[6042] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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[5603] | 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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[5603] | 26 | using HeuristicLab.Core;
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[5809] | 27 | using HeuristicLab.Data;
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| 28 | using HeuristicLab.Operators;
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[5603] | 29 | using HeuristicLab.Optimization;
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[5809] | 30 | using HeuristicLab.Optimization.Operators;
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[5603] | 31 | using HeuristicLab.Parameters;
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[5809] | 32 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[6042] | 33 | using HeuristicLab.PluginInfrastructure;
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[5603] | 34 | using HeuristicLab.Random;
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| 35 |
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| 36 | namespace HeuristicLab.Algorithms.VariableNeighborhoodSearch {
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[6057] | 37 | [Item("Variable Neighborhood Search", "A variable neighborhood search algorithm based on the description in Mladenovic, N. and Hansen, P. (1997). Variable neighborhood search. Computers & Operations Research Volume 24, Issue 11, pp. 1097-1100.")]
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[5603] | 38 | [Creatable("Algorithms")]
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| 39 | [StorableClass]
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[5809] | 40 | public sealed class VariableNeighborhoodSearch : HeuristicOptimizationEngineAlgorithm, IStorableContent {
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[5603] | 41 | public string Filename { get; set; }
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| 42 |
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| 43 | #region Problem Properties
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| 44 | public override Type ProblemType {
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[5809] | 45 | get { return typeof(ISingleObjectiveHeuristicOptimizationProblem); }
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[5603] | 46 | }
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[5809] | 47 | public new ISingleObjectiveHeuristicOptimizationProblem Problem {
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| 48 | get { return (ISingleObjectiveHeuristicOptimizationProblem)base.Problem; }
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[5603] | 49 | set { base.Problem = value; }
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| 50 | }
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| 51 | #endregion
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| 52 |
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| 53 | #region Parameter Properties
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[6042] | 54 | private FixedValueParameter<IntValue> SeedParameter {
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| 55 | get { return (FixedValueParameter<IntValue>)Parameters["Seed"]; }
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[5603] | 56 | }
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[6042] | 57 | private FixedValueParameter<BoolValue> SetSeedRandomlyParameter {
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| 58 | get { return (FixedValueParameter<BoolValue>)Parameters["SetSeedRandomly"]; }
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[5603] | 59 | }
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[6618] | 60 | public ConstrainedValueParameter<ILocalImprovementOperator> LocalImprovementParameter {
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[6042] | 61 | get { return (ConstrainedValueParameter<ILocalImprovementOperator>)Parameters["LocalImprovement"]; }
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[5603] | 62 | }
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[6618] | 63 | public ConstrainedValueParameter<IMultiNeighborhoodShakingOperator> ShakingOperatorParameter {
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[6042] | 64 | get { return (ConstrainedValueParameter<IMultiNeighborhoodShakingOperator>)Parameters["ShakingOperator"]; }
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[5603] | 65 | }
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[6042] | 66 | private FixedValueParameter<IntValue> MaximumIterationsParameter {
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| 67 | get { return (FixedValueParameter<IntValue>)Parameters["MaximumIterations"]; }
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[5603] | 68 | }
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| 69 | private ValueParameter<MultiAnalyzer> AnalyzerParameter {
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| 70 | get { return (ValueParameter<MultiAnalyzer>)Parameters["Analyzer"]; }
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| 71 | }
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[6042] | 72 | public FixedValueParameter<IntValue> LocalImprovementMaximumIterationsParameter {
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| 73 | get { return (FixedValueParameter<IntValue>)Parameters["LocalImprovementMaximumIterations"]; }
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[5642] | 74 | }
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[5603] | 75 | #endregion
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| 76 |
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| 77 | #region Properties
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| 78 | private RandomCreator RandomCreator {
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| 79 | get { return (RandomCreator)OperatorGraph.InitialOperator; }
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| 80 | }
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[5642] | 81 | public MultiAnalyzer Analyzer {
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| 82 | get { return AnalyzerParameter.Value; }
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| 83 | set { AnalyzerParameter.Value = value; }
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| 84 | }
