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.Operators;
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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.Optimization.Operators.LCS {
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31 | [Item("ILASOperator", "Description missing")]
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32 | [StorableClass]
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33 | public class ILASOperator : SingleSuccessorOperator, IStochasticOperator {
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34 |
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35 | #region Parameter Properties
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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<IGAssistNichesProblemData> ProblemDataParameter {
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40 | get { return (ILookupParameter<IGAssistNichesProblemData>)Parameters["ProblemData"]; }
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41 | }
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42 | public IValueLookupParameter<IntValue> NumberOfStrataParameter {
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43 | get { return (IValueLookupParameter<IntValue>)Parameters["NumberOfStrata"]; }
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44 | }
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45 | public IValueLookupParameter<ItemList<ItemList<IntValue>>> StrataParameter {
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46 | get { return (IValueLookupParameter<ItemList<ItemList<IntValue>>>)Parameters["Strata"]; }
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47 | }
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48 | #endregion
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49 |
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50 | [StorableConstructor]
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51 | protected ILASOperator(bool deserializing) : base(deserializing) { }
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52 | protected ILASOperator(ILASOperator original, Cloner cloner)
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53 | : base(original, cloner) {
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54 | }
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55 | public ILASOperator()
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56 | : base() {
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57 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random generator to use."));
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58 | Parameters.Add(new LookupParameter<IGAssistNichesProblemData>("ProblemData", ""));
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59 | Parameters.Add(new ValueLookupParameter<IntValue>("NumberOfStrata", ""));
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60 | Parameters.Add(new ValueLookupParameter<ItemList<ItemList<IntValue>>>("Strata", ""));
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61 | }
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62 | public override IDeepCloneable Clone(Cloner cloner) {
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63 | return new ILASOperator(this, cloner);
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64 | }
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65 |
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66 | public override IOperation Apply() {
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67 | if (StrataParameter.ActualValue == null) {
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68 | //initialize strata
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69 | int numberOfStrata = NumberOfStrataParameter.ActualValue.Value;
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70 | var strata = new ItemList<ItemList<IntValue>>(numberOfStrata);
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71 | for (int i = 0; i < numberOfStrata; i++) {
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72 | strata.Add(new ItemList<IntValue>());
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73 | }
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74 |
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75 | //get all rows for every niche
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76 | var problemData = ProblemDataParameter.ActualValue;
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77 | IntRange evaluate = ProblemDataParameter.ActualValue.TrainingPartition;
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78 | Dictionary<IGAssistNiche, List<int>> nicheRows = null;
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79 | for (int row = evaluate.Start; row < evaluate.End; row++) {
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80 | if (problemData.IsTrainingSample(row)) {
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81 | var niche = problemData.FetchAction(row);
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82 | if (nicheRows == null) {
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83 | nicheRows = new Dictionary<IGAssistNiche, List<int>>(niche.Comparer);
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84 | }
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85 | if (!nicheRows.ContainsKey(niche)) {
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86 | nicheRows.Add(niche, new List<int>());
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87 | }
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88 | nicheRows[niche].Add(row);
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89 | }
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90 | }
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91 |
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92 | //distribute niches to strata
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93 | var random = RandomParameter.ActualValue;
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94 | foreach (var niche in nicheRows.Keys) {
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95 | var rows = nicheRows[niche];
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96 | int count = 0;
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97 | while (rows.Count > 0) {
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98 | int pos = random.Next(rows.Count);
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99 | strata[count % numberOfStrata].Add(new IntValue(rows[pos]));
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100 | rows.RemoveAt(pos);
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101 | count++;
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102 | }
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103 | }
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104 |
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105 | StrataParameter.ActualValue = strata;
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106 | }
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107 | return base.Apply();
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108 | }
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109 | }
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110 | }
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