1 | #ifndef _theplu_yat_classifier_matrix_lookup_ |
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2 | #define _theplu_yat_classifier_matrix_lookup_ |
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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) 2005 Peter Johansson, Markus Ringnér |
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8 | Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér |
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9 | Copyright (C) 2007 Jari Häkkinen, Peter Johansson |
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10 | Copyright (C) 2008 Peter Johansson |
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11 | |
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12 | This file is part of the yat library, http://dev.thep.lu.se/yat |
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13 | |
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14 | The yat library is free software; you can redistribute it and/or |
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15 | modify it under the terms of the GNU General Public License as |
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16 | published by the Free Software Foundation; either version 3 of the |
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17 | License, or (at your option) any later version. |
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18 | |
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19 | The yat library is distributed in the hope that it will be useful, |
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20 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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22 | General Public License for more details. |
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23 | |
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24 | You should have received a copy of the GNU General Public License |
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25 | along with yat. If not, see <http://www.gnu.org/licenses/>. |
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26 | */ |
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27 | |
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28 | #include "yat/utility/Container2DIterator.h" |
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29 | #include "yat/utility/Index.h" |
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30 | #include "yat/utility/iterator_traits.h" |
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31 | #include "yat/utility/Matrix.h" |
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32 | #include "yat/utility/SmartPtr.h" |
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33 | |
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34 | #include <boost/iterator/permutation_iterator.hpp> |
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35 | |
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36 | #include <iostream> |
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37 | #include <vector> |
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38 | |
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39 | namespace theplu { |
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40 | namespace yat { |
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41 | namespace classifier { |
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42 | |
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43 | /// |
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44 | /// @brief General view into utility::Matrix |
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45 | /// |
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46 | /// MatrixLookups can be used to create lookups/views into matrices |
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47 | /// in a more general way than the views supported in the matrix |
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48 | /// class. The object does not contain any data, but only a pointer |
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49 | /// to a utility::Matrix and row and columns incices defining which |
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50 | /// sub-matrix to look into. Each row and each column corresponds |
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51 | /// to a row and a column in the utility::Matrix, respectively. This design |
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52 | /// allow for fast creation of sub-matrices, which is a common |
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53 | /// operation in most traning/validation procedures. The views are |
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54 | /// const views in the sense that they cannot modify underlying |
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55 | /// utility::Matrix. |
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56 | /// |
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57 | /// A MatrixLookup can be created directly from a utility::Matrix or from |
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58 | /// another MatrixLookup. In the latter case, the resulting |
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59 | /// MatrixLookup is looking directly into the underlying utility::Matrix to |
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60 | /// avoid multiple lookups. |
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61 | /// |
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62 | /// There is a possibility to set the MatrixLookup as owner of the |
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63 | /// underlying utility::Matrix. This implies that underlying data is deleted |
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64 | /// in destructor of MatrixLookup, but only if there is no other |
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65 | /// owner of the underlying data. A reference counter is used to |
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66 | /// keep track of number of owners. Ownership is copied in copy |
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67 | /// constructors and assignments. |
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68 | /// |
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69 | /// \see MatrixLookupWeighted |
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70 | /// |
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71 | class MatrixLookup |
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72 | { |
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73 | public: |
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74 | /** |
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75 | value_type is double |
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76 | |
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77 | \since New in yat 0.5 |
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78 | */ |
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79 | typedef utility::Matrix::value_type value_type; |
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80 | |
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81 | /** |
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82 | const_reference type is const double& |
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83 | |
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84 | \since New in yat 0.5 |
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85 | */ |
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86 | typedef utility::Matrix::const_reference const_reference; |
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87 | |
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88 | /// 'Read Only' iterator |
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89 | typedef utility::Container2DIterator<const MatrixLookup, value_type, |
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90 | const_reference> |
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91 | const_iterator; |
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92 | |
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93 | /** |
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94 | 'Read only' iterator used to iterate over a column |
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95 | */ |
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96 | typedef boost::permutation_iterator<utility::Matrix::const_column_iterator, |
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97 | utility::Index::const_iterator> |
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98 | const_column_iterator; |
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99 | |
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100 | /** |
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101 | 'Read only' iterator used to iterate over a row |
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102 | */ |
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103 | typedef const_column_iterator const_row_iterator; |
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104 | |
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105 | /// |
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106 | /// Constructor creating a lookup into the entire @a matrix. |
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107 | /// \param matrix underlying matrix |
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108 | /// @param own if true MatrixLookup owns its underlying @a matrix |
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109 | /// |
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110 | /// @note If \a own is true and \a matrix is already owned by some |
