[3078] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 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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[4068] | 25 | using HeuristicLab.Analysis;
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[3376] | 26 | using HeuristicLab.Common;
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[3078] | 27 | using HeuristicLab.Core;
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| 28 | using HeuristicLab.Data;
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| 29 | using HeuristicLab.Optimization;
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| 30 | using HeuristicLab.Optimization.Operators;
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| 31 | using HeuristicLab.Parameters;
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| 32 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[3368] | 33 | using HeuristicLab.Random;
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[3078] | 34 |
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[3103] | 35 | namespace HeuristicLab.Algorithms.LocalSearch {
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[3280] | 36 | [Item("Local Search", "A local search algorithm.")]
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[3078] | 37 | [Creatable("Algorithms")]
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[3201] | 38 | [StorableClass]
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[3103] | 39 | public sealed class LocalSearch : EngineAlgorithm {
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[3078] | 40 | #region Problem Properties
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| 41 | public override Type ProblemType {
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| 42 | get { return typeof(ISingleObjectiveProblem); }
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| 43 | }
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| 44 | public new ISingleObjectiveProblem Problem {
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| 45 | get { return (ISingleObjectiveProblem)base.Problem; }
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| 46 | set { base.Problem = value; }
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| 47 | }
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| 48 | #endregion
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| 49 |
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| 50 | #region Parameter Properties
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| 51 | private ValueParameter<IntValue> SeedParameter {
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| 52 | get { return (ValueParameter<IntValue>)Parameters["Seed"]; }
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| 53 | }
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| 54 | private ValueParameter<BoolValue> SetSeedRandomlyParameter {
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| 55 | get { return (ValueParameter<BoolValue>)Parameters["SetSeedRandomly"]; }
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| 56 | }
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| 57 | private ConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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| 58 | get { return (ConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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| 59 | }
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| 60 | private ConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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| 61 | get { return (ConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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| 62 | }
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| 63 | private ConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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| 64 | get { return (ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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| 65 | }
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| 66 | private ValueParameter<IntValue> MaximumIterationsParameter {
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| 67 | get { return (ValueParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 68 | }
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[3187] | 69 | private ValueParameter<IntValue> SampleSizeParameter {
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| 70 | get { return (ValueParameter<IntValue>)Parameters["SampleSize"]; }
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| 71 | }
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[3658] | 72 | private ValueParameter<MultiAnalyzer> AnalyzerParameter {
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| 73 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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[3621] | 74 | }
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[3078] | 75 | #endregion
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| 76 |
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| 77 | #region Properties
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| 78 | public IntValue Seed {
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| 79 | get { return SeedParameter.Value; }
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| 80 | set { SeedParameter.Value = value; }
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| 81 | }
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| 82 | public BoolValue SetSeedRandomly {
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| 83 | get { return SetSeedRandomlyParameter.Value; }
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| 84 | set { SetSeedRandomlyParameter.Value = value; }
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| 85 | }
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| 86 | public IMoveGenerator MoveGenerator {
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| 87 | get { return MoveGeneratorParameter.Value; }
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| 88 | set { MoveGeneratorParameter.Value = value; }
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| 89 | }
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| 90 | public IMoveMaker MoveMaker {
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| 91 | get { return MoveMakerParameter.Value; }
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| 92 | set { MoveMakerParameter.Value = value; }
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| 93 | }
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| 94 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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| 95 | get { return MoveEvaluatorParameter.Value; }
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| 96 | set { MoveEvaluatorParameter.Value = value; }
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| 97 | }
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| 98 | public IntValue MaximumIterations {
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| 99 | get { return MaximumIterationsParameter.Value; }
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| 100 | set { MaximumIterationsParameter.Value = value; }
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| 101 | }
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[3187] | 102 | public IntValue SampleSize {
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| 103 | get { return SampleSizeParameter.Value; }
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| 104 | set { SampleSizeParameter.Value = value; }
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| 105 | }
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[3658] | 106 | public MultiAnalyzer Analyzer {
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[3621] | 107 | get { return AnalyzerParameter.Value; }
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| 108 | set { AnalyzerParameter.Value = value; }
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| 109 | }
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[3078] | 110 | private RandomCreator RandomCreator {
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| 111 | get { return (RandomCreator)OperatorGraph.InitialOperator; }
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| 112 | }
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| 113 | private SolutionsCreator SolutionsCreator {
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| 114 | get { return (SolutionsCreator)RandomCreator.Successor; }
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| 115 | }
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[3103] | 116 | private LocalSearchMainLoop MainLoop {
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| 117 | get { return (LocalSearchMainLoop)SolutionsCreator.Successor; }
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[3078] | 118 | }
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[3689] | 119 | [Storable]
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[3662] | 120 | private BestAverageWorstQualityAnalyzer moveQualityAnalyzer;
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[3078] | 121 | #endregion
