1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)


4  *


5  * This file is part of HeuristicLab.


6  *


7  * HeuristicLab is free software: you can redistribute it and/or modify


8  * it under the terms of the GNU General Public License as published by


9  * the Free Software Foundation, either version 3 of the License, or


10  * (at your option) any later version.


11  *


12  * HeuristicLab is distributed in the hope that it will be useful,


13  * but WITHOUT ANY WARRANTY; without even the implied warranty of


14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the


15  * GNU General Public License for more details.


16  *


17  * You should have received a copy of the GNU General Public License


18  * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.


19  */


20  #endregion


21 


22  using HeuristicLab.Core;


23  using HeuristicLab.Data;


24  using HeuristicLab.Operators;


25  using HeuristicLab.Optimization;


26  using HeuristicLab.Parameters;


27  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;


28 


29  namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {


30  /// <summary>


31  /// A base class for operators that perform a crossover of realvalued vectors.


32  /// </summary>


33  [Item("RealVectorCrossover", "A base class for operators that perform a crossover of realvalued vectors.")]


34  [StorableClass]


35  public abstract class RealVectorCrossover : SingleSuccessorOperator, IRealVectorCrossover, IStochasticOperator {


36  public override bool CanChangeName {


37  get { return false; }


38  }


39 


40  public ILookupParameter<IRandom> RandomParameter {


41  get { return (LookupParameter<IRandom>)Parameters["Random"]; }


42  }


43  public ILookupParameter<ItemArray<RealVector>> ParentsParameter {


44  get { return (SubScopesLookupParameter<RealVector>)Parameters["Parents"]; }


45  }


46  public ILookupParameter<RealVector> ChildParameter {


47  get { return (ILookupParameter<RealVector>)Parameters["Child"]; }


48  }


49  public IValueLookupParameter<DoubleMatrix> BoundsParameter {


50  get { return (IValueLookupParameter<DoubleMatrix>)Parameters["Bounds"]; }


51  }


52 


53  protected RealVectorCrossover()


54  : base() {


55  Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic crossover operators."));


56  Parameters.Add(new SubScopesLookupParameter<RealVector>("Parents", "The parent vectors which should be crossed."));


57  Parameters.Add(new LookupParameter<RealVector>("Child", "The child vector resulting from the crossover."));


58  Parameters.Add(new ValueLookupParameter<DoubleMatrix>("Bounds", "The lower and upper bounds of the real vector."));


59  }


60 


61  public sealed override IOperation Apply() {


62  RealVector result = Cross(RandomParameter.ActualValue, ParentsParameter.ActualValue);


63  DoubleMatrix bounds = BoundsParameter.ActualValue;


64  if (bounds != null) BoundsChecker.Apply(result, bounds);


65  ChildParameter.ActualValue = result;


66  return base.Apply();


67  }


68 


69  protected abstract RealVector Cross(IRandom random, ItemArray<RealVector> parents);


70  }


71  }

