source: branches/2839_HiveProjectManagement/HeuristicLab.Encodings.RealVectorEncoding/3.3/Manipulators/UniformOnePositionManipulator.cs @ 16057

Last change on this file since 16057 was 16057, checked in by jkarder, 14 months ago

#2839:

File size: 3.6 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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
22using System;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace 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, Spring-Verlag 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, Spring-Verlag 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}
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