1 | #ifndef _theplu_classifier_matrix_lookup_ |
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2 | #define _theplu_classifier_matrix_lookup_ |
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3 | |
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4 | // $Id$ |
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5 | |
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6 | #include <c++_tools/classifier/DataLookup2D.h> |
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7 | #include <c++_tools/utility/matrix.h> |
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8 | |
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9 | #include <cassert> |
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10 | |
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11 | namespace theplu { |
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12 | namespace classifier { |
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13 | |
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14 | |
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15 | |
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16 | /// |
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17 | /// MatrixLookups can be used to create lookups/views into matrices |
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18 | /// in a more general way than the views supported in the matrix |
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19 | /// class. The object does not contain any data, but only a pointer |
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20 | /// to a matrix and row and columns incices defining which |
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21 | /// sub-matrix to look into. Each row and each column corresponds |
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22 | /// to a row and a column in the Kernel, respectively. This design |
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23 | /// allow for fast creation of sub-matrices, which is a common |
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24 | /// operation in most traning/validation procedures. |
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25 | /// |
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26 | /// A MatrixLookup can be created directly from a matrix or from an |
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27 | /// other MatrixLookup. In the latter case, the resulting |
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28 | /// MatrixLookup is looking directly into the underlying matrix to |
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29 | /// avoid multiple lookups. |
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30 | /// |
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31 | /// There is a possibility to set the MatrixLookup as owner of the |
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32 | /// underlying matrix. In that case the underlying matrix will be |
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33 | /// destroyed in the destructor. Consequently, the underlying matrix |
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34 | /// must have been dynamically allocated and no other MatrixLookup |
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35 | /// can own the Kernel. |
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36 | /// |
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37 | class MatrixLookup : public DataLookup2D |
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38 | { |
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39 | |
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40 | public: |
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41 | |
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42 | |
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43 | /// |
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44 | /// Constructor creating a lookup into the entire @a matrix. |
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45 | /// |
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46 | /// @note If @a matrix goes out of scope or is deleted, the |
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47 | /// MatrixLookup becomes invalid and the result of further use is |
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48 | /// undefined. |
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49 | /// |
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50 | explicit MatrixLookup(const utility::matrix& matrix); |
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51 | |
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52 | /// |
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53 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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54 | /// The @a row and @a column define what sub-matrix to look into, |
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55 | /// in other words, the created MatrixLookup will fullfill the |
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56 | /// following: \f$ MatrixLookup(i,j)=matrix(row[i],column[j]) |
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57 | /// \f$. This also means that number of rows in created |
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58 | /// MatrixLookup is equal to size of vector @a row, and number of |
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59 | /// columns is equal to size of vector @a column. |
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60 | /// |
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61 | /// @note If @a matrix goes out of scope or is deleted, the |
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62 | /// MatrixLookup becomes invalid and the result of further use is |
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63 | /// undefined. |
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64 | /// |
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65 | MatrixLookup(const utility::matrix& matrix, const std::vector<size_t>& row, |
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66 | const std::vector<size_t>& column); |
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67 | |
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68 | /// |
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69 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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70 | /// |
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71 | /// If @a row_vectors is true the new MatrixLookup will consist |
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72 | /// of the row vectors defined by @a index. This means that the |
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73 | /// created MatrixLookup will fullfill: |
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74 | /// \f$ MatrixLookup(i,j)=matrix(i,index[j]) \f$ |
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75 | /// |
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76 | /// If @a row_vectors is false the new MatrixLookup will be consist |
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77 | /// of the rolumn vectors defined by @a index. This means that the |
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78 | /// created MatrixLookup will fullfill: |
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79 | /// \f$ MatrixLookup(i,j)=matrix(index[i],j) \f$ |
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80 | /// |
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81 | /// @note If @a matrix goes out of scope or is deleted, the |
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82 | /// MatrixLookup becomes invalid and the result of further use is |
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83 | /// undefined. |
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84 | /// |
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85 | MatrixLookup(const utility::matrix& matrix, |
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86 | const std::vector<size_t>& index, |
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87 | const bool row_vectors); |
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88 | |
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89 | /// |
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90 | /// @brief Copy constructor. |
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91 | /// |
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92 | /// @note If underlying matrix goes out of scope or is deleted, the |
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93 | /// MatrixLookup becomes invalid and the result of further use is |
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94 | /// undefined. |
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95 | /// |
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96 | MatrixLookup(const MatrixLookup&); |
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97 | |
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98 | /// |
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99 | /// Creates a sub-MatrixLookup. The Lookup is independent of |
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100 | /// MatrixLookup @a ml. The MatrixLookup is created to look |
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101 | /// directly into the underlying matrix to avoid multiple lookups. |
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102 | /// |
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103 | /// The @a row and @a column define what sub-matrix to look into, |
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104 | /// in other words, the created MatrixLookup will fullfill the |
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105 | /// following: \f$ MatrixLookup(i,j)=ml(row[i],column[j]) \f$. This |
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106 | /// also means that number of rows in created MatrixLookup is |
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107 | /// equal to size of vector @a row, and number of columns is equal |
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108 | /// to size of vector @a column. |
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109 | /// |
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110 | /// @note If underlying matrix goes out of scope or is deleted, the |
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111 | /// MatrixLookup becomes invalid and the result of further use is |
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112 | /// undefined. |
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113 | /// |
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114 | MatrixLookup(const MatrixLookup& ml, const std::vector<size_t>& row, |
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115 | const std::vector<size_t>& column); |
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116 | |
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117 | /// |
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118 | /// Constructor creating a lookup into a sub-matrix of |
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119 | /// @a ml. The MatrixLookup is created to look directly into the |