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| 85 | private SolutionsCreator SolutionsCreator {
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| 86 | get { return (SolutionsCreator)RandomCreator.Successor; }
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| 87 | }
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[6042] | 88 | private VariableNeighborhoodSearchMainLoop MainLoop {
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| 89 | get { return FindMainLoop(SolutionsCreator.Successor); }
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| 90 | }
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[6618] | 91 | public int Seed {
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| 92 | get { return SeedParameter.Value.Value; }
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| 93 | set { SeedParameter.Value.Value = value; }
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| 94 | }
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| 95 | public bool SetSeedRandomly {
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| 96 | get { return SetSeedRandomlyParameter.Value.Value; }
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| 97 | set { SetSeedRandomlyParameter.Value.Value = value; }
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| 98 | }
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| 99 | public ILocalImprovementOperator LocalImprovement {
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| 100 | get { return LocalImprovementParameter.Value; }
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| 101 | set { LocalImprovementParameter.Value = value; }
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| 102 | }
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| 103 | public IMultiNeighborhoodShakingOperator ShakingOperator {
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| 104 | get { return ShakingOperatorParameter.Value; }
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| 105 | set { ShakingOperatorParameter.Value = value; }
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| 106 | }
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| 107 | public int MaximumIterations {
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| 108 | get { return MaximumIterationsParameter.Value.Value; }
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| 109 | set { MaximumIterationsParameter.Value.Value = value; }
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| 110 | }
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| 111 | public int LocalImprovementMaximumIterations {
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| 112 | get { return LocalImprovementMaximumIterationsParameter.Value.Value; }
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| 113 | set { LocalImprovementMaximumIterationsParameter.Value.Value = value; }
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| 114 | }
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[5603] | 115 | #endregion
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| 116 |
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[5642] | 117 | [Storable]
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| 118 | private BestAverageWorstQualityAnalyzer qualityAnalyzer;
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| 119 |
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[5603] | 120 | [StorableConstructor]
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| 121 | private VariableNeighborhoodSearch(bool deserializing) : base(deserializing) { }
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| 122 | private VariableNeighborhoodSearch(VariableNeighborhoodSearch original, Cloner cloner)
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| 123 | : base(original, cloner) {
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[5642] | 124 | qualityAnalyzer = cloner.Clone(original.qualityAnalyzer);
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[6042] | 125 | RegisterEventHandlers();
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[5603] | 126 | }
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| 127 | public VariableNeighborhoodSearch()
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| 128 | : base() {
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[6042] | 129 | Parameters.Add(new FixedValueParameter<IntValue>("Seed", "The random seed used to initialize the new pseudo random number generator.", new IntValue(0)));
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| 130 | Parameters.Add(new FixedValueParameter<BoolValue>("SetSeedRandomly", "True if the random seed should be set to a random value, otherwise false.", new BoolValue(true)));
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| 131 | Parameters.Add(new ConstrainedValueParameter<ILocalImprovementOperator>("LocalImprovement", "The local improvement operation"));
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| 132 | Parameters.Add(new ConstrainedValueParameter<IMultiNeighborhoodShakingOperator>("ShakingOperator", "The operator that performs the shaking of solutions."));
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| 133 | Parameters.Add(new FixedValueParameter<IntValue>("MaximumIterations", "The maximum number of iterations which should be processed.", new IntValue(50)));
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| 134 | Parameters.Add(new FixedValueParameter<IntValue>("LocalImprovementMaximumIterations", "The maximum number of iterations which should be performed in the local improvement phase.", new IntValue(50)));
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[5603] | 135 | Parameters.Add(new ValueParameter<MultiAnalyzer>("Analyzer", "The operator used to analyze the solution and moves.", new MultiAnalyzer()));
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| 136 |
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| 137 | RandomCreator randomCreator = new RandomCreator();
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| 138 | SolutionsCreator solutionsCreator = new SolutionsCreator();
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| 139 | VariableCreator variableCreator = new VariableCreator();
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| 140 | ResultsCollector resultsCollector = new ResultsCollector();
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| 141 | VariableNeighborhoodSearchMainLoop mainLoop = new VariableNeighborhoodSearchMainLoop();