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111 | /// other object, this will lead to \a matrix having multiple |
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112 | /// owners without the owners being aware of each |
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113 | /// other. Consequently multiple deletion will occur. |
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114 | /// |
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115 | /// @note If @a matrix goes out of scope or is deleted, the |
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116 | /// MatrixLookup becomes invalid and the result of further use is |
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117 | /// undefined. |
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118 | /// |
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119 | MatrixLookup(const utility::Matrix& matrix, const bool own=false); |
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120 | |
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121 | /// |
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122 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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123 | /// The @a row and @a column define what sub-matrix to look into, |
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124 | /// in other words, the created MatrixLookup will fullfill the |
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125 | /// following: \f$ MatrixLookup(i,j)=matrix(row[i],column[j]) |
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126 | /// \f$. This also means that number of rows in created |
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127 | /// MatrixLookup is equal to size of vector @a row, and number of |
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128 | /// columns is equal to size of vector @a column. |
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129 | /// |
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130 | /// @note If @a matrix goes out of scope or is deleted, the |
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131 | /// MatrixLookup becomes invalid and the result of further use is |
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132 | /// undefined. |
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133 | /// |
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134 | MatrixLookup(const utility::Matrix& matrix, const utility::Index& row, |
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135 | const utility::Index& column); |
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136 | |
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137 | /// |
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138 | /// Constructor creating a lookup into a sub-matrix of @a matrix. |
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139 | /// |
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140 | /// If @a row_vectors is true the new MatrixLookup will consist |
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141 | /// of the row vectors defined by @a index. This means that the |
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142 | /// created MatrixLookup will fullfill: |
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143 | /// \f$ MatrixLookup(i,j)=matrix(i,index[j]) \f$ |
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144 | /// |
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145 | /// If @a row_vectors is false the new MatrixLookup will be consist |
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146 | /// of the rolumn vectors defined by @a index. This means that the |
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147 | /// created MatrixLookup will fullfill: |
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148 | /// \f$ MatrixLookup(i,j)=matrix(index[i],j) \f$ |
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149 | /// |
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150 | /// @note If @a matrix goes out of scope or is deleted, the |
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151 | /// MatrixLookup becomes invalid and the result of further use is |
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152 | /// undefined. |
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153 | /// |
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154 | MatrixLookup(const utility::Matrix& matrix, |
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155 | const utility::Index& index, |
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156 | const bool row_vectors); |
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157 | |
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158 | /// |
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159 | /// @brief Copy constructor. |
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160 | /// |
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161 | /// If \a other is owner of underlying data, constructed |
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162 | /// MatrixLookup will also be set as owner of underlying data. |
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163 | /// |
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164 | /// @note If underlying matrix goes out of scope or is deleted, the |
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165 | /// MatrixLookup becomes invalid and the result of further use is |
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166 | /// undefined. |
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167 | /// |
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168 | MatrixLookup(const MatrixLookup& other); |
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169 | |
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170 | /// |
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171 | /// @brief Create a sub-MatrixLookup. |
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172 | /// |
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173 | /// The Lookup is independent of |
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174 | /// MatrixLookup @a ml. The MatrixLookup is created to look |
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175 | /// directly into the underlying matrix to avoid multiple lookups. |
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176 | /// |
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177 | /// If \a ml is owner of underlying data, constructed |
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178 | /// MatrixLookup will also be set as owner of underlying data. |
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179 | /// |
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180 | /// The @a row and @a column define what sub-matrix to look into, |
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181 | /// in other words, the created MatrixLookup will fullfill the |
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182 | /// following: MatrixLookup(i,j)=ml(row[i],column[j]). This |
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183 | /// also means that number of rows in created MatrixLookup is |
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184 | /// equal to size of vector @a row, and number of columns is equal |
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185 | /// to size of vector @a column. |
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186 | /// |
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187 | /// If \a ml is owner of underlying data, constructed |
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188 | /// MatrixLookup will also be set as owner of underlying data. |
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189 | /// |
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190 | /// @note If underlying matrix goes out of scope or is deleted, the |
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191 | /// MatrixLookup becomes invalid and the result of further use is |
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192 | /// undefined. |
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193 | /// |
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194 | MatrixLookup(const MatrixLookup& ml, const utility::Index& row, |
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195 | const utility::Index& column); |
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196 | |
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197 | /// |
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198 | /// Constructor creating a lookup into a sub-matrix of |
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199 | /// @a ml. The MatrixLookup is created to look directly into the |
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200 | /// underlying matrix to avoid multiple lookups. |
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201 | /// |
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202 | /// If @a row_vectors is true the new MatrixLookup will consist |
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203 | /// of the row vectors defined by @a index. This means that the |
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204 | /// created MatrixLookup will fullfill: |
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205 | /// MatrixLookup(i,j)=ml(i,index[j]) |
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206 | /// |
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207 | /// If @a row_vectors is false the new MatrixLookup will consist |
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208 | /// of the rolumn vectors defined by @a index. This means that the |
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209 | /// created MatrixLookup will fullfill: |
