1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 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;
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23 | using System.Collections;
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24 | using System.Collections.Generic;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Data;
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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.Algorithms.DataAnalysis {
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32 | [StorableClass]
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33 | public abstract class KernelBase<T> : ParameterizedNamedItem, IKernelFunction<T> {
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34 |
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35 | #region Parameternames
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36 | private const string DistanceParameterName = "Distance";
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37 | protected const string BetaParameterName = "Beta";
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38 | #endregion
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39 | #region Parameterproperties
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40 | public ValueParameter<IDistance<T>> DistanceParameter
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41 | {
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42 | get { return Parameters[DistanceParameterName] as ValueParameter<IDistance<T>>; }
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43 | }
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44 |
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45 | public IFixedValueParameter<DoubleValue> BetaParameter
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46 | {
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47 | get { return Parameters[BetaParameterName] as FixedValueParameter<DoubleValue>; }
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48 | }
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49 |
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50 | #endregion
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51 | #region Properties
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52 | public IDistance<T> Distance
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53 | {
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54 | get { return DistanceParameter.Value; }
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55 | }
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56 |
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57 | public double Beta
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58 | {
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59 | get { return BetaParameter.Value.Value; }
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60 | }
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61 |
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62 | #endregion
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63 |
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64 | #region HLConstructors & Boilerplate
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65 | [StorableConstructor]
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66 | protected KernelBase(bool deserializing) : base(deserializing) { }
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67 | [StorableHook(HookType.AfterDeserialization)]
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68 | private void AfterDeserialization() { }
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69 |
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70 | protected KernelBase(KernelBase<T> original, Cloner cloner)
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71 | : base(original, cloner) { }
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72 |
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73 | protected KernelBase() {
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74 | Parameters.Add(new ValueParameter<IDistance<T>>(DistanceParameterName, "The distance function used for kernel calculation"));
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75 | DistanceParameter.Value = new EuclidianDistance() as IDistance<T>;
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76 | }
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77 | #endregion
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78 |
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79 | public double Get(T a, T b) {
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80 | return Get(Distance.Get(a, b));
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81 | }
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82 |
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83 | protected abstract double Get(double norm);
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84 |
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85 | public int GetNumberOfParameters(int numberOfVariables) {
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86 | return 1;
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87 | }
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88 |
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89 | public void SetParameter(double[] p) {
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90 | if (p != null && p.Length == 1) BetaParameter.Value.Value = p[0];
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91 | }
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92 |
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93 | public ParameterizedCovarianceFunction GetParameterizedCovarianceFunction(double[] p, int[] columnIndices) {
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94 | if (p == null || p.Length != 1) throw new ArgumentException("Illegal parametrization");
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95 | var myClone = (KernelBase<T>)Clone(new Cloner());
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96 | myClone.BetaParameter.Value.Value = p[0];
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97 | var cov = new ParameterizedCovarianceFunction {
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98 | Covariance = (x, i, j) => myClone.Get(GetNorm(x, x, i, j, columnIndices)),
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99 | CrossCovariance = (x, xt, i, j) => myClone.Get(GetNorm(x, xt, i, j, columnIndices)),
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100 | CovarianceGradient = (x, i, j) => new List<double> { myClone.GetGradient(GetNorm(x, x, i, j, columnIndices)) }
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101 | };
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102 | return cov;
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103 | }
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104 |
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105 | protected abstract double GetGradient(double norm);
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106 |
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107 | protected double GetNorm(double[,] x, double[,] xt, int i, int j, int[] columnIndices) {
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108 | var dist = Distance as IDistance<IEnumerable<double>>;
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109 | if (dist == null) throw new ArgumentException("The Distance needs to apply to double-Vectors");
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110 | var r1 = new IndexedEnumerable(x, i, columnIndices);
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111 | var r2 = new IndexedEnumerable(xt, j, columnIndices);
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112 | return dist.Get(r1, r2);
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113 | }
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114 | internal class IndexedEnumerable : IEnumerable<double> {
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115 | private readonly double[,] data;
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116 | private readonly int row;
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117 | private readonly int[] columnIndices;
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118 |
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119 | public IndexedEnumerable(double[,] data, int row, int[] columnIndices) {
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120 | this.data = data;
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121 | this.row = row;
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122 | this.columnIndices = columnIndices;
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123 | }
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124 |
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125 | public IEnumerator<double> GetEnumerator() {
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126 | return new IndexedEnumerator(data, row, columnIndices);
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127 | }
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128 |
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129 | IEnumerator IEnumerable.GetEnumerator() {
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130 | return new IndexedEnumerator(data, row, columnIndices);
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131 | }
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132 | }
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133 | internal class IndexedEnumerator : IEnumerator<double> {
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134 | private readonly IEnumerator<int> column;
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135 | private readonly double[,] data;
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136 | private readonly int row;
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137 |
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138 | public IndexedEnumerator(double[,] data, int row, int[] columnIndices) {
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139 | this.data = data;
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140 | this.row = row;
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141 | column = ((IEnumerable<int>)columnIndices).GetEnumerator();
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142 | }
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143 |
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144 | public double Current
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145 | {
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146 | get { return data[row, column.Current]; }
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147 | }
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148 |
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149 | object IEnumerator.Current
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150 | {
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151 | get
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152 | {
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153 | return data[row, column.Current];
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154 | }
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155 | }
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156 |
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157 | public void Dispose() { }
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158 |
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159 | public bool MoveNext() {
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160 | return column.MoveNext();
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161 | }
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162 |
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163 | public void Reset() {
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164 | column.Reset();
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165 | }
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166 | }
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167 | }
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168 | } |
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