1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2014 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 HeuristicLab.Common;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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25 | using HeuristicLab.Problems.VehicleRouting.Interfaces;
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26 |
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27 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
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28 | [Item("PotvinSequenceBasedCrossover", "The SBX crossover for a VRP representations. It is implemented as described in Potvin, J.-Y. and Bengio, S. (1996). The Vehicle Routing Problem with Time Windows - Part II: Genetic Search. INFORMS Journal of Computing, 8:165–172.")]
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29 | [StorableClass]
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30 | public sealed class PotvinSequenceBasedCrossover : PotvinCrossover {
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31 | [StorableConstructor]
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32 | private PotvinSequenceBasedCrossover(bool deserializing) : base(deserializing) { }
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33 |
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34 | public PotvinSequenceBasedCrossover()
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35 | : base() { }
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36 |
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37 | public override IDeepCloneable Clone(Cloner cloner) {
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38 | return new PotvinSequenceBasedCrossover(this, cloner);
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39 | }
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40 |
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41 | private PotvinSequenceBasedCrossover(PotvinSequenceBasedCrossover original, Cloner cloner)
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42 | : base(original, cloner) {
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43 | }
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44 |
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45 | public static PotvinEncoding Apply(IRandom random, PotvinEncoding parent1, PotvinEncoding parent2, IVRPProblemInstance problemInstance, bool allowInfeasible) {
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46 | PotvinEncoding child = parent1.Clone() as PotvinEncoding;
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47 | Tour newTour = new Tour();
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48 |
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49 | int cities = problemInstance.Cities.Value;
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50 |
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51 | if (cities > 0) {
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52 | int breakPoint1 = random.Next(1, cities + 1);
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53 | Tour tour1 = FindRoute(child, breakPoint1);
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54 | breakPoint1 = tour1.Stops.IndexOf(breakPoint1);
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55 |
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56 | for (int i = 0; i < breakPoint1; i++)
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57 | newTour.Stops.Add(tour1.Stops[i]);
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58 |
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59 | int breakPoint2 = random.Next(1, cities + 1);
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60 | Tour tour2 = FindRoute(parent2, breakPoint2);
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61 | breakPoint2 = tour2.Stops.IndexOf(breakPoint2);
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62 |
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63 | for (int i = breakPoint2; i < tour2.Stops.Count; i++)
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64 | newTour.Stops.Add(tour2.Stops[i]);
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65 |
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66 | int tour1Index = child.Tours.IndexOf(tour1);
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67 | child.Tours.Remove(tour1);
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68 | child.Tours.Insert(tour1Index, newTour);
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69 |
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70 | foreach (int city in tour1.Stops)
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71 | if (FindRoute(child, city) == null && !child.Unrouted.Contains(city))
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72 | child.Unrouted.Add(city);
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73 |
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74 | foreach (int city in tour2.Stops)
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75 | if (FindRoute(child, city) == null && !child.Unrouted.Contains(city))
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76 | child.Unrouted.Add(city);
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77 |
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78 | if (Repair(random, child, newTour, problemInstance, allowInfeasible) || allowInfeasible) {
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79 | return child;
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80 | } else {
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81 | if (random.NextDouble() < 0.5)
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82 | return parent1.Clone() as PotvinEncoding;
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83 | else
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84 | return parent2.Clone() as PotvinEncoding;
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85 | }
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86 | } else {
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87 | return child;
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88 | }
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89 | }
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90 |
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91 | protected override PotvinEncoding Crossover(IRandom random, PotvinEncoding parent1, PotvinEncoding parent2) {
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92 | return Apply(random, parent1, parent2, ProblemInstance, AllowInfeasibleSolutions.Value.Value);
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93 | }
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94 | }
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95 | }
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