| 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 HeuristicLab.Core;
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| 23 | using HeuristicLab.Data;
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| 24 | using HeuristicLab.Operators;
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| 25 | using HeuristicLab.Optimization;
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| 26 | using HeuristicLab.Parameters;
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| 27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 28 |
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| 29 | namespace HeuristicLab.Encodings.BinaryVectorEncoding {
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| 30 | [Item("OneBitflipMoveTabuChecker", "Prevents peforming a one bitflip move again.")]
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| 31 | [StorableClass]
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| 32 | public class OneBitflipMoveTabuChecker : SingleSuccessorOperator, IOneBitflipMoveOperator, ITabuChecker {
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| 33 | public override bool CanChangeName {
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| 34 | get { return false; }
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| 35 | }
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| 36 | public ILookupParameter<OneBitflipMove> OneBitflipMoveParameter {
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| 37 | get { return (LookupParameter<OneBitflipMove>)Parameters["OneBitflipMove"]; }
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| 38 | }
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| 39 | public ILookupParameter<BinaryVector> BinaryVectorParameter {
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| 40 | get { return (LookupParameter<BinaryVector>)Parameters["BinaryVector"]; }
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| 41 | }
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| 42 | public ILookupParameter<ItemList<IItem>> TabuListParameter {
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| 43 | get { return (ILookupParameter<ItemList<IItem>>)Parameters["TabuList"]; }
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| 44 | }
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| 45 | public ILookupParameter<BoolValue> MoveTabuParameter {
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| 46 | get { return (ILookupParameter<BoolValue>)Parameters["MoveTabu"]; }
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| 47 | }
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| 48 | public IValueLookupParameter<BoolValue> MaximizationParameter {
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| 49 | get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
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| 50 | }
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| 51 | public ILookupParameter<DoubleValue> MoveQualityParameter {
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| 52 | get { return (ILookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
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| 53 | }
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| 54 | public ValueParameter<BoolValue> UseAspirationCriterionParameter {
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| 55 | get { return (ValueParameter<BoolValue>)Parameters["UseAspirationCriterion"]; }
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| 56 | }
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| 57 |
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| 58 | public BoolValue UseAspirationCriterion {
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| 59 | get { return UseAspirationCriterionParameter.Value; }
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| 60 | set { UseAspirationCriterionParameter.Value = value; }
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| 61 | }
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| 62 |
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| 63 | public OneBitflipMoveTabuChecker()
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| 64 | : base() {
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| 65 | Parameters.Add(new LookupParameter<OneBitflipMove>("OneBitflipMove", "The move to evaluate."));
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| 66 | Parameters.Add(new LookupParameter<BoolValue>("MoveTabu", "The variable to store if a move was tabu."));
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| 67 | Parameters.Add(new LookupParameter<BinaryVector>("BinaryVector", "The solution as permutation."));
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| 68 | Parameters.Add(new LookupParameter<ItemList<IItem>>("TabuList", "The tabu list."));
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| 69 | Parameters.Add(new ValueParameter<BoolValue>("UseAspirationCriterion", "Whether to use the aspiration criterion or not.", new BoolValue(true)));
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| 70 | Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", "True if the problem is a maximization problem, else if it is a minimization problem."));
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| 71 | Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", "The quality of the current move."));
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| 72 | }
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| 73 |
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| 74 | public override IOperation Apply() {
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| 75 | ItemList<IItem> tabuList = TabuListParameter.ActualValue;
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| 76 | OneBitflipMove move = OneBitflipMoveParameter.ActualValue;
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| 77 | double moveQuality = MoveQualityParameter.ActualValue.Value;
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| 78 | bool maximization = MaximizationParameter.ActualValue.Value;
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| 79 | bool useAspiration = UseAspirationCriterion.Value;
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| 80 | bool isTabu = false;
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| 81 | foreach (IItem tabuMove in tabuList) {
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| 82 | OneBitflipMoveAttribute attribute = (tabuMove as OneBitflipMoveAttribute);
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| 83 | if (attribute != null) {
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| 84 | if (!useAspiration
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| 85 | || maximization && moveQuality <= attribute.MoveQuality
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| 86 | || !maximization && moveQuality >= attribute.MoveQuality) {
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| 87 | if (attribute.Index == move.Index) {
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| 88 | isTabu = true;
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| 89 | break;
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| 90 | }
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| 91 | }
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| 92 | }
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| 93 | }
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| 94 | MoveTabuParameter.ActualValue = new BoolValue(isTabu);
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| 95 | return base.Apply();
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| 96 | }
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| 97 | }
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| 98 | }
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