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| 142 | OperatorGraph.InitialOperator = randomCreator;
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| 143 |
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| 144 | randomCreator.RandomParameter.ActualName = "Random";
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| 145 | randomCreator.SeedParameter.ActualName = SeedParameter.Name;
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| 146 | randomCreator.SeedParameter.Value = null;
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| 147 | randomCreator.SetSeedRandomlyParameter.ActualName = SetSeedRandomlyParameter.Name;
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| 148 | randomCreator.SetSeedRandomlyParameter.Value = null;
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| 149 | randomCreator.Successor = solutionsCreator;
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| 150 |
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| 151 | solutionsCreator.NumberOfSolutions = new IntValue(1);
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| 152 | solutionsCreator.Successor = variableCreator;
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| 153 |
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| 154 | variableCreator.Name = "Initialize Evaluated Solutions";
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[6042] | 155 |
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| 156 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("Iterations", new IntValue(0)));
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| 157 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("EvaluatedSolutions", new IntValue(0)));
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| 158 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("CurrentNeighborhoodIndex", new IntValue(0)));
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| 159 | variableCreator.CollectedValues.Add(new ValueParameter<IntValue>("NeighborhoodCount", new IntValue(0)));
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[5603] | 160 | variableCreator.Successor = resultsCollector;
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| 161 |
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| 162 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>("Evaluated Solutions", null, "EvaluatedSolutions"));
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[6042] | 163 | resultsCollector.CollectedValues.Add(new LookupParameter<IntValue>("Iterations"));
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[5603] | 164 | resultsCollector.ResultsParameter.ActualName = "Results";
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| 165 | resultsCollector.Successor = mainLoop;
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| 166 |
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[6042] | 167 | mainLoop.IterationsParameter.ActualName = "Iterations";
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| 168 | mainLoop.CurrentNeighborhoodIndexParameter.ActualName = "CurrentNeighborhoodIndex";
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| 169 | mainLoop.NeighborhoodCountParameter.ActualName = "NeighborhoodCount";
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[5603] | 170 | mainLoop.LocalImprovementParameter.ActualName = LocalImprovementParameter.Name;
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[6042] | 171 | mainLoop.ShakingOperatorParameter.ActualName = ShakingOperatorParameter.Name;
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[5603] | 172 | mainLoop.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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| 173 | mainLoop.RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 174 | mainLoop.ResultsParameter.ActualName = "Results";
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| 175 | mainLoop.AnalyzerParameter.ActualName = AnalyzerParameter.Name;
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| 176 | mainLoop.EvaluatedSolutionsParameter.ActualName = "EvaluatedSolutions";
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| 177 |
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[6042] | 178 | InitializeLocalImprovementOperators();
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[5642] | 179 | qualityAnalyzer = new BestAverageWorstQualityAnalyzer();
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| 180 | ParameterizeAnalyzers();
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| 181 | UpdateAnalyzers();
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| 182 |
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[6042] | 183 | RegisterEventHandlers();
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[5603] | 184 | }
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[5642] | 185 |
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[6042] | 186 | public override IDeepCloneable Clone(Cloner cloner) {
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| 187 | return new VariableNeighborhoodSearch(this, cloner);
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| 188 | }
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| 189 |
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| 190 | [StorableHook(HookType.AfterDeserialization)]
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| 191 | private void AfterDeserialization() {
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| 192 | RegisterEventHandlers();
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| 193 | }
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| 194 |
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[5642] | 195 | public override void Prepare() {
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| 196 | if (Problem != null) base.Prepare();
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| 197 | }
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| 198 |
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[6042] | 199 | private void RegisterEventHandlers() {
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| 200 | LocalImprovementParameter.ValueChanged += new EventHandler(LocalImprovementParameter_ValueChanged);
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[5642] | 201 | if (Problem != null) {
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| 202 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 203 | }
