1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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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.Encodings.PermutationEncoding;
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26 | using HeuristicLab.Optimization;
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27 | using HeuristicLab.Parameters;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 |
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30 | namespace HeuristicLab.Problems.PTSP {
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31 | [Item("Stochastic 2.5-SingleMoveGenerator", "Randomly samples a single from all possible inversion and shift moves (2.5-opt) from a given permutation.")]
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32 | [StorableClass]
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33 | public sealed class StochasticTwoPointFiveSingleMoveGenerator : TwoPointFiveMoveGenerator, IStochasticOperator, ISingleMoveGenerator {
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34 | public ILookupParameter<IRandom> RandomParameter {
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35 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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36 | }
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37 |
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38 | [StorableConstructor]
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39 | private StochasticTwoPointFiveSingleMoveGenerator(bool deserializing) : base(deserializing) { }
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40 | private StochasticTwoPointFiveSingleMoveGenerator(StochasticTwoPointFiveSingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
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41 | public StochasticTwoPointFiveSingleMoveGenerator()
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42 | : base() {
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43 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
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44 | }
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45 |
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46 | public override IDeepCloneable Clone(Cloner cloner) {
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47 | return new StochasticTwoPointFiveSingleMoveGenerator(this, cloner);
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48 | }
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49 |
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50 | public static TwoPointFiveMove Apply(Permutation permutation, IRandom random) {
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51 | int length = permutation.Length;
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52 | if (length == 1) throw new ArgumentException("Stochastic 2.5-SingleMoveGenerator: There cannot be an inversion move given a permutation of length 1.", "permutation");
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53 | int index1 = random.Next(length - 1);
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54 | int index2 = random.Next(index1 + 1, length);
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55 | if (permutation.PermutationType == PermutationTypes.RelativeUndirected) {
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56 | if (length > 3) {
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57 | while (index2 - index1 >= length - 2)
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58 | index2 = random.Next(index1 + 1, length);
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59 | }
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60 | }
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61 | bool isInvert = random.NextDouble() > 0.5;
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62 | return new TwoPointFiveMove(index1, index2, isInvert);
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63 |
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64 | }
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65 |
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66 | protected override TwoPointFiveMove[] GenerateMoves(Permutation permutation) {
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67 | return new[] { Apply(permutation, RandomParameter.ActualValue) };
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68 | }
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69 | }
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70 | }
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