successor).CollectedValues.Remove(loop.BestLocalQualityParameter.Name);
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[6042] | 143 | ParameterizeLSMainLoop();
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| 144 |
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| 145 | qualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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| 146 | Analyzer.Operators.Add(qualityAnalyzer);
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| 147 |
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| 148 | RegisterEventHandlers();
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[5622] | 149 | }
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| 150 |
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[6042] | 151 | public override IDeepCloneable Clone(Cloner cloner) {
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| 152 | return new LocalSearchImprovementOperator(this, cloner);
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| 153 | }
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| 154 |
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| 155 | [StorableHook(HookType.AfterDeserialization)]
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| 156 | private void AfterDeserialization() {
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| 157 | RegisterEventHandlers();
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| 158 | }
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| 159 |
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| 160 | #region Event Handler Registration
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| 161 | private void RegisterEventHandlers() {
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[5642] | 162 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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[6042] | 163 | if (problem != null)
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| 164 | RegisterProblemEventHandlers();
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[5642] | 165 | }
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| 166 |
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[6042] | 167 | private void RegisterProblemEventHandlers() {
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| 168 | problem.Reset += new EventHandler(problem_Reset);
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| 169 | problem.OperatorsChanged += new EventHandler(problem_OperatorsChanged);
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| 170 | }
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| 171 |
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| 172 | private void DeregisterProblemEventHandlers() {
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| 173 | problem.Reset -= new EventHandler(problem_Reset);
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| 174 | problem.OperatorsChanged -= new EventHandler(problem_OperatorsChanged);
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| 175 | }
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| 176 | #endregion
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| 177 |
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| 178 | #region Event Handlers
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| 179 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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[5642] | 180 | ChooseMoveOperators();
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[6042] | 181 | ParameterizeLSMainLoop();
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| 182 | }
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[5642] | 183 |
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[6042] | 184 | private void problem_Reset(object sender, EventArgs e) {
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| 185 | UpdateProblem();
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| 186 | }
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[5735] | 187 |
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[6042] | 188 | private void problem_OperatorsChanged(object sender, EventArgs e) {
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| 189 | UpdateProblem();
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[5622] | 190 | }
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[6042] | 191 | #endregion
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[5622] | 192 |
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[6042] | 193 | #region Parameterize and Update Methods
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| 194 | private void UpdateProblem() {
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| 195 | UpdateMoveOperators();
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| 196 | ChooseMoveOperators();
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| 197 |
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| 198 | ParameterizeMoveGenerators();
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| 199 |
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| 200 | ParameterizeLSMainLoop();
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| 201 | ParameterizeAnalyzers();
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[6052] | 202 | UpdateAnalyzers();
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[6042] | 203 | }
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| 204 |
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| 205 | private void ParameterizeLSMainLoop() {
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| 206 | loop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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| 207 | loop.BestLocalQualityParameter.ActualName = QualityParameter.Name;
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| 208 | loop.EvaluatedMovesParameter.ActualName = EvaluatedSolutionsParameter.Name;
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| 209 | loop.IterationsParameter.ActualName = "LocalIterations";
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| 210 | loop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 211 | loop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 212 | loop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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| 213 | loop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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| 214 | loop.QualityParameter.ActualName = QualityParameter.Name;
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| 215 | loop.RandomParameter.ActualName = RandomParameter.Name;
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| 216 | loop.ResultsParameter.ActualName = ResultsParameter.Name;
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| 217 |
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[5735] | 218 | if (problem != null) {
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[6042] | 219 | loop.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
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| 220 | loop.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
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| 221 | }
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| 222 | if (MoveEvaluator != null) {
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| 223 | loop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 224 | }
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| 225 | }
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| 226 |
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| 227 | private void ParameterizeAnalyzers() {
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| 228 | qualityAnalyzer.ResultsParameter.ActualName = ResultsParameter.Name;
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| 229 | if (problem != null) {
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[5735] | 230 | qualityAnalyzer.MaximizationParameter.ActualName = problem.MaximizationParameter.Name;
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| 231 | if (MoveEvaluator != null)
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| 232 | qualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 233 | qualityAnalyzer.BestKnownQualityParameter.ActualName = problem.BestKnownQualityParameter.Name;
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| 234 | }
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| 235 | }
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| 236 |
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[6052] | 237 | private bool IsSubclassOfGeneric(Type generic, Type toCheck) {
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| 238 | while (toCheck != typeof(object)) {
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| 239 | var cur = toCheck.IsGenericType ? toCheck.GetGenericTypeDefinition() : toCheck;
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| 240 | if (generic == cur) {
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| 241 | return true;
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| 242 | }
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| 243 | toCheck = toCheck.BaseType;
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| 244 | }
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| 245 | return false;
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[7172] | 246 | }
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[6052] | 247 |
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| 248 | private void UpdateAnalyzers() {
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| 249 | Analyzer.Operators.Clear();
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| 250 | if (problem != null) {
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| 251 | foreach (IAnalyzer analyzer in problem.Operators.OfType<IAnalyzer>()) {
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| 252 | if (!IsSubclassOfGeneric(typeof(AlleleFrequencyAnalyzer<>), analyzer.GetType()) &&
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[12280] | 253 | !(analyzer is PopulationSimilarityAnalyzer)) {
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[6052] | 254 | IAnalyzer clone = analyzer.Clone() as IAnalyzer;
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| 255 | foreach (IScopeTreeLookupParameter param in clone.Parameters.OfType<IScopeTreeLookupParameter>())
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| 256 | param.Depth = 0;
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[8118] | 257 | Analyzer.Operators.Add(clone, false);
