1 | #ifndef _theplu_yat_classifier_matrix_lookup_weighted_ |
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2 | #define _theplu_yat_classifier_matrix_lookup_weighted_ |
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3 | |
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4 | // $Id$ |
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5 | |
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6 | /* |
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7 | Copyright (C) 2006 Jari Häkkinen, Markus Ringnér, Peter Johansson |
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8 | Copyright (C) 2007 Jari Häkkinen, Peter Johansson |
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9 | |
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10 | This file is part of the yat library, http://trac.thep.lu.se/yat |
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11 | |
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12 | The yat library is free software; you can redistribute it and/or |
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13 | modify it under the terms of the GNU General Public License as |
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14 | published by the Free Software Foundation; either version 2 of the |
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15 | License, or (at your option) any later version. |
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16 | |
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17 | The yat library is distributed in the hope that it will be useful, |
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18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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20 | General Public License for more details. |
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21 | |
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22 | You should have received a copy of the GNU General Public License |
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23 | along with this program; if not, write to the Free Software |
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24 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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25 | 02111-1307, USA. |
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26 | */ |
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27 | |
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28 | #include "DataLookup2D.h" |
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29 | |
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30 | #include <iostream> |
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31 | #include <vector> |
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32 | |
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33 | namespace theplu { |
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34 | namespace yat { |
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35 | |
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36 | namespace utility { |
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37 | class matrix; |
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38 | } |
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39 | |
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40 | namespace classifier { |
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41 | |
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42 | class MatrixLookup; |
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43 | |
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44 | /// |
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45 | /// @brief Class viewing into data and weight matrix. |
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46 | /// |
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47 | /// A MatrixLookupWeighted is very similar to a MatrixLookup, but |
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48 | /// contains a pointer to a weight matrix as well meaning each data |
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49 | /// element is associated to a weight. |
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50 | /// |
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51 | /// A MatrixLookupWeighted can be created directly from a matrix or |
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52 | /// from an other MatrixLookupWeighted. In the latter case, the |
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53 | /// resulting MatrixLookupWeighted is looking directly into the |
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54 | /// underlying matrix to avoid multiple lookups. |
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55 | /// |
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56 | /// There is a possibility to set the MatrixLookupWeighted as owner |
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57 | /// of the underlying matrices (data and weight). |
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58 | /// This implies that underlying data is deleted |
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59 | /// in destructor of MatrixLookupWeighted, but only if there is no other |
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60 | /// owner of the underlying data. A reference counter is used to |
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61 | /// keep track of number of owners. Ownership is copied in copy |
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62 | /// constructors and assignments. |
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63 | /// |
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64 | class MatrixLookupWeighted : public DataLookup2D |
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65 | { |
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66 | |
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67 | public: |
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68 | |
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69 | |
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70 | /// |
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71 | /// Constructor creating a lookup into the entire \a matrix and \a |
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72 | /// weights. |
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73 | /// |
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74 | /// @note If @a matrix or @a weights goes out of scope or is |
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75 | /// deleted, the MatrixLookupWeighted becomes invalid and the |
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76 | /// result of further use is undefined. |
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77 | /// |
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78 | MatrixLookupWeighted(const utility::matrix& matrix, |
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79 | const utility::matrix& weights, |
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80 | const bool owner=false); |
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81 | |
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82 | |
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83 | /// |
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84 | /// Constructor creating a lookup into the entire @a matrix. A |
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85 | /// weight matrix is constructed with weights 1 for values and 0 |
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86 | /// for nan's in @a matrix. |
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87 | /// |
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88 | /// \see bool utility::nan(const matrix&, matrix&); |
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89 | /// |
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90 | /// @note If @a matrix goes out of scope or |
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91 | /// is deleted, the MatrixLookupWeighted becomes invalid and the |
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92 | /// result of further use is undefined. |
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93 | /// |
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94 | MatrixLookupWeighted(const utility::matrix& matrix); |
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95 | |
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96 | |
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97 | /** |
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98 | Constructor creating a MatrixLookupWeighted from a MatrixLookup. A |
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99 | weight matrix with unitary weights are created internally. |
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100 | |
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101 | \note no check for nan is performed. |
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102 | |
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103 | \see bool utility::nan(const matrix&, matrix&); |
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104 | |
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105 | @note If @a matrix goes out of scope or |
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106 | is deleted, the MatrixLookupWeighted becomes invalid and the |
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107 | result of further use is undefined. |
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108 | */ |
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109 | MatrixLookupWeighted(const MatrixLookup& matrix); |
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110 | |
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111 | |
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112 | /// |
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113 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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114 | /// The @a row and @a column define what sub-matrix to look into, |
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115 | /// in other words, the created MatrixLookupWeighted will fullfill |
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116 | /// the following: |
