[8017] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[14185] | 3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[8017] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Data;
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| 26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 27 |
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| 28 | namespace HeuristicLab.Encodings.IntegerVectorEncoding {
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| 29 | /// <summary>
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| 30 | /// Rounded average crossover for integer vectors.
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| 31 | /// </summary>
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| 32 | [Item("RoundedAverageCrossover", "Average crossover for integer vectors.")]
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| 33 | [StorableClass]
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| 34 | public class RoundedAverageCrossover : BoundedIntegerVectorCrossover, IBoundedIntegerVectorOperator {
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| 35 |
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| 36 | [StorableConstructor]
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| 37 | protected RoundedAverageCrossover(bool deserializing) : base(deserializing) { }
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| 38 | protected RoundedAverageCrossover(RoundedAverageCrossover original, Cloner cloner) : base(original, cloner) { }
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| 39 | public RoundedAverageCrossover() : base() { }
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| 40 |
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| 41 | public override IDeepCloneable Clone(Cloner cloner) {
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| 42 | return new RoundedAverageCrossover(this, cloner);
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| 43 | }
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| 44 |
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| 45 | /// <summary>
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| 46 | /// Performs an average crossover of the two given parent integer vectors.
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| 47 | /// The average is rounded and mapped to the nearest valid value (e.g. if step size is > 1)
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| 48 | /// </summary>
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| 49 | /// <param name="random">A random number generator.</param>
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| 50 | /// <param name="parents">The parents for crossover.</param>
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| 51 | /// <param name="bounds">The bounds matrix that contains for each dimension one row with minimum (inclusive), maximum (exclusive), and step size columns.
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| 52 | /// If the number of rows is smaller than the number of dimensions the matrix is cycled.</param>
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| 53 | /// <returns>The newly created integer vector, resulting from the single point crossover.</returns>
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| 54 | public static IntegerVector Apply(IRandom random, ItemArray<IntegerVector> parents, IntMatrix bounds) {
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| 55 | int length = parents[0].Length, parentsCount = parents.Length;
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| 56 | if (parents.Length < 2) throw new ArgumentException("RoundedAverageCrossover: The number of parents is less than 2.", "parents");
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| 57 | if (bounds == null || bounds.Rows < 1 || bounds.Columns < 2) throw new ArgumentException("AverageCrossover: Invalid bounds specified.", "bounds");
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| 58 |
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| 59 | var result = new IntegerVector(length);
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| 60 | try {
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| 61 | double avg;
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| 62 | for (int i = 0; i < length; i++) {
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| 63 | avg = 0;
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| 64 | for (int j = 0; j < parentsCount; j++)
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| 65 | avg += parents[j][i];
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| 66 | avg /= parentsCount;
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| 67 | int min = bounds[i % bounds.Rows, 0], max = bounds[i % bounds.Rows, 1], step = 1;
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| 68 | if (bounds.Columns > 2) step = bounds[i % bounds.Rows, 2];
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[8790] | 69 | max = FloorFeasible(min, max, step, max - 1);
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[8017] | 70 | result[i] = RoundFeasible(min, max, step, avg);
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| 71 | }
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| 72 | } catch (IndexOutOfRangeException) {
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| 73 | throw new ArgumentException("RoundedAverageCrossover: The parents' vectors are of different length.", "parents");
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| 74 | }
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| 75 |
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| 76 | return result;
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| 77 | }
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| 78 |
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| 79 | /// <summary>
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| 80 | /// Performs an average crossover between two parent integer vectors.
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| 81 | /// </summary>
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| 82 | /// <exception cref="ArgumentException">Thrown if there are not exactly two parents.</exception>
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| 83 | /// <param name="random">A random number generator.</param>
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| 84 | /// <param name="parents">An array containing the two integer vectors that should be crossed.</param>
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| 85 | /// <param name="bounds">The bounds and step size for each dimension (will be cycled in case there are less rows than elements in the parent vectors).</param>
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| 86 | /// <returns>The newly created integer vector, resulting from the average crossover.</returns>
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| 87 | protected override IntegerVector CrossBounded(IRandom random, ItemArray<IntegerVector> parents, IntMatrix bounds) {
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| 88 | return Apply(random, parents, bounds);
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| 89 | }
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| 90 | }
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| 91 | }
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