[6648] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[12969] | 3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[6648] | 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 System.Linq;
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| 24 | using HeuristicLab.Common;
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| 25 | using HeuristicLab.Core;
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| 26 | using HeuristicLab.Data;
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| 27 | using HeuristicLab.Optimization;
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| 28 | using HeuristicLab.Parameters;
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| 29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 30 |
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| 31 | namespace HeuristicLab.Encodings.PermutationEncoding {
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| 32 | [Item("StochasticScrambleMultiMoveGenerator", "Randomly samples n from all possible scramble moves from a given permutation.")]
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| 33 | [StorableClass]
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| 34 | public class StochasticScrambleMultiMoveGenerator : ScrambleMoveGenerator, IMultiMoveGenerator, IStochasticOperator {
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| 35 | public ILookupParameter<IRandom> RandomParameter {
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| 36 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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| 37 | }
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| 38 | public IValueLookupParameter<IntValue> SampleSizeParameter {
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| 39 | get { return (IValueLookupParameter<IntValue>)Parameters["SampleSize"]; }
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| 40 | }
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| 41 |
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| 42 | public IntValue SampleSize {
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| 43 | get { return SampleSizeParameter.Value; }
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| 44 | set { SampleSizeParameter.Value = value; }
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| 45 | }
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| 46 |
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| 47 | [StorableConstructor]
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| 48 | protected StochasticScrambleMultiMoveGenerator(bool deserializing) : base(deserializing) { }
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| 49 | protected StochasticScrambleMultiMoveGenerator(StochasticScrambleMultiMoveGenerator original, Cloner cloner) : base(original, cloner) { }
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| 50 | public StochasticScrambleMultiMoveGenerator()
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| 51 | : base() {
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| 52 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
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| 53 | Parameters.Add(new ValueLookupParameter<IntValue>("SampleSize", "The number of moves to generate."));
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| 54 | }
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| 55 |
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| 56 | public override IDeepCloneable Clone(Cloner cloner) {
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| 57 | return new StochasticScrambleMultiMoveGenerator(this, cloner);
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| 58 | }
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| 59 |
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| 60 | public static ScrambleMove GenerateRandomMove(Permutation permutation, IRandom random) {
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| 61 | int breakPoint1, breakPoint2;
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| 62 | int[] scrambledIndices;
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| 63 |
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| 64 | breakPoint1 = random.Next(permutation.Length);
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| 65 | do {
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| 66 | breakPoint2 = random.Next(permutation.Length);
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| 67 | } while (Math.Abs(breakPoint2 - breakPoint1) <= 1);
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| 68 | if (breakPoint2 < breakPoint1) { int h = breakPoint1; breakPoint1 = breakPoint2; breakPoint2 = h; }
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| 69 |
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| 70 | scrambledIndices = new int[breakPoint2 - breakPoint1 + 1];
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| 71 | for (int i = 0; i < scrambledIndices.Length; i++)
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| 72 | scrambledIndices[i] = i;
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| 73 | bool[] moved = new bool[scrambledIndices.Length];
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| 74 | bool changed = false;
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| 75 | do {
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| 76 | for (int i = scrambledIndices.Length - 1; i > 0; i--) {
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| 77 | int j = random.Next(i + 1);
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| 78 | int t = scrambledIndices[j];
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| 79 | scrambledIndices[j] = scrambledIndices[i];
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| 80 | scrambledIndices[i] = t;
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| 81 | if (scrambledIndices[j] == j) moved[j] = false;
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| 82 | else moved[j] = true;
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| 83 | if (scrambledIndices[i] == i) moved[i] = false;
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| 84 | else moved[i] = true;
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| 85 | }
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| 86 | changed = moved.Any(x => x);
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| 87 | } while (!changed);
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| 88 |
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| 89 | return new ScrambleMove(breakPoint1, scrambledIndices);
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| 90 | }
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| 91 |
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| 92 | public static ScrambleMove[] Apply(Permutation permutation, IRandom random, int sampleSize) {
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| 93 | int length = permutation.Length;
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| 94 | ScrambleMove[] moves = new ScrambleMove[sampleSize];
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| 95 | for (int i = 0; i < sampleSize; i++) {
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| 96 | moves[i] = GenerateRandomMove(permutation, random);
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| 97 | }
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| 98 | return moves;
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| 99 | }
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| 100 |
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| 101 | protected override ScrambleMove[] GenerateMoves(Permutation permutation) {
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| 102 | IRandom random = RandomParameter.ActualValue;
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| 103 | return Apply(permutation, random, SampleSizeParameter.ActualValue.Value);
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| 104 | }
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| 105 | }
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| 106 | }
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