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| 204 | }
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| 205 |
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| 206 | #region Events
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| 207 | protected override void OnProblemChanged() {
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[6042] | 208 | InitializeLocalImprovementOperators();
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| 209 | UpdateShakingOperators();
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| 210 | UpdateAnalyzers();
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| 211 |
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[5642] | 212 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 213 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 214 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 215 | ParameterizeSolutionsCreator();
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[6042] | 216 | ParameterizeMainLoop();
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[5642] | 217 | ParameterizeAnalyzers();
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| 218 | ParameterizeIterationBasedOperators();
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[6042] | 219 | ParameterizeLocalImprovementOperators();
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[5642] | 220 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 221 | base.OnProblemChanged();
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| 222 | }
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| 223 | protected override void Problem_SolutionCreatorChanged(object sender, EventArgs e) {
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| 224 | ParameterizeStochasticOperator(Problem.SolutionCreator);
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| 225 | ParameterizeSolutionsCreator();
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| 226 | base.Problem_SolutionCreatorChanged(sender, e);
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| 227 | }
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| 228 | protected override void Problem_EvaluatorChanged(object sender, EventArgs e) {
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| 229 | ParameterizeStochasticOperator(Problem.Evaluator);
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| 230 | ParameterizeSolutionsCreator();
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[6042] | 231 | ParameterizeMainLoop();
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[5642] | 232 | ParameterizeAnalyzers();
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| 233 | Problem.Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
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| 234 | base.Problem_EvaluatorChanged(sender, e);
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| 235 | }
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| 236 | protected override void Problem_OperatorsChanged(object sender, EventArgs e) {
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[6042] | 237 | UpdateShakingOperators();
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| 238 | UpdateAnalyzers();
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[5642] | 239 | foreach (IOperator op in Problem.Operators) ParameterizeStochasticOperator(op);
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| 240 | ParameterizeIterationBasedOperators();
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| 241 | base.Problem_OperatorsChanged(sender, e);
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| 242 | }
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| 243 | private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
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[6042] | 244 | ParameterizeMainLoop();
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[5642] | 245 | ParameterizeAnalyzers();
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| 246 | }
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[6042] | 247 | private void LocalImprovementParameter_ValueChanged(object sender, EventArgs e) {
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| 248 | ParameterizeLocalImprovementOperators();
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[5752] | 249 | }
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[5642] | 250 | #endregion
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| 251 |
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| 252 | #region Helpers
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| 253 | private void ParameterizeSolutionsCreator() {
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| 254 | SolutionsCreator.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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| 255 | SolutionsCreator.SolutionCreatorParameter.ActualName = Problem.SolutionCreatorParameter.Name;
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| 256 | }
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| 257 | private void ParameterizeStochasticOperator(IOperator op) {
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| 258 | if (op is IStochasticOperator)
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| 259 | ((IStochasticOperator)op).RandomParameter.ActualName = RandomCreator.RandomParameter.ActualName;
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| 260 | }
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[6042] | 261 | private void ParameterizeMainLoop() {
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| 262 | MainLoop.EvaluatorParameter.ActualName = Problem.EvaluatorParameter.Name;
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| 263 | MainLoop.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 264 | MainLoop.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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[5642] | 265 | }
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| 266 | private void ParameterizeAnalyzers() {
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| 267 | qualityAnalyzer.ResultsParameter.ActualName = "Results";
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| 268 | if (Problem != null) {
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| 269 | qualityAnalyzer.MaximizationParameter.ActualName = Problem.MaximizationParameter.Name;
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| 270 | qualityAnalyzer.QualityParameter.ActualName = Problem.Evaluator.QualityParameter.ActualName;
