[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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[3376] | 25 | using HeuristicLab.Common;
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[3078] | 26 | using HeuristicLab.Core;
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| 27 | using HeuristicLab.Data;
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| 28 | using HeuristicLab.Optimization;
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| 29 | using HeuristicLab.Operators;
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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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| 33 | using HeuristicLab.PluginInfrastructure;
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[3368] | 34 | using HeuristicLab.Random;
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[3621] | 35 | using HeuristicLab.Analysis;
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[3078] | 36 |
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[3103] | 37 | namespace HeuristicLab.Algorithms.LocalSearch {
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[3280] | 38 | [Item("Local Search", "A local search algorithm.")]
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[3078] | 39 | [Creatable("Algorithms")]
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[3201] | 40 | [StorableClass]
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[3103] | 41 | public sealed class LocalSearch : EngineAlgorithm {
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[3078] | 42 | #region Problem Properties
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| 43 | public override Type ProblemType {
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| 44 | get { return typeof(ISingleObjectiveProblem); }
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| 45 | }
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| 46 | public new ISingleObjectiveProblem Problem {
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| 47 | get { return (ISingleObjectiveProblem)base.Problem; }
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| 48 | set { base.Problem = value; }
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| 49 | }
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| 50 | #endregion
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| 51 |
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| 52 | #region Parameter Properties
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| 53 | private ValueParameter<IntValue> SeedParameter {
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| 54 | get { return (ValueParameter<IntValue>)Parameters["Seed"]; }
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| 55 | }
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| 56 | private ValueParameter<BoolValue> SetSeedRandomlyParameter {
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| 57 | get { return (ValueParameter<BoolValue>)Parameters["SetSeedRandomly"]; }
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| 58 | }
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| 59 | private ConstrainedValueParameter<IMoveGenerator> MoveGeneratorParameter {
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| 60 | get { return (ConstrainedValueParameter<IMoveGenerator>)Parameters["MoveGenerator"]; }
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| 61 | }
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| 62 | private ConstrainedValueParameter<IMoveMaker> MoveMakerParameter {
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| 63 | get { return (ConstrainedValueParameter<IMoveMaker>)Parameters["MoveMaker"]; }
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| 64 | }
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| 65 | private ConstrainedValueParameter<ISingleObjectiveMoveEvaluator> MoveEvaluatorParameter {
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| 66 | get { return (ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>)Parameters["MoveEvaluator"]; }
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| 67 | }
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| 68 | private ValueParameter<IntValue> MaximumIterationsParameter {
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| 69 | get { return (ValueParameter<IntValue>)Parameters["MaximumIterations"]; }
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| 70 | }
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[3187] | 71 | private ValueParameter<IntValue> SampleSizeParameter {
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| 72 | get { return (ValueParameter<IntValue>)Parameters["SampleSize"]; }
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| 73 | }
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[3658] | 74 | private ValueParameter<MultiAnalyzer> MoveAnalyzerParameter {
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| 75 | get { return (ValueParameter<MultiAnalyzer>)Parameters["MoveAnalyzer"]; }
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[3621] | 76 | }
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[3658] | 77 | private ValueParameter<MultiAnalyzer> AnalyzerParameter {
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| 78 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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[3621] | 79 | }
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[3078] | 80 | #endregion
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| 81 |
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| 82 | #region Properties
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| 83 | public IntValue Seed {
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| 84 | get { return SeedParameter.Value; }
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| 85 | set { SeedParameter.Value = value; }
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| 86 | }
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| 87 | public BoolValue SetSeedRandomly {
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| 88 | get { return SetSeedRandomlyParameter.Value; }
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| 89 | set { SetSeedRandomlyParameter.Value = value; }
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| 90 | }
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| 91 | public IMoveGenerator MoveGenerator {
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| 92 | get { return MoveGeneratorParameter.Value; }
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| 93 | set { MoveGeneratorParameter.Value = value; }
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| 94 | }
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| 95 | public IMoveMaker MoveMaker {
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| 96 | get { return MoveMakerParameter.Value; }
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| 97 | set { MoveMakerParameter.Value = value; }
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| 98 | }
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| 99 | public ISingleObjectiveMoveEvaluator MoveEvaluator {
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| 100 | get { return MoveEvaluatorParameter.Value; }
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| 101 | set { MoveEvaluatorParameter.Value = value; }
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| 102 | }
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| 103 | public IntValue MaximumIterations {
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| 104 | get { return MaximumIterationsParameter.Value; }
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| 105 | set { MaximumIterationsParameter.Value = value; }
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| 106 | }
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[3187] | 107 | public IntValue SampleSize {
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| 108 | get { return SampleSizeParameter.Value; }
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| 109 | set { SampleSizeParameter.Value = value; }
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| 110 | }
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[3658] | 111 | public MultiAnalyzer MoveAnalyzer {
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[3621] | 112 | get { return MoveAnalyzerParameter.Value; }
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| 113 | set { MoveAnalyzerParameter.Value = value; }
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| 114 | }
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[3658] | 115 | public MultiAnalyzer Analyzer {
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[3621] | 116 | get { return AnalyzerParameter.Value; }
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| 117 | set { AnalyzerParameter.Value = value; }
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| 118 | }
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[3078] | 119 | private RandomCreator RandomCreator {
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| 120 | get { return (RandomCreator)OperatorGraph.InitialOperator; }
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| 121 | }
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| 122 | private SolutionsCreator SolutionsCreator {
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| 123 | get { return (SolutionsCreator)RandomCreator.Successor; }
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| 124 | }
