source: branches/GeneralizedQAP/HeuristicLab.Problems.GeneralizedQuadraticAssignment/3.3/Moves/NMoveTabuChecker.cs @ 15553

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2017 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
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 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
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 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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#endregion

using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Encodings.IntegerVectorEncoding;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Moves {
  [Item("N-Move TabuChecker", "Checks if a certain N-Move is tabu.")]
  [StorableClass]
  public class NMoveTabuChecker : SingleSuccessorOperator, ITabuChecker,
    IGQAPNMoveOperator, IMoveQualityAwareGQAPOperator {
    public override bool CanChangeName {
      get { return false; }
    }
    public IValueLookupParameter<BoolValue> MaximizationParameter {
      get { return (IValueLookupParameter<BoolValue>)Parameters["Maximization"]; }
    }
    public ILookupParameter<NMove> MoveParameter {
      get { return (ILookupParameter<NMove>)Parameters["Move"]; }
    }
    public ILookupParameter<IntegerVector> AssignmentParameter {
      get { return (ILookupParameter<IntegerVector>)Parameters["Assignment"]; }
    }
    public ILookupParameter<ItemList<IItem>> TabuListParameter {
      get { return (ILookupParameter<ItemList<IItem>>)Parameters["TabuList"]; }
    }
    public ILookupParameter<BoolValue> MoveTabuParameter {
      get { return (ILookupParameter<BoolValue>)Parameters["MoveTabu"]; }
    }
    public ILookupParameter<DoubleValue> MoveQualityParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["MoveQuality"]; }
    }
    public ILookupParameter<Evaluation> MoveEvaluationParameter {
      get { return (ILookupParameter<Evaluation>)Parameters["MoveEvaluation"]; }
    }
    public IValueParameter<BoolValue> UseAspirationCriterionParameter {
      get { return (IValueParameter<BoolValue>)Parameters["UseAspirationCriterion"]; }
    }

    public BoolValue UseAspirationCriterion {
      get { return UseAspirationCriterionParameter.Value; }
      set { UseAspirationCriterionParameter.Value = value; }
    }

    [StorableConstructor]
    protected NMoveTabuChecker(bool deserializing) : base(deserializing) { }
    protected NMoveTabuChecker(NMoveTabuChecker original, Cloner cloner) : base(original, cloner) { }
    public NMoveTabuChecker()
      : base() {
      Parameters.Add(new ValueLookupParameter<BoolValue>("Maximization", ""));
      Parameters.Add(new LookupParameter<NMove>("Move", GQAPNMoveGenerator.MoveDescription));
      Parameters.Add(new LookupParameter<IntegerVector>("Assignment", GQAPSolutionCreator.AssignmentDescription));
      Parameters.Add(new LookupParameter<ItemList<IItem>>("TabuList", "The tabu list contains previous move attributes."));
      Parameters.Add(new LookupParameter<BoolValue>("MoveTabu", "Declares if a move is tabu or not."));
      Parameters.Add(new LookupParameter<DoubleValue>("MoveQuality", GQAPNMoveEvaluator.MoveQualityDescription));
      Parameters.Add(new LookupParameter<Evaluation>("MoveEvaluation", GQAPNMoveEvaluator.MoveEvaluationDescription));
      Parameters.Add(new ValueParameter<BoolValue>("UseAspirationCriterion", "Whether moves can be aspired.", new BoolValue(true)));
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new NMoveTabuChecker(this, cloner);
    }

    public override IOperation Apply() {
      ItemList<IItem> tabuList = TabuListParameter.ActualValue;
      var move = MoveParameter.ActualValue;
      var assignment = AssignmentParameter.ActualValue;
      int length = assignment.Length;
      double moveQuality = MoveQualityParameter.ActualValue.Value;
      bool maximization = MaximizationParameter.ActualValue.Value;
      bool useAspiration = UseAspirationCriterion.Value;
      
      bool isTabu = EvaluateTabuState(tabuList, move, assignment, moveQuality, maximization, useAspiration);

      MoveTabuParameter.ActualValue = new BoolValue(isTabu);
      return base.Apply();
    }

    private bool EvaluateTabuState(ItemList<IItem> tabuList, NMove move, IntegerVector assignment, double moveQuality, bool maximization, bool useAspiration) {
      bool isTabu = false;
      foreach (var t in tabuList) {
        var attribute = (t as NMoveAbsoluteTabuAttribute);
        if (attribute == null) continue;
        if (!useAspiration
          || maximization && moveQuality <= attribute.MoveQuality
          || !maximization && moveQuality >= attribute.MoveQuality) {
          isTabu = true;
          foreach (var kvp in attribute.OldAssignments) {
            var assignedLoc = move.Reassignments[kvp.Item1] - 1; // location is given 1-based
            if (assignedLoc >= 0 && assignedLoc != kvp.Item2) {
              isTabu = false;
              break;
            }
          }
        }
        if (isTabu) break;
      }
      return isTabu;
    }
  }
}