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| 271 | qualityAnalyzer.QualityParameter.Depth = 1;
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| 272 | qualityAnalyzer.BestKnownQualityParameter.ActualName = Problem.BestKnownQualityParameter.Name;
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| 273 | }
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| 274 | }
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| 275 | private void ParameterizeIterationBasedOperators() {
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| 276 | if (Problem != null) {
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| 277 | foreach (IIterationBasedOperator op in Problem.Operators.OfType<IIterationBasedOperator>()) {
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[5735] | 278 | op.IterationsParameter.ActualName = "Iterations";
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[6042] | 279 | op.MaximumIterationsParameter.ActualName = MaximumIterationsParameter.Name;
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[5642] | 280 | }
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| 281 | }
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| 282 | }
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[6042] | 283 | private void ParameterizeLocalImprovementOperators() {
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| 284 | foreach (ILocalImprovementOperator op in LocalImprovementParameter.ValidValues) {
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| 285 | if (op != LocalImprovementParameter.Value) op.Problem = null;
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| 286 | op.MaximumIterationsParameter.Value = null;
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| 287 | op.MaximumIterationsParameter.ActualName = LocalImprovementMaximumIterationsParameter.Name;
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[5642] | 288 | }
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[6042] | 289 | if (LocalImprovementParameter.Value != null)
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| 290 | LocalImprovementParameter.Value.Problem = Problem;
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| 291 | }
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| 292 | private void InitializeLocalImprovementOperators() {
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| 293 | if (Problem == null) {
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| 294 | LocalImprovementParameter.ValidValues.Clear();
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| 295 | } else {
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| 296 | LocalImprovementParameter.ValidValues.RemoveWhere(x => !x.ProblemType.IsAssignableFrom(Problem.GetType()));
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| 297 | foreach (ILocalImprovementOperator op in ApplicationManager.Manager.GetInstances<ILocalImprovementOperator>().Where(x => x.ProblemType.IsAssignableFrom(Problem.GetType()))) {
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| 298 | if (!LocalImprovementParameter.ValidValues.Any(x => x.GetType() == op.GetType()))
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| 299 | LocalImprovementParameter.ValidValues.Add(op);
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[5642] | 300 | }
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| 301 | }
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| 302 | }
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[6042] | 303 | private void UpdateShakingOperators() {
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| 304 | ShakingOperatorParameter.ValidValues.Clear();
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| 305 | foreach (IMultiNeighborhoodShakingOperator op in Problem.Operators.OfType<IMultiNeighborhoodShakingOperator>()) {
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| 306 | ShakingOperatorParameter.ValidValues.Add(op);
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| 307 | op.CurrentNeighborhoodIndexParameter.ActualName = "CurrentNeighborhoodIndex";
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| 308 | op.NeighborhoodCountParameter.ActualName = "NeighborhoodCount";
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| 309 | }
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[5642] | 310 | }
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| 311 | private void UpdateAnalyzers() {
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| 312 | Analyzer.Operators.Clear();
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| 313 | if (Problem != null) {
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| 314 | foreach (IAnalyzer analyzer in Problem.Operators.OfType<IAnalyzer>()) {
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| 315 | foreach (IScopeTreeLookupParameter param in analyzer.Parameters.OfType<IScopeTreeLookupParameter>())
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| 316 | param.Depth = 1;
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| 317 | Analyzer.Operators.Add(analyzer);
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| 318 | }
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| 319 | }
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| 320 | Analyzer.Operators.Add(qualityAnalyzer);
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| 321 | }
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| 322 | private VariableNeighborhoodSearchMainLoop FindMainLoop(IOperator start) {
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| 323 | IOperator mainLoop = start;
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| 324 | while (mainLoop != null && !(mainLoop is VariableNeighborhoodSearchMainLoop))
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| 325 | mainLoop = ((SingleSuccessorOperator)mainLoop).Successor;
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| 326 | if (mainLoop == null) return null;
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| 327 | else return (VariableNeighborhoodSearchMainLoop)mainLoop;
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| 328 | }
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| 329 | #endregion
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[5603] | 330 | }
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| 331 | }
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