1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022018 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 System;


23  using HeuristicLab.Common;


24  using HeuristicLab.Core;


25  using HeuristicLab.Data;


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


27 


28  namespace HeuristicLab.Encodings.RealVectorEncoding {


29  /// <summary>


30  /// Uniformly distributed change of a single position in a real vector.


31  /// </summary>


32  /// <remarks>


33  /// It is implemented as described in Michalewicz, Z. 1999. Genetic Algorithms + Data Structures = Evolution Programs. Third, Revised and Extended Edition, SpringVerlag Berlin Heidelberg.


34  /// </remarks>


35  [Item("UniformOnePositionManipulator", "Changes a single position in the vector by sampling uniformly from the interval [Minimum_i, Maximum_i) in dimension i. It is implemented as described in Michalewicz, Z. 1999. Genetic Algorithms + Data Structures = Evolution Programs. Third, Revised and Extended Edition, SpringVerlag Berlin Heidelberg.")]


36  [StorableClass]


37  public class UniformOnePositionManipulator : RealVectorManipulator {


38  [StorableConstructor]


39  protected UniformOnePositionManipulator(bool deserializing) : base(deserializing) { }


40  protected UniformOnePositionManipulator(UniformOnePositionManipulator original, Cloner cloner) : base(original, cloner) { }


41  public UniformOnePositionManipulator() : base() { }


42 


43  public override IDeepCloneable Clone(Cloner cloner) {


44  return new UniformOnePositionManipulator(this, cloner);


45  }


46 


47  /// <summary>


48  /// Changes randomly a single position in the given real <paramref name="vector"/>.


49  /// </summary>


50  /// <param name="random">A random number generator.</param>


51  /// <param name="vector">The real vector to manipulate.</param>


52  /// <param name="bounds">The lower and upper bound (1st and 2nd column) of the positions in the vector. If there are less rows than dimensions, the rows are cycled.</param>


53  public static void Apply(IRandom random, RealVector vector, DoubleMatrix bounds) {


54  int index = random.Next(vector.Length);


55  double min = bounds[index % bounds.Rows, 0];


56  double max = bounds[index % bounds.Rows, 1];


57  vector[index] = min + random.NextDouble() * (max  min);


58  }


59 


60  /// <summary>


61  /// Checks if the bounds parameters is available and forwards the call to <see cref="Apply(IRandom, RealVector, DoubleMatrix)"/>.


62  /// </summary>


63  /// <param name="random">The random number generator to use.</param>


64  /// <param name="realVector">The real vector to manipulate.</param>


65  protected override void Manipulate(IRandom random, RealVector realVector) {


66  if (BoundsParameter.ActualValue == null) throw new InvalidOperationException("MichalewiczNonUniformOnePositionManipulator: Parameter " + BoundsParameter.ActualName + " could not be found.");


67  Apply(random, realVector, BoundsParameter.ActualValue);


68  }


69  }


70  }