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[3103] | 125 | private LocalSearchMainLoop MainLoop {
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| 126 | get { return (LocalSearchMainLoop)SolutionsCreator.Successor; }
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[3078] | 127 | }
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[3662] | 128 | private BestAverageWorstQualityAnalyzer moveQualityAnalyzer;
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[3078] | 129 | #endregion
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| 130 |
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[3621] | 131 | [StorableConstructor]
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| 132 | private LocalSearch(bool deserializing) : base(deserializing) { }
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[3103] | 133 | public LocalSearch()
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[3078] | 134 | : base() {
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| 135 | 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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| 136 | 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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| 137 | Parameters.Add(new ConstrainedValueParameter<IMoveGenerator>("MoveGenerator", "The operator used to generate moves to the neighborhood of the current solution."));
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| 138 | Parameters.Add(new ConstrainedValueParameter<IMoveMaker>("MoveMaker", "The operator used to perform a move."));
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| 139 | Parameters.Add(new ConstrainedValueParameter<ISingleObjectiveMoveEvaluator>("MoveEvaluator", "The operator used to evaluate a move."));
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| 140 | Parameters.Add(new ValueParameter<IntValue>("MaximumIterations", "The maximum number of generations which should be processed.", new IntValue(1000)));
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[3187] | 141 | 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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[3658] | 142 | Parameters.Add(new ValueParameter<MultiAnalyzer>("MoveAnalyzer", "The operator used to analyze the moves.", new MultiAnalyzer()));
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| 143 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution.", new MultiAnalyzer()));
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[3621] | 144 |
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[3078] | 145 | RandomCreator randomCreator = new RandomCreator();
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| 146 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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[3103] | 147 | LocalSearchMainLoop lsMainLoop = new LocalSearchMainLoop();
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[3078] | 148 | OperatorGraph.InitialOperator = randomCreator;
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| 149 |
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| 150 | randomCreator.RandomParameter.ActualName = "Random";
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| 151 | randomCreator.SeedParameter.ActualName = SeedParameter.Name;
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| 152 | randomCreator.SeedParameter.Value = null;
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| 153 | randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
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| 154 | randomCreator.SetSeedRandomlyParameter.Value = null;
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| 155 | randomCreator.Successor = solutionsCreator;
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| 156 |
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| 157 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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| 158 | solutionsCreator.Successor = lsMainLoop;
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| 159 |
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| 160 | lsMainLoop.MoveGeneratorParameter.ActualName = MoveGeneratorParameter.Name;
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| 161 | lsMainLoop.MoveMakerParameter.ActualName = MoveMakerParameter.Name;
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| 162 | lsMainLoop.MoveEvaluatorParameter.ActualName = MoveEvaluatorParameter.Name;
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| 163 | lsMainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 164 | lsMainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 165 | lsMainLoop.ResultsParameter.ActualName = "Results";
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[3621] | 166 | lsMainLoop.MoveAnalyzerParameter.ActualName = MoveAnalyzerParameter.Name;
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| 167 | lsMainLoop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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[3078] | 168 |
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| 169 | Initialize();
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| 170 | }
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| 171 |
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| 172 | public override IDeepCloneable Clone(Cloner cloner) {
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[3103] | 173 | LocalSearch clone = (LocalSearch)base.Clone(cloner);
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[3078] | 174 | clone.Initialize();
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| 175 | return clone;
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| 176 | }
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| 177 |
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[3275] | 178 | public override void Prepare() {
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[3265] | 179 | if (Problem != null && MoveGenerator != null && MoveMaker != null && MoveEvaluator != null)
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[3275] | 180 | base.Prepare();
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[3189] | 181 | }
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| 182 |
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[3078] | 183 | #region Events
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| 184 | protected override void OnProblemChanged() {
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| 185 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 186 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 187 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 188 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 189 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 190 | }
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| 191 | ParameterizeSolutionsCreator();
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[3134] | 192 | ParameterizeMainLoop();
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[3145] | 193 | ParameterizeMoveEvaluators();
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| 194 | ParameterizeMoveMakers();
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[3621] | 195 | ParameterizeAnalyzers();
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[3078] | 196 | UpdateMoveGenerator();
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[3187] | 197 | UpdateMoveParameters();
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[3621] | 198 | UpdateAnalyzers();
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[3078] | 199 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 200 | base.OnProblemChanged();
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| 201 | }
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| 202 | protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) {
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| 203 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 204 | ParameterizeSolutionsCreator();
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| 205 | base.Problem_SolutionCreatorChanged(sender, e);
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| 206 | }
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| 207 | protected override void Problem_EvaluatorChanged(object sender, EventArgs e) {
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| 208 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 209 | ParameterizeSolutionsCreator();
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[3134] | 210 | ParameterizeMainLoop();
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[3145] | 211 | ParameterizeMoveEvaluators();
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| 212 | ParameterizeMoveMakers();
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[3621] | 213 | ParameterizeAnalyzers();
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[3078] | 214 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 215 | base.Problem_EvaluatorChanged(sender, e);
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| 216 | }
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| 217 | protected override void Problem_OperatorsChanged(object sender, EventArgs e) {
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| 218 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 219 | // This may seem pointless, but some operators already have the eventhandler registered, others don't
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| 220 | // FIXME: Is there another way to solve this problem?
