1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2012 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.Collections.Generic;
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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.Encodings.IntegerVectorEncoding;
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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.Problems.GeneralizedQuadraticAssignment {
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32 | [Item("Stochastic 1-move and 2-move SingleMoveGenerator", "Randomly samples a single 1-move or 2-move as described in Mateus, G., Resende, M., and Silva, R. 2011. GRASP with path-relinking for the generalized quadratic assignment problem. Journal of Heuristics 17, Springer Netherlands, pp. 527-565.")]
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33 | [StorableClass]
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34 | public class StochasticNMoveSingleMoveGenerator : GQAPNMoveGenerator, ILocationAwareGQAPOperator, ISingleMoveGenerator, IStochasticOperator {
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35 |
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36 | public ILookupParameter<IRandom> RandomParameter {
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37 | get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
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38 | }
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39 | public ILookupParameter<DoubleArray> CapacitiesParameter {
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40 | get { return (ILookupParameter<DoubleArray>)Parameters["Capacities"]; }
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41 | }
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42 |
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43 | [StorableConstructor]
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44 | protected StochasticNMoveSingleMoveGenerator(bool deserializing) : base(deserializing) { }
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45 | protected StochasticNMoveSingleMoveGenerator(StochasticNMoveSingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
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46 | public StochasticNMoveSingleMoveGenerator()
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47 | : base() {
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48 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator that should be used."));
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49 | Parameters.Add(new LookupParameter<DoubleArray>("Capacities", "Capacities of the locations."));
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50 | }
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51 |
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52 | public override IDeepCloneable Clone(Cloner cloner) {
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53 | return new StochasticNMoveSingleMoveGenerator(this, cloner);
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54 | }
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55 |
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56 | public static NMove Generate(IRandom random, IntegerVector assignment, int n, DoubleArray capacities) {
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57 | int moving = random.Next(n) + 1;
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58 | int[] equipments = new int[moving], locations = new int[moving];
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59 | HashSet<int> chosenEquipments = new HashSet<int>();
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60 | for (int i = 0; i < moving; i++) {
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61 | do {
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62 | equipments[i] = random.Next(assignment.Length);
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63 | } while (chosenEquipments.Contains(equipments[i]));
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64 | chosenEquipments.Add(equipments[i]);
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65 | do {
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66 | locations[i] = random.Next(capacities.Length);
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67 | } while (locations[i] == assignment[equipments[i]]);
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68 | }
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69 | return new NMove(equipments, locations);
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70 | }
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71 |
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72 | public override IEnumerable<NMove> GenerateMoves(IntegerVector assignment, int n) {
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73 | yield return Generate(RandomParameter.ActualValue, assignment, n, CapacitiesParameter.ActualValue);
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74 | }
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75 | }
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76 | }
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