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<a href="pca_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#ifndef MLPACK_METHODS_PCA_PCA_HPP</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#define MLPACK_METHODS_PCA_PCA_HPP</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <<a class="code" href="prereqs_8hpp.html">mlpack/prereqs.hpp</a>></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <<a class="code" href="exact__svd__method_8hpp.html">mlpack/methods/pca/decomposition_policies/exact_svd_method.hpp</a>></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span><a class="code" href="namespacemlpack.html">mlpack</a> {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">namespace </span>pca {</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">template</span><<span class="keyword">typename</span> DecompositionPolicy = ExactSVDPolicy></div><div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html"> 34</a></span> <span class="keyword">class </span><a class="code" href="classmlpack_1_1pca_1_1PCAType.html">PCAType</a></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a551aaab2f584fe12a634fdba30519597">PCAType</a>(<span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">scaleData</a> = <span class="keyword">false</span>,</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">const</span> DecompositionPolicy& <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a212af59371bb9d91ebd8904380eb669e">decomposition</a> = DecompositionPolicy());</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">void</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">Apply</a>(<span class="keyword">const</span> arma::mat& data,</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  arma::mat& transformedData,</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  arma::vec& eigVal,</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  arma::mat& eigvec);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">void</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">Apply</a>(<span class="keyword">const</span> arma::mat& data,</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  arma::mat& transformedData,</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  arma::vec& eigVal);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">double</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">Apply</a>(arma::mat& data, <span class="keyword">const</span> <span class="keywordtype">size_t</span> newDimension);</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#abe696c358654af77a7b9bf7fd677c3c4"> 86</a></span>  <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#abe696c358654af77a7b9bf7fd677c3c4">Apply</a>(arma::mat& data, <span class="keyword