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120 | /// underlying matrix to avoid multiple lookups. |
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121 | /// |
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122 | /// If @a row_vectors is true the new MatrixLookup will consist |
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123 | /// of the row vectors defined by @a index. This means that the |
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124 | /// created MatrixLookup will fullfill: |
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125 | /// \f$ MatrixLookup(i,j)=ml(i,index[j])\f$ |
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126 | /// |
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127 | /// If @a row_vectors is false the new MatrixLookup will consist |
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128 | /// of the rolumn vectors defined by @a index. This means that the |
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129 | /// created MatrixLookup will fullfill: |
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130 | /// \f$ MatrixLookup(i,j) = ml(index[i],j) \f$ |
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131 | /// |
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132 | /// @note If underlying matrix goes out of scope or is deleted, the |
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133 | /// MatrixLookup becomes invalid and the result of further use is |
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134 | /// undefined. |
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135 | /// |
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136 | MatrixLookup(const MatrixLookup& ml, const std::vector<size_t>&, |
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137 | const bool row_vectors); |
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138 | |
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139 | /// |
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140 | /// Constructor creating a MatrixLookup with @a rows rows, @a |
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141 | /// columns columns, and all values are set to @a value. Created |
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142 | /// MatrixLookup owns its underlying matrix. |
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143 | /// |
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144 | MatrixLookup(const size_t rows, const size_t columns, const double value=0); |
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145 | |
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146 | /// |
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147 | /// @brief The istream constructor. |
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148 | /// |
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149 | /// In construction the underlying matrix is created from |
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150 | /// stream. The MatrixLookup will be owner of the underlying |
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151 | /// matrix. |
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152 | /// |
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153 | /// @see matrix(istream&) for details. |
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154 | /// |
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155 | MatrixLookup(std::istream&, char sep='\0'); |
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156 | |
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157 | /// |
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158 | /// Destructor. |
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159 | /// |
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160 | virtual ~MatrixLookup(); |
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161 | |
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162 | /** |
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163 | the new MatrixLookup will consist of the rolumn vectors |
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164 | defined by @a index. This means that the returned MatrixLookup |
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165 | will fullfill: \f$ returned(i,j) = original(index[i],j) \f$ |
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166 | |
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167 | @note If underlying matrix goes out of scope or is deleted, the |
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168 | returned pointer becomes invalid and the result of further use is |
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169 | undefined. |
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170 | |
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171 | */ |
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172 | const MatrixLookup* selected(const std::vector<size_t>&) const; |
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173 | |
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174 | /// |
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175 | /// The created MatrixLookup corresponds to all rows and the |
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176 | /// columns defined by @a index in the original MatrixLookup. The |
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177 | /// created MatrixLookup will fullfill: |
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178 | /// \f$ novel_ml(i,j)=original(i,index[j]) \f$. |
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179 | /// |
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180 | /// @return pointer to sub-Lookup of the MatrixLookup |
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181 | /// |
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182 | /// @note If underlying matrix goes out of scope or is deleted, the |
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183 | /// returned pointer becomes invalid and the result of further use is |
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184 | /// undefined. |
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185 | /// |
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186 | /// @Note Returns a dynamically allocated DataLookup2D, which has |
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187 | /// to be deleted by the caller to avoid memory leaks. |
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188 | /// |
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189 | const MatrixLookup* training_data(const std::vector<size_t>& index) const; |
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190 | |
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191 | /// |
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192 | /// The created MatrixLookup corresponds to all rows and the |
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193 | /// columns defined by @a index in the original MatrixLookup. The |
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194 | /// created MatrixLookup will fullfill: |
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195 | /// \f$ novel_ml(i,j)=original(i,index[j]) \f$. |
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196 | /// |
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197 | /// @return pointer to sub-Lookup of the MatrixLookup |
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198 | /// |
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199 | /// @note If underlying matrix goes out of scope or is deleted, the |
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200 | /// returned pointer becomes invalid and the result of further use is |
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201 | /// undefined. |
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202 | /// |
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203 | const MatrixLookup* validation_data(const std::vector<size_t>&, |
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204 | const std::vector<size_t>&) const; |
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205 | /// |
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206 | /// @return false |
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207 | /// |
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208 | bool weighted(void) const; |
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209 | |
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210 | /// |
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211 | /// Access operator |
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212 | /// |
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213 | /// @return element |
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214 | /// |
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215 | inline double operator()(const size_t row, const size_t column) const |
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216 | { |
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217 | assert(row<rows()); |
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218 | assert(column<columns()); |
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219 | return (*data_)(row_index_[row], column_index_[column]); |
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220 | } |
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221 | |
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222 | /// |
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223 | /// @brief assigment operator |
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224 | /// |
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225 | /// Does only change MatrixLookup not the underlying matrix |
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226 | /// object. However if the MatrixLookup is owner of its underlying |
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227 | /// matrix, that matrix will be deleted here. |
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228 | /// |
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229 | const MatrixLookup& operator=(const MatrixLookup&); |
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230 | |
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231 | private: |
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232 | const utility::matrix* data_; |
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233 | }; |
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234 | |
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235 | /// |
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236 | /// The output operator MatrixLookup |
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237 | /// |
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238 | std::ostream& operator<< (std::ostream& s, const MatrixLookup&); |
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239 | |
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240 | }} // of namespace classifier and namespace theplu |
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241 | |
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242 | #endif |
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