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210 | /// \f$ MatrixLookup(i,j) = ml(index[i],j) \f$ |
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211 | /// |
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212 | /// If \a ml is owner of underlying data, constructed |
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213 | /// MatrixLookup will also be set as owner of underlying data. |
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214 | /// |
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215 | /// @note If underlying matrix goes out of scope or is deleted, the |
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216 | /// MatrixLookup becomes invalid and the result of further use is |
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217 | /// undefined. |
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218 | /// |
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219 | MatrixLookup(const MatrixLookup& ml, const utility::Index&, |
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220 | const bool row_vectors); |
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221 | |
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222 | /// |
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223 | /// Constructor creating a MatrixLookup with @a rows rows, @a |
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224 | /// columns columns, and all values are set to @a value. Created |
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225 | /// MatrixLookup owns its underlying matrix. |
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226 | /// |
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227 | MatrixLookup(const size_t rows, const size_t columns, const double value=0); |
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228 | |
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229 | /// |
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230 | /// @brief The istream constructor. |
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231 | /// |
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232 | /// In construction the underlying matrix is created from |
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233 | /// stream. The MatrixLookup will be owner of the underlying |
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234 | /// matrix. |
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235 | /// |
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236 | /// @see matrix(istream&) for details. |
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237 | /// |
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238 | MatrixLookup(std::istream&, char sep='\0'); |
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239 | |
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240 | /// |
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241 | /// @brief Destructor. |
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242 | /// |
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243 | /// If ownership is set true and there is no other owner of |
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244 | /// underlying data, underlying data is deleted. |
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245 | /// |
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246 | virtual ~MatrixLookup(); |
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247 | |
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248 | /** |
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249 | Iterator iterates along a row. When end of row is reached it |
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250 | jumps to beginning of next row. |
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251 | |
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252 | \return const_iterator pointing to upper-left element. |
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253 | */ |
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254 | const_iterator begin(void) const; |
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255 | |
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256 | /** |
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257 | Iterator iterates along a column. |
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258 | |
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259 | \return iterator pointing to first element of column \a i. |
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260 | */ |
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261 | const_column_iterator begin_column(size_t) const; |
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262 | |
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263 | /** |
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264 | Iterator iterates along a column. |
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265 | |
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266 | \return const_iterator pointing to first element of column \a i. |
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267 | */ |
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268 | const_row_iterator begin_row(size_t) const; |
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269 | |
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270 | /** |
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271 | \return number of columns |
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272 | */ |
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273 | size_t columns(void) const; |
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274 | |
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275 | /** |
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276 | \return const_iterator pointing to end of matrix |
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277 | */ |
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278 | const_iterator end(void) const; |
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279 | |
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280 | /** |
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281 | \return const_iterator pointing to end of column \a i |
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282 | */ |
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283 | const_column_iterator end_column(size_t) const; |
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284 | |
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285 | /** |
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286 | \return const_iterator pointing to end of row \a i |
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287 | */ |
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288 | const_row_iterator end_row(size_t) const; |
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289 | |
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290 | /** |
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291 | \return number of rows |
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292 | */ |
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293 | size_t rows(void) const; |
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294 | |
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295 | /// |
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296 | /// @return false |
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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 element |
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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 MatrixLookup not the underlying matrix |
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311 | /// object. However if the MatrixLookup is owner (and the only owner) |
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312 | /// of its underlying |
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313 | /// matrix, that matrix will be deleted here. |
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314 | /// |
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315 | const MatrixLookup& operator=(const MatrixLookup&); |
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316 | |
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317 | private: |
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318 | friend class MatrixLookupWeighted; |
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319 | |
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320 | utility::Index column_index_; |
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321 | typedef utility::SmartPtr<const utility::Matrix> MatrixP; |
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322 | MatrixP data_; |
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323 | utility::Index row_index_; |
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324 | |
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325 | // for assertions |
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326 | bool validate(void) const; |
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327 | }; |
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328 | |
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329 | /// |
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330 | /// The output operator MatrixLookup |
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331 | /// |
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332 | std::ostream& operator<< (std::ostream& s, const MatrixLookup&); |
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333 | |
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334 | }}} // of namespace classifier, yat, and theplu |
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335 | |
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336 | #endif |
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