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[6052] | 258 | }
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| 259 | }
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| 260 | }
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[8118] | 261 | Analyzer.Operators.Add(qualityAnalyzer, false);
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[6052] | 262 | }
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| 263 |
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[6042] | 264 | private void UpdateMoveOperators() {
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[5642] | 265 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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| 266 | IMoveMaker oldMoveMaker = MoveMaker;
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| 267 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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| 268 |
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| 269 | ClearMoveParameters();
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| 270 |
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[5622] | 271 | if (problem != null) {
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[6042] | 272 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>().OrderBy(x => x.Name))
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[5622] | 273 | MoveGeneratorParameter.ValidValues.Add(generator);
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[6042] | 274 | foreach (IExhaustiveMoveGenerator generator in problem.Operators.OfType<IExhaustiveMoveGenerator>().OrderBy(x => x.Name))
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| 275 | MoveGeneratorParameter.ValidValues.Add(generator);
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[5622] | 276 |
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[6042] | 277 | if (oldMoveGenerator != null) {
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| 278 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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| 279 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
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| 280 | }
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[5622] | 281 |
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[6042] | 282 | ChooseMoveOperators(oldMoveMaker, oldMoveEvaluator);
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[5622] | 283 | }
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| 284 | }
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| 285 |
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[6042] | 286 | private void ChooseMoveOperators(IMoveMaker oldMoveMaker = null, ISingleObjectiveMoveEvaluator oldMoveEvaluator = null) {
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| 287 | if (oldMoveMaker == null) oldMoveMaker = MoveMaker;
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| 288 | if (oldMoveEvaluator == null) oldMoveEvaluator = MoveEvaluator;
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| 289 | MoveMakerParameter.ValidValues.Clear();
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| 290 | MoveEvaluatorParameter.ValidValues.Clear();
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[5642] | 291 |
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[6042] | 292 | if (MoveGenerator != null && Problem != null) {
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| 293 | IMoveGenerator generator = MoveGeneratorParameter.Value;
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[7999] | 294 | foreach (IMoveMaker moveMaker in MoveHelper.GetCompatibleMoveMakers(generator, Problem.Operators.OfType<IOperator>()).OrderBy(x => x.Name))
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[6042] | 295 | MoveMakerParameter.ValidValues.Add(moveMaker);
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[7999] | 296 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in MoveHelper.GetCompatibleSingleObjectiveMoveEvaluators(generator, Problem.Operators.OfType<IOperator>()).OrderBy(x => x.Name))
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[6042] | 297 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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[5642] | 298 |
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| 299 | if (oldMoveMaker != null) {
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[6042] | 300 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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[5642] | 301 | if (mm != null) MoveMaker = mm;
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[5809] | 302 | }
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[5642] | 303 | if (oldMoveEvaluator != null) {
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[6042] | 304 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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[5642] | 305 | if (me != null) MoveEvaluator = me;
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[5809] | 306 | }
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[5642] | 307 | }
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| 308 | }
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| 309 |
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[5622] | 310 | private void ClearMoveParameters() {
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[5642] | 311 | MoveGeneratorParameter.ValidValues.Clear();
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| 312 | MoveMakerParameter.ValidValues.Clear();
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| 313 | MoveEvaluatorParameter.ValidValues.Clear();
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[5622] | 314 | }
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| 315 |
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[6042] | 316 | private void ParameterizeMoveGenerators() {
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[5642] | 317 | if (problem != null) {
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| 318 | foreach (IMultiMoveGenerator generator in problem.Operators.OfType<IMultiMoveGenerator>())
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| 319 | generator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
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| 320 | }
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| 321 | }
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[6042] | 322 | #endregion
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[5642] | 323 |
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[5622] | 324 | public override IOperation Apply() {
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[6042] | 325 | IScope currentScope = ExecutionContext.Scope;
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| 326 |
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| 327 | Scope localScope = new Scope();
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[5622] | 328 | Scope individual = new Scope();
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| 329 |
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[6042] | 330 | foreach (IVariable var in currentScope.Variables)
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| 331 | individual.Variables.Add(var); // add reference to variable otherwise the analyzer fails (it's looking down the tree)
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[5622] | 332 |
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[6042] | 333 | localScope.SubScopes.Add(individual);
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| 334 | currentScope.SubScopes.Add(localScope);
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| 335 | int index = currentScope.SubScopes.Count - 1;
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[5622] | 336 |
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| 337 | SubScopesProcessor processor = new SubScopesProcessor();
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| 338 | SubScopesRemover remover = new SubScopesRemover();
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| 339 |
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| 340 | remover.RemoveAllSubScopes = false;
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| 341 | remover.SubScopeIndexParameter.Value = new IntValue(index);
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| 342 |
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[6042] | 343 | if (index > 0) {
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| 344 | EmptyOperator eo = new EmptyOperator();
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| 345 | for (int i = 0; i < index - 1; i++) {
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| 346 | processor.Operators.Add(eo);
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| 347 | }
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[5622] | 348 | }
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| 349 |
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[5751] | 350 | VariableCreator variableCreator = new VariableCreator();
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[6042] | 351 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>(loop.IterationsParameter.ActualName, new IntValue(0)));
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| 352 | variableCreator.CollectedValues.Add(new ValueParameter<DoubleValue>(loop.BestLocalQualityParameter.ActualName, new DoubleValue(0)));
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[5751] | 353 |
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| 354 | variableCreator.Successor = loop;
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| 355 |
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| 356 | processor.Operators.Add(variableCreator);
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[5622] | 357 | processor.Successor = remover;
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| 358 |
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[6042] | 359 | OperationCollection next = new OperationCollection(base.Apply());
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| 360 | next.Insert(0, ExecutionContext.CreateChildOperation(processor));
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[5622] | 361 |
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[6042] | 362 | return next;
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[5622] | 363 | }
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| 364 | }
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| 365 | }
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