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117 | /// MatrixLookupWeighted(i,j)=matrix(row[i],column[j]) |
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118 | /// weights(row[i],column[j]). This also means that number of |
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119 | /// rows in created MatrixLookupWeighted is equal to size of |
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120 | /// vector @a row, and number of columns is equal to size of |
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121 | /// vector @a column. |
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122 | /// |
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123 | /// @note If @a matrix or @a weights goes out of scope or is deleted, the |
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124 | /// MatrixLookupWeighted becomes invalid and the result of further use is |
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125 | /// undefined. |
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126 | /// |
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127 | MatrixLookupWeighted(const utility::matrix& matrix, |
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128 | const utility::matrix& weights, |
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129 | const std::vector<size_t>& row, |
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130 | const std::vector<size_t>& column); |
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131 | |
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132 | /// |
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133 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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134 | /// |
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135 | /// If @a row_vectors is true the new MatrixLookupWeighted will be |
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136 | /// consist of the row vectors defined by @a index. This means |
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137 | /// that the created MatrixLookupWeighted will fullfill: |
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138 | /// MatrixLookupWeighted(i,j)=matrix(i,index[j])*weights(i,index[j]) |
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139 | /// |
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140 | /// |
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141 | /// If @a row_vectors is false the new MatrixLookupWeighted will be consist |
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142 | /// of the rolumn vectors defined by @a index. This means that the |
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143 | /// created MatrixLookupWeighted will fullfill: |
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144 | /// |
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145 | /// |
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146 | /// @note If @a matrix or @a weights goes out of scope or is |
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147 | /// deleted, the MatrixLookupWeighted becomes invalid and the |
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148 | /// result of further use is undefined. |
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149 | /// |
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150 | MatrixLookupWeighted(const utility::matrix& matrix, |
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151 | const utility::matrix& weights, |
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152 | const std::vector<size_t>& index, |
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153 | const bool row_vectors); |
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154 | |
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155 | /// |
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156 | /// @brief Copy constructor. |
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157 | /// |
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158 | /// If \a other is owner of underlying data, constructed |
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159 | /// MatrixLookup will also be set as owner of underlying data. |
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160 | /// |
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161 | /// @note If underlying matrix goes out of scope or is deleted, the |
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162 | /// MatrixLookupWeighted becomes invalid and the result of further use is |
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163 | /// undefined. |
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164 | /// |
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165 | MatrixLookupWeighted(const MatrixLookupWeighted& other); |
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166 | |
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167 | /// |
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168 | /// Creates a sub-MatrixLookupWeighted. The Lookup is independent of |
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169 | /// MatrixLookupWeighted @a ml. The MatrixLookupWeighted is created to look |
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170 | /// directly into the underlying matrix to avoid multiple lookups. |
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171 | /// |
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172 | /// The @a row and @a column define what sub-matrix to look into, |
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173 | /// in other words, the created MatrixLookupWeighted will fullfill the |
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174 | /// following: \f$ MatrixLookupWeighted(i,j)=ml(row[i],column[j]) \f$. This |
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175 | /// also means that number of rows in created MatrixLookupWeighted is |
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176 | /// equal to size of vector @a row, and number of columns is equal |
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177 | /// to size of vector @a column. |
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178 | /// |
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179 | /// If \a ml is owner of underlying data, constructed |
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180 | /// MatrixLookup will also be set as owner of underlying data. |
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181 | /// |
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182 | /// @note If underlying matrix goes out of scope or is deleted, the |
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183 | /// MatrixLookupWeighted becomes invalid and the result of further use is |
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184 | /// undefined. |
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185 | /// |
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186 | MatrixLookupWeighted(const MatrixLookupWeighted& ml, |
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187 | const std::vector<size_t>& row, |
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188 | const std::vector<size_t>& column); |
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189 | |
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190 | /// |
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191 | /// Constructor creating a lookup into a sub-matrix of |
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192 | /// @a ml. The MatrixLookupWeighted is created to look directly into the |
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193 | /// underlying matrix to avoid multiple lookups. |
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194 | /// |
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195 | /// If @a row_vectors is true the new MatrixLookupWeighted will consist |
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196 | /// of the row vectors defined by @a index. This means that the |
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197 | /// created MatrixLookupWeighted will fullfill: |
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198 | /// \f$ MatrixLookupWeighted(i,j)=ml(i,index[j])\f$ |
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199 | /// |
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200 | /// If @a row_vectors is false the new MatrixLookupWeighted will consist |
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201 | /// of the rolumn vectors defined by @a index. This means that the |
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202 | /// created MatrixLookupWeighted will fullfill: |
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203 | /// \f$ MatrixLookupWeighted(i,j) = ml(index[i],j) \f$ |
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204 | /// |
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205 | /// If \a ml is owner of underlying data, constructed |
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206 | /// MatrixLookup will also be set as owner of underlying data. |
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207 | /// |
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208 | /// @note If underlying matrix goes out of scope or is deleted, the |
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209 | /// MatrixLookupWeighted becomes invalid and the result of further use is |
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210 | /// undefined. |
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211 | /// |
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212 | MatrixLookupWeighted(const MatrixLookupWeighted& ml, |
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213 | const std::vector<size_t>&, |
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214 | const bool row_vectors); |
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215 | |
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216 | /// |
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217 | /// Constructor creating a MatrixLookupWeighted with @a rows rows, @a |
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218 | /// columns columns, and all values are set to @a value. Created |
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219 | /// MatrixLookupWeighted owns its underlying matrix. |