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| 122 |
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[3621] | 123 | [StorableConstructor]
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| 124 | private LocalSearch(bool deserializing) : base(deserializing) { }
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[3103] | 125 | public LocalSearch()
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[3078] | 126 | : base() {
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| 127 | Parameters.Add(new ValueParameter<IntValue>("Seed", "The random seed used to initialize the new pseudo random number generator.", new IntValue(0)));
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| 128 | Parameters.Add(new ValueParameter<BoolValue>("SetSeedRandomly", "True if the random seed should be set to a random value, otherwise false.", new BoolValue(true)));
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| 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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| 132 | Parameters.Add(new ValueParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(1000)));
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[3187] | 133 | Parameters.Add(new ValueParameter<IntValue>("SampleSize", "Number of moves that MultiMoveGenerators should create. This is ignored for Exhaustive- and SingleMoveGenerators.", new IntValue(100)));
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[3809] | 134 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution and moves.", new MultiAnalyzer()));
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[4068] | 135 |
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[3078] | 136 | RandomCreator randomCreator = new RandomCreator();
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| 137 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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[3103] | 138 | LocalSearchMainLoop lsMainLoop = new LocalSearchMainLoop();
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[3078] | 139 | OperatorGraph.InitialOperator = randomCreator;
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| 140 |
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| 141 | randomCreator.RandomParameter.ActualName = "Random";
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| 142 | randomCreator.SeedParameter.ActualName = SeedParameter.Name;
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| 143 | randomCreator.SeedParameter.Value = null;
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| 144 | randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
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| 145 | randomCreator.SetSeedRandomlyParameter.Value = null;
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| 146 | randomCreator.Successor = solutionsCreator;
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| 147 |
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| 148 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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| 149 | solutionsCreator.Successor = lsMainLoop;
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| 150 |
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| 151 | lsMainLoop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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| 152 | lsMainLoop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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| 153 | lsMainLoop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 154 | lsMainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 155 | lsMainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 156 | lsMainLoop.ResultsParameter.ActualName = "Results";
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[3621] | 157 | lsMainLoop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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[3078] | 158 |
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[3689] | 159 | moveQualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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| 160 | ParameterizeAnalyzers();
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| 161 | UpdateAnalyzers();
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| 162 |
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[3078] | 163 | Initialize();
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| 164 | }
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| 165 |
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| 166 | public override IDeepCloneable Clone(Cloner cloner) {
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[3103] | 167 | LocalSearch clone = (LocalSearch)base.Clone(cloner);
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[3689] | 168 | clone.moveQualityAnalyzer = (BestAverageWorstQualityAnalyzer)cloner.Clone(moveQualityAnalyzer);
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[3078] | 169 | clone.Initialize();
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| 170 | return clone;
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| 171 | }
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| 172 |
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[3275] | 173 | public override void Prepare() {
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[3265] | 174 | if (Problem != null && MoveGenerator != null && MoveMaker != null && MoveEvaluator != null)
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[3275] | 175 | base.Prepare();
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[3189] | 176 | }
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| 177 |
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[3078] | 178 | #region Events
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| 179 | protected override void OnProblemChanged() {
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| 180 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 181 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 182 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 183 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 184 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 185 | }
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| 186 | ParameterizeSolutionsCreator();
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[3134] | 187 | ParameterizeMainLoop();
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[3750] | 188 | UpdateMoveGenerator();
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| 189 | UpdateMoveParameters();
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| 190 | UpdateAnalyzers();
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[4048] | 191 | ParameterizeMoveGenerators();
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[3145] | 192 | ParameterizeMoveEvaluators();
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| 193 | ParameterizeMoveMakers();
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[3621] | 194 | ParameterizeAnalyzers();
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[3750] | 195 | ParameterizeIterationBasedOperators();
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[3078] | 196 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 197 | base.OnProblemChanged();
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| 198 | }
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| 199 | protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) {
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| 200 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 201 | ParameterizeSolutionsCreator();
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| 202 | base.Problem_SolutionCreatorChanged(sender, e);
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| 203 | }
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| 204 | protected override void Problem_EvaluatorChanged(object sender, EventArgs e) {
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| 205 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 206 | ParameterizeSolutionsCreator();
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[3134] | 207 | ParameterizeMainLoop();
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[3145] | 208 | ParameterizeMoveEvaluators();
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| 209 | ParameterizeMoveMakers();
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[3621] | 210 | ParameterizeAnalyzers();
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[3078] | 211 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 212 | base.Problem_EvaluatorChanged(sender, e);
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| 213 | }
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| 214 | protected override void Problem_OperatorsChanged(object sender, EventArgs e) {
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| 215 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 216 | // This may seem pointless, but some operators already have the eventhandler registered, others don't
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| 217 | // FIXME: Is there another way to solve this problem?
