source: branches/GP-MoveOperators/HeuristicLab.Problems.DataAnalysis.Symbolic.Regression/3.4/ReplaceBranchMoveTabuMaker.cs @ 10429

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Optimization.Operators;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Regression {
  [Item("ReplaceBranchMoveTabuMaker", "")]
  [StorableClass]
  public class ReplaceBranchMoveTabuMaker : TabuMaker, ISymbolicExpressionTreeMoveOperator {
    public ILookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {
      get { return (ILookupParameter<ISymbolicExpressionTree>)Parameters["SymbolicExpressionTree"]; }
    }
    public ILookupParameter<ReplaceBranchMove> ReplaceBranchMoveParameter {
      get { return (LookupParameter<ReplaceBranchMove>)Parameters["ReplaceBranchMove"]; }
    }

    [StorableConstructor]
    protected ReplaceBranchMoveTabuMaker(bool deserializing) : base(deserializing) { }
    protected ReplaceBranchMoveTabuMaker(ReplaceBranchMoveTabuMaker original, Cloner cloner) : base(original, cloner) { }
    public ReplaceBranchMoveTabuMaker()
      : base() {
      Parameters.Add(new LookupParameter<ReplaceBranchMove>("ReplaceBranchMove", "The move that was made."));
      Parameters.Add(new LookupParameter<ISymbolicExpressionTree>("SymbolicExpressionTree", "The solution as symbolic expression tree."));
    }

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

    protected override IItem GetTabuAttribute(bool maximization, double quality, double moveQuality) {
      var move = ReplaceBranchMoveParameter.ActualValue;
      var tree = SymbolicExpressionTreeParameter.ActualValue;
      double aspirationThreshold = moveQuality;
      if (maximization && quality > moveQuality || !maximization && quality < moveQuality) aspirationThreshold = quality; // if we make a bad move, the aspriation threshold is the solution quality

      List<int> path = new List<int>();
      path.Add(move.SubtreeIndex);
      var parent = move.Parent.Parent;
      var child = move.Parent;
      while (parent != null) {
        path.Add(parent.IndexOfSubtree(child));
        child = parent;
        parent = parent.Parent;
      }
      path.Reverse();
      return new ChangeNodeTypeMoveAbsoluteAttribute(path.ToArray(), aspirationThreshold, move.OriginalOutput, move.NewOutput);
    }
  }
}