[4174] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 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.Core;
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| 23 | using HeuristicLab.Encodings.PermutationEncoding;
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| 24 | using HeuristicLab.Parameters;
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| 25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 26 | using HeuristicLab.Data;
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| 27 | using HeuristicLab.Optimization;
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| 28 |
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| 29 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
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[4179] | 30 | [Item("PotvinManipulator", "A VRP manipulation operation on a Potvin encoding.")]
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[4174] | 31 | [StorableClass]
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| 32 | public abstract class PotvinManipulator : VRPManipulator, IStochasticOperator {
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| 33 | public ILookupParameter<IRandom> RandomParameter {
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| 34 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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| 35 | }
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| 36 |
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[4179] | 37 | [StorableConstructor]
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| 38 | protected PotvinManipulator(bool deserializing) : base(deserializing) { }
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| 39 |
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[4174] | 40 | public PotvinManipulator() {
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| 41 | Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic manipulation operators."));
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| 42 | }
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| 43 |
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| 44 | protected abstract void Manipulate(IRandom random, PotvinEncoding individual);
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| 45 |
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| 46 | protected int SelectRandomTourBiasedByLength(IRandom random, PotvinEncoding individual) {
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| 47 | int tourIndex = -1;
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| 48 |
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| 49 | double sum = 0.0;
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| 50 | double[] probabilities = new double[individual.Tours.Count];
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| 51 | for (int i = 0; i < individual.Tours.Count; i++) {
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| 52 | probabilities[i] = 1.0 / ((double)individual.Tours[i].Cities.Count / (double)Cities);
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| 53 | sum += probabilities[i];
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| 54 | }
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| 55 |
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| 56 | for (int i = 0; i < probabilities.Length; i++)
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| 57 | probabilities[i] = probabilities[i] / sum;
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| 58 |
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| 59 | double rand = random.NextDouble();
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| 60 | double cumulatedProbabilities = 0.0;
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| 61 | int index = 0;
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| 62 | while (tourIndex == -1 && index < probabilities.Length) {
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| 63 | if (cumulatedProbabilities <= rand && rand <= cumulatedProbabilities + probabilities[index])
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| 64 | tourIndex = index;
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| 65 |
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| 66 | cumulatedProbabilities += probabilities[index];
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| 67 | index++;
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| 68 | }
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| 69 |
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| 70 | return tourIndex;
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| 71 | }
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| 72 |
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| 73 | protected bool FindInsertionPlace(PotvinEncoding individual, int city, int routeToAvoid, out int route, out int place) {
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| 74 | return individual.FindInsertionPlace(
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| 75 | DueTimeParameter.ActualValue, ServiceTimeParameter.ActualValue, ReadyTimeParameter.ActualValue,
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| 76 | DemandParameter.ActualValue, CapacityParameter.ActualValue, CoordinatesParameter.ActualValue,
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| 77 | DistanceMatrixParameter, UseDistanceMatrixParameter.ActualValue,
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| 78 | city, routeToAvoid, out route, out place);
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| 79 | }
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| 80 |
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| 81 | public override IOperation Apply() {
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[4179] | 82 | IVRPEncoding solution = VRPToursParameter.ActualValue;
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[4174] | 83 | if (!(solution is PotvinEncoding)) {
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[4179] | 84 | VRPToursParameter.ActualValue = PotvinEncoding.ConvertFrom(solution);
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[4174] | 85 | }
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| 86 |
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[4179] | 87 | Manipulate(RandomParameter.ActualValue, VRPToursParameter.ActualValue as PotvinEncoding);
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[4174] | 88 |
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| 89 | return base.Apply();
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| 90 | }
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| 91 | }
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| 92 | }
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