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| 218 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 219 | op.MoveQualityParameter.ActualNameChanged -= new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 220 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 221 | }
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| 222 | UpdateMoveGenerator();
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[3187] | 223 | UpdateMoveParameters();
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[3621] | 224 | UpdateAnalyzers();
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[3134] | 225 | ParameterizeMainLoop();
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[4048] | 226 | ParameterizeMoveGenerators();
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[3145] | 227 | ParameterizeMoveEvaluators();
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| 228 | ParameterizeMoveMakers();
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[3636] | 229 | ParameterizeAnalyzers();
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[3750] | 230 | ParameterizeIterationBasedOperators();
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[3078] | 231 | base.Problem_OperatorsChanged(sender, e);
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| 232 | }
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| 233 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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[3134] | 234 | ParameterizeMainLoop();
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[3145] | 235 | ParameterizeMoveEvaluators();
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| 236 | ParameterizeMoveMakers();
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[3078] | 237 | }
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| 238 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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| 239 | UpdateMoveParameters();
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| 240 | }
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| 241 | private void MoveEvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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[3134] | 242 | ParameterizeMainLoop();
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[3145] | 243 | ParameterizeMoveEvaluators();
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| 244 | ParameterizeMoveMakers();
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[3621] | 245 | ParameterizeAnalyzers();
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[3078] | 246 | }
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| 247 | private void MoveEvaluator_MoveQualityParameter_ActualNameChanged(object sender, EventArgs e) {
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[3134] | 248 | ParameterizeMainLoop();
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[3145] | 249 | ParameterizeMoveEvaluators();
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| 250 | ParameterizeMoveMakers();
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[3621] | 251 | ParameterizeAnalyzers();
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[3078] | 252 | }
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| 253 | #endregion
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| 254 |
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| 255 | #region Helpers
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| 256 | [StorableHook(HookType.AfterDeserialization)]
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| 257 | private void Initialize() {
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| 258 | if (Problem != null) {
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| 259 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 260 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 261 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 262 | }
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| 263 | }
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| 264 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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| 265 | MoveEvaluatorParameter.ValueChanged += new EventHandler(MoveEvaluatorParameter_ValueChanged);
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| 266 | }
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| 267 | private void UpdateMoveGenerator() {
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| 268 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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| 269 | MoveGeneratorParameter.ValidValues.Clear();
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| 270 | if (Problem != null) {
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| 271 | foreach (IMoveGenerator generator in Problem.Operators.OfType<IMoveGenerator>().OrderBy(x => x.Name))
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| 272 | MoveGeneratorParameter.ValidValues.Add(generator);
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| 273 | }
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[3145] | 274 | if (oldMoveGenerator != null) {
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| 275 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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| 276 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
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| 277 | }
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[3078] | 278 | if (MoveGenerator == null) {
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| 279 | ClearMoveParameters();
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| 280 | }
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| 281 | }
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| 282 | private void UpdateMoveParameters() {
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| 283 | IMoveMaker oldMoveMaker = MoveMaker;
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| 284 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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| 285 | ClearMoveParameters();
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[3131] | 286 | if (MoveGenerator != null) {
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| 287 | List<Type> moveTypes = MoveGenerator.GetType().GetInterfaces().Where(x => typeof(IMoveOperator).IsAssignableFrom(x)).ToList();
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| 288 | foreach (Type type in moveTypes.ToList()) {
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| 289 | if (moveTypes.Any(t => t != type && type.IsAssignableFrom(t)))
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| 290 | moveTypes.Remove(type);
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| 291 | }
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| 292 | foreach (Type type in moveTypes) {
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| 293 | var operators = Problem.Operators.Where(x => type.IsAssignableFrom(x.GetType())).OrderBy(x => x.Name);
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| 294 | foreach (IMoveMaker moveMaker in operators.OfType<IMoveMaker>())
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| 295 | MoveMakerParameter.ValidValues.Add(moveMaker);
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| 296 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in operators.OfType<ISingleObjectiveMoveEvaluator>())