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| 221 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 222 | op.MoveQualityParameter.ActualNameChanged -= new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 223 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 224 | }
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| 225 | UpdateMoveGenerator();
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[3187] | 226 | UpdateMoveParameters();
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[3621] | 227 | UpdateAnalyzers();
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[3134] | 228 | ParameterizeMainLoop();
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[3145] | 229 | ParameterizeMoveEvaluators();
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| 230 | ParameterizeMoveMakers();
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[3636] | 231 | ParameterizeAnalyzers();
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[3078] | 232 | base.Problem_OperatorsChanged(sender, e);
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| 233 | }
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| 234 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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[3134] | 235 | ParameterizeMainLoop();
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[3145] | 236 | ParameterizeMoveEvaluators();
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| 237 | ParameterizeMoveMakers();
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[3078] | 238 | }
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| 239 | private void MoveGeneratorParameter_ValueChanged(object sender, EventArgs e) {
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| 240 | UpdateMoveParameters();
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| 241 | }
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| 242 | private void MoveEvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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[3134] | 243 | ParameterizeMainLoop();
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[3145] | 244 | ParameterizeMoveEvaluators();
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| 245 | ParameterizeMoveMakers();
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[3621] | 246 | ParameterizeAnalyzers();
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[3078] | 247 | }
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| 248 | private void MoveEvaluator_MoveQualityParameter_ActualNameChanged(object sender, EventArgs e) {
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[3134] | 249 | ParameterizeMainLoop();
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[3145] | 250 | ParameterizeMoveEvaluators();
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| 251 | ParameterizeMoveMakers();
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[3621] | 252 | ParameterizeAnalyzers();
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[3078] | 253 | }
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| 254 | #endregion
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| 255 |
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| 256 | #region Helpers
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| 257 | [StorableHook(HookType.AfterDeserialization)]
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| 258 | private void Initialize() {
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[3621] | 259 | InitializeAnalyzers();
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| 260 | UpdateAnalyzers();
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[3078] | 261 | if (Problem != null) {
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| 262 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 263 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 264 | op.MoveQualityParameter.ActualNameChanged += new EventHandler(MoveEvaluator_MoveQualityParameter_ActualNameChanged);
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| 265 | }
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| 266 | }
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| 267 | MoveGeneratorParameter.ValueChanged += new EventHandler(MoveGeneratorParameter_ValueChanged);
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| 268 | MoveEvaluatorParameter.ValueChanged += new EventHandler(MoveEvaluatorParameter_ValueChanged);
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| 269 | }
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[3621] | 270 | private void InitializeAnalyzers() {
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[3662] | 271 | moveQualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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[3621] | 272 | ParameterizeAnalyzers();
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| 273 | }
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[3078] | 274 | private void UpdateMoveGenerator() {
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| 275 | IMoveGenerator oldMoveGenerator = MoveGenerator;
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| 276 | MoveGeneratorParameter.ValidValues.Clear();
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| 277 | if (Problem != null) {
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| 278 | foreach (IMoveGenerator generator in Problem.Operators.OfType<IMoveGenerator>().OrderBy(x => x.Name))
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| 279 | MoveGeneratorParameter.ValidValues.Add(generator);
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| 280 | }
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[3145] | 281 | if (oldMoveGenerator != null) {
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| 282 | IMoveGenerator newMoveGenerator = MoveGeneratorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveGenerator.GetType());
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| 283 | if (newMoveGenerator != null) MoveGenerator = newMoveGenerator;
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| 284 | }
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[3078] | 285 | if (MoveGenerator == null) {
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| 286 | ClearMoveParameters();
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| 287 | }
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| 288 | }
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| 289 | private void UpdateMoveParameters() {
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| 290 | IMoveMaker oldMoveMaker = MoveMaker;
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| 291 | ISingleObjectiveMoveEvaluator oldMoveEvaluator = MoveEvaluator;
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| 292 | ClearMoveParameters();
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[3131] | 293 | if (MoveGenerator != null) {
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| 294 | List<Type> moveTypes = MoveGenerator.GetType().GetInterfaces().Where(x => typeof(IMoveOperator).IsAssignableFrom(x)).ToList();
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| 295 | foreach (Type type in moveTypes.ToList()) {
