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 System.Linq;
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24 | using HeuristicLab.Common;
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25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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26 |
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27 | namespace HeuristicLab.Problems.DataAnalysis {
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28 | /// <summary>
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29 | /// Base class for weight calculators for classification solutions in an ensemble.
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30 | /// </summary>
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31 | [StorableClass]
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32 | public abstract class DiscriminantClassificationWeightCalculator : ClassificationWeightCalculator {
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33 | [StorableConstructor]
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34 | protected DiscriminantClassificationWeightCalculator(bool deserializing) : base(deserializing) { }
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35 | protected DiscriminantClassificationWeightCalculator(DiscriminantClassificationWeightCalculator original, Cloner cloner)
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36 | : base(original, cloner) {
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37 | }
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38 | public DiscriminantClassificationWeightCalculator()
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39 | : base() {
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40 | }
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41 |
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42 | protected override IEnumerable<double> CalculateWeights(IEnumerable<IClassificationSolution> classificationSolutions) {
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43 | if (!classificationSolutions.All(x => x is IDiscriminantFunctionClassificationSolution))
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44 | return Enumerable.Repeat<double>(1.0, classificationSolutions.Count());
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45 |
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46 | IEnumerable<IDiscriminantFunctionClassificationSolution> discriminantSolutions = classificationSolutions.Cast<IDiscriminantFunctionClassificationSolution>();
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47 |
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48 | return DiscriminantCalculateWeights(discriminantSolutions);
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49 | }
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50 |
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51 | protected abstract IEnumerable<double> DiscriminantCalculateWeights(IEnumerable<IDiscriminantFunctionClassificationSolution> discriminantSolutions);
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52 |
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53 | public override IEnumerable<double> AggregateEstimatedClassValues(IEnumerable<IClassificationSolution> solutions, Dataset dataset, IEnumerable<int> rows, CheckPoint handler) {
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54 | if (!solutions.All(x => x is IDiscriminantFunctionClassificationSolution))
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55 | return Enumerable.Repeat<double>(double.NaN, rows.Count());
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56 |
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57 | IEnumerable<IDiscriminantFunctionClassificationSolution> discriminantSolutions = solutions.Cast<IDiscriminantFunctionClassificationSolution>();
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58 |
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59 | IEnumerable<IDictionary<IClassificationSolution, double>> estimatedClassValues = GetEstimatedClassValues(solutions, dataset, rows, handler);
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60 | IEnumerable<IDictionary<IDiscriminantFunctionClassificationSolution, double>> estimatedValues = GetEstimatedValues(discriminantSolutions, dataset, rows, handler);
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61 |
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62 | return from zip in estimatedClassValues.Zip(estimatedValues, (classValues, values) => new { ClassValues = classValues, Values = values })
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63 | select DiscriminantAggregateEstimatedClassValues(zip.ClassValues, zip.Values);
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64 | }
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65 |
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66 | protected virtual double DiscriminantAggregateEstimatedClassValues(IDictionary<IClassificationSolution, double> estimatedClassValues, IDictionary<IDiscriminantFunctionClassificationSolution, double> estimatedValues) {
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67 | return base.AggregateEstimatedClassValues(estimatedClassValues);
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68 | }
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69 |
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70 | protected IEnumerable<IDictionary<IDiscriminantFunctionClassificationSolution, double>> GetEstimatedValues(IEnumerable<IDiscriminantFunctionClassificationSolution> solutions, Dataset dataset, IEnumerable<int> rows, CheckPoint handler) {
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71 | var estimatedValuesEnumerators = (from solution in solutions
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72 | select new { Solution = solution, EstimatedValuesEnumerator = solution.Model.GetEstimatedValues(dataset, rows).GetEnumerator() })
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73 | .ToList();
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74 |
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75 | var rowEnumerator = rows.GetEnumerator();
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76 | while (rowEnumerator.MoveNext() && estimatedValuesEnumerators.All(x => x.EstimatedValuesEnumerator.MoveNext())) {
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77 | yield return (from enumerator in estimatedValuesEnumerators
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78 | where handler(enumerator.Solution.ProblemData, rowEnumerator.Current)
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79 | select enumerator)
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80 | .ToDictionary(x => x.Solution, x => x.EstimatedValuesEnumerator.Current);
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81 | }
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82 | }
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83 |
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84 | public sealed override double GetConfidence(IEnumerable<IClassificationSolution> solutions, int index, double estimatedClassValue, CheckPoint handler) {
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85 | if (solutions.Count() < 1 || !solutions.All(x => x is IDiscriminantFunctionClassificationSolution))
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86 | return double.NaN;
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87 |
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88 | IEnumerable<IDiscriminantFunctionClassificationSolution> discriminantSolutions = solutions.Cast<IDiscriminantFunctionClassificationSolution>();
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89 |
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90 | return GetDiscriminantConfidence(discriminantSolutions, index, estimatedClassValue, handler);
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91 | }
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92 |
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93 | protected virtual double GetDiscriminantConfidence(IEnumerable<IDiscriminantFunctionClassificationSolution> solutions, int index, double estimatedClassValue, CheckPoint handler) {
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94 | return base.GetConfidence(solutions, index, estimatedClassValue, handler);
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95 | }
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96 |
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97 | public sealed override IEnumerable<double> GetConfidence(IEnumerable<IClassificationSolution> solutions, IEnumerable<int> indices, IEnumerable<double> estimatedClassValue, CheckPoint handler) {
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98 | if (solutions.Count() < 1 || !solutions.All(x => x is IDiscriminantFunctionClassificationSolution))
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99 | return Enumerable.Repeat(double.NaN, indices.Count());
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100 |
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101 | IEnumerable<IDiscriminantFunctionClassificationSolution> discriminantSolutions = solutions.Cast<IDiscriminantFunctionClassificationSolution>();
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102 |
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103 | return GetDiscriminantConfidence(discriminantSolutions, indices, estimatedClassValue, handler);
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104 | }
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105 |
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106 | public virtual IEnumerable<double> GetDiscriminantConfidence(IEnumerable<IDiscriminantFunctionClassificationSolution> solutions, IEnumerable<int> indices, IEnumerable<double> estimatedClassValue, CheckPoint handler) {
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107 | return base.GetConfidence(solutions, indices, estimatedClassValue, handler);
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108 | }
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109 | }
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110 | }
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