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| 297 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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| 298 | }
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| 299 | if (oldMoveMaker != null) {
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| 300 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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| 301 | if (mm != null) MoveMaker = mm;
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| 302 | }
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| 303 | if (oldMoveEvaluator != null) {
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| 304 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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| 305 | if (me != null) MoveEvaluator = me;
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| 306 | }
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[3078] | 307 | }
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| 308 | }
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[3621] | 309 | private void UpdateAnalyzers() {
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| 310 | Analyzer.Operators.Clear();
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[3626] | 311 | if (Problem != null) {
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[3816] | 312 | foreach (IAnalyzer analyzer in Problem.Operators.OfType<IAnalyzer>()) {
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[3669] | 313 | foreach (IScopeTreeLookupParameter param in analyzer.Parameters.OfType<IScopeTreeLookupParameter>())
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| 314 | param.Depth = 0;
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[3621] | 315 | Analyzer.Operators.Add(analyzer);
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[3669] | 316 | }
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[3626] | 317 | }
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[3809] | 318 | Analyzer.Operators.Add(moveQualityAnalyzer);
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[3621] | 319 | }
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[3078] | 320 | private void ClearMoveParameters() {
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| 321 | MoveMakerParameter.ValidValues.Clear();
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| 322 | MoveEvaluatorParameter.ValidValues.Clear();
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| 323 | }
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| 324 | private void ParameterizeSolutionsCreator() {
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| 325 | SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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| 326 | SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name;
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| 327 | }
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[3134] | 328 | private void ParameterizeMainLoop() {
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[3145] | 329 | MainLoop.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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[3103] | 330 | MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 331 | MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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[3078] | 332 | if (MoveEvaluator != null)
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[3103] | 333 | MainLoop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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[3078] | 334 | }
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| 335 | private void ParameterizeStochasticOperator(IOperator op) {
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| 336 | if (op is IStochasticOperator)
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| 337 | ((IStochasticOperator)op).RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 338 | }
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[4048] | 339 | private void ParameterizeMoveGenerators() {
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| 340 | if (Problem != null) {
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| 341 | foreach (IMultiMoveGenerator generator in Problem.Operators.OfType<IMultiMoveGenerator>())
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| 342 | generator.SampleSizeParameter.ActualName = SampleSizeParameter.Name;
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| 343 | }
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| 344 | }
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[3145] | 345 | private void ParameterizeMoveEvaluators() {
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[3078] | 346 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 347 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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| 348 | }
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| 349 | }
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[3145] | 350 | private void ParameterizeMoveMakers() {
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[3078] | 351 | foreach (IMoveMaker op in Problem.Operators.OfType<IMoveMaker>()) {
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| 352 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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| 353 | if (MoveEvaluator != null)
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| 354 | op.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 355 | }
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| 356 | }
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[3621] | 357 | private void ParameterizeAnalyzers() {
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| 358 | moveQualityAnalyzer.ResultsParameter.ActualName = "Results";
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| 359 | if (Problem != null) {
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| 360 | moveQualityAnalyzer.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 361 | if (MoveEvaluator != null)
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| 362 | moveQualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 363 | moveQualityAnalyzer.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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| 364 | }
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| 365 | }
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[3750] | 366 | private void ParameterizeIterationBasedOperators() {
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| 367 | if (Problem != null) {
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| 368 | foreach (IIterationBasedOperator op in Problem.Operators.OfType<IIterationBasedOperator>()) {
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| 369 | op.IterationsParameter.ActualName = "Iterations";
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| 370 | op.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 371 | }
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| 372 | }
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| 373 | }
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[3078] | 374 | #endregion
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| 375 | }
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| 376 | }
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