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| 296 | if (moveTypes.Any(t => t != type && type.IsAssignableFrom(t)))
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| 297 | moveTypes.Remove(type);
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| 298 | }
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| 299 | foreach (Type type in moveTypes) {
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| 300 | var operators = Problem.Operators.Where(x => type.IsAssignableFrom(x.GetType())).OrderBy(x => x.Name);
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| 301 | foreach (IMoveMaker moveMaker in operators.OfType<IMoveMaker>())
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| 302 | MoveMakerParameter.ValidValues.Add(moveMaker);
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| 303 | foreach (ISingleObjectiveMoveEvaluator moveEvaluator in operators.OfType<ISingleObjectiveMoveEvaluator>())
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| 304 | MoveEvaluatorParameter.ValidValues.Add(moveEvaluator);
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| 305 | }
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| 306 | if (oldMoveMaker != null) {
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| 307 | IMoveMaker mm = MoveMakerParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveMaker.GetType());
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| 308 | if (mm != null) MoveMaker = mm;
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| 309 | }
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| 310 | if (oldMoveEvaluator != null) {
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| 311 | ISingleObjectiveMoveEvaluator me = MoveEvaluatorParameter.ValidValues.FirstOrDefault(x => x.GetType() == oldMoveEvaluator.GetType());
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| 312 | if (me != null) MoveEvaluator = me;
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| 313 | }
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[3078] | 314 | }
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| 315 | }
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[3621] | 316 | private void UpdateAnalyzers() {
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| 317 | Analyzer.Operators.Clear();
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| 318 | MoveAnalyzer.Operators.Clear();
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| 319 | MoveAnalyzer.Operators.Add(moveQualityAnalyzer);
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[3626] | 320 | if (Problem != null) {
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[3658] | 321 | foreach (IAnalyzer analyzer in Problem.Operators.OfType<IAnalyzer>().OrderBy(x => x.Name))
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[3621] | 322 | Analyzer.Operators.Add(analyzer);
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[3626] | 323 | }
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[3621] | 324 | }
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[3078] | 325 | private void ClearMoveParameters() {
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| 326 | MoveMakerParameter.ValidValues.Clear();
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| 327 | MoveEvaluatorParameter.ValidValues.Clear();
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| 328 | }
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| 329 | private void ParameterizeSolutionsCreator() {
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| 330 | SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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| 331 | SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name;
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| 332 | }
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[3134] | 333 | private void ParameterizeMainLoop() {
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[3145] | 334 | MainLoop.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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[3103] | 335 | MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 336 | MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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[3078] | 337 | if (MoveEvaluator != null)
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[3103] | 338 | MainLoop.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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[3078] | 339 | }
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| 340 | private void ParameterizeStochasticOperator(IOperator op) {
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| 341 | if (op is IStochasticOperator)
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| 342 | ((IStochasticOperator)op).RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 343 | }
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[3145] | 344 | private void ParameterizeMoveEvaluators() {
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[3078] | 345 | foreach (ISingleObjectiveMoveEvaluator op in Problem.Operators.OfType<ISingleObjectiveMoveEvaluator>()) {
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| 346 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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| 347 | }
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| 348 | }
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[3145] | 349 | private void ParameterizeMoveMakers() {
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[3078] | 350 | foreach (IMoveMaker op in Problem.Operators.OfType<IMoveMaker>()) {
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| 351 | op.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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| 352 | if (MoveEvaluator != null)
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| 353 | op.MoveQualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 354 | }
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| 355 | }
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[3621] | 356 | private void ParameterizeAnalyzers() {
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| 357 | moveQualityAnalyzer.ResultsParameter.ActualName = "Results";
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| 358 | if (Problem != null) {
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| 359 | moveQualityAnalyzer.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 360 | if (MoveEvaluator != null)
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| 361 | moveQualityAnalyzer.QualityParameter.ActualName = MoveEvaluator.MoveQualityParameter.ActualName;
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| 362 | moveQualityAnalyzer.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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| 363 | }
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| 364 | }
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[3078] | 365 | #endregion
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| 366 | }
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| 367 | }
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