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220 | /// |
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221 | MatrixLookupWeighted(const size_t rows, const size_t columns, |
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222 | const double value=0, const double weight=1); |
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223 | |
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224 | /// |
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225 | /// @brief The istream constructor. |
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226 | /// |
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227 | /// In construction the underlying matrix is created from |
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228 | /// stream. The MatrixLookupWeighted will be owner of the underlying |
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229 | /// matrix. |
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230 | /// |
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231 | /// @see matrix(istream&) for details. |
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232 | /// |
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233 | MatrixLookupWeighted(std::istream&, char sep='\0'); |
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234 | |
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235 | /// |
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236 | /// Destructor. If MatrixLookup is owner (and the only owner) of |
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237 | /// underlying matrix, the matrices are destroyed. |
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238 | /// |
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239 | virtual ~MatrixLookupWeighted(); |
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240 | |
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241 | /// |
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242 | /// @return data value of element (@a row, @a column) |
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243 | /// |
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244 | double data(size_t row, size_t column) const; |
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245 | |
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246 | /** |
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247 | the new MatrixLookup will consist of the rolumn vectors |
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248 | defined by @a index. This means that the returned |
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249 | MatrixLookupWeighted |
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250 | will fullfill: |
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251 | returned(i,j) = original(index[i],j) |
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252 | |
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253 | @note If underlying matrix goes out of scope or is deleted, the |
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254 | returned pointer becomes invalid and the result of further use is |
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255 | undefined. |
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256 | |
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257 | */ |
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258 | const MatrixLookupWeighted* selected(const std::vector<size_t>& i) const; |
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259 | |
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260 | /// |
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261 | /// The created MatrixLookupWeighted corresponds to all rows and the |
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262 | /// columns defined by @a index in the original MatrixLookupWeighted. The |
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263 | /// created MatrixLookupWeighted will fullfill: |
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264 | /// novel_ml(i,j)=original(i,index[j]). |
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265 | /// |
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266 | /// @return pointer to sub-Lookup of the MatrixLookupWeighted |
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267 | /// |
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268 | /// @note If underlying matrix goes out of scope or is deleted, the |
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269 | /// returned pointer becomes invalid and the result of further use is |
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270 | /// undefined. |
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271 | /// |
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272 | const MatrixLookupWeighted* |
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273 | training_data(const std::vector<size_t>& index) const; |
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274 | |
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275 | /// |
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276 | /// The created MatrixLookupWeighted corresponds to all rows and the |
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277 | /// columns defined by @a index in the original MatrixLookupWeighted. The |
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278 | /// created MatrixLookupWeighted will fullfill: |
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279 | /// novel_ml(i,j)=original(i,index[j]) |
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280 | /// |
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281 | /// @return pointer to sub-Lookup of the MatrixLookupWeighted |
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282 | /// |
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283 | /// @note If underlying matrix goes out of scope or is deleted, the |
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284 | /// returned pointer becomes invalid and the result of further use is |
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285 | /// undefined. |
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286 | /// |
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287 | const MatrixLookupWeighted* validation_data(const std::vector<size_t>&, |
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288 | const std::vector<size_t>&) const; |
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289 | |
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290 | /// |
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291 | /// @return weight value of element (@a row, @a column) |
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292 | /// |
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293 | double weight(size_t row, size_t column) const; |
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294 | |
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295 | /// |
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296 | /// @return true |
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297 | /// |
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298 | bool weighted(void) const; |
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299 | |
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300 | /// |
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301 | /// Access operator |
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302 | /// |
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303 | /// @return weight * data for element (@a row, @a column) |
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304 | /// |
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305 | double operator()(const size_t row, const size_t column) const; |
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306 | |
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307 | /// |
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308 | /// @brief assigment operator |
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309 | /// |
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310 | /// Does only change MatrixLookupWeighted not the underlying |
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311 | /// matrix object. However if the MatrixLookupWeighted is owner |
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312 | /// (and the only owner) of its underlying data, those data will |
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313 | /// be deleted here. |
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314 | /// |
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315 | const MatrixLookupWeighted& operator=(const MatrixLookupWeighted&); |
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316 | |
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317 | private: |
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318 | const utility::matrix* data_; |
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319 | const utility::matrix* weights_; |
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320 | u_int* ref_count_weights_; |
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321 | }; |
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322 | |
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323 | /// |
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324 | /// The output operator MatrixLookupWeighted |
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325 | /// |
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326 | /// For eacd data element data(i,j) is printed except those being |
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327 | /// associated with a zero weight for which nothing is printed. |
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328 | /// |
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329 | std::ostream& operator<< (std::ostream& s, const MatrixLookupWeighted&); |
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330 | |
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331 | }}} // of namespace classifier, yat, and theplu |
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332 | |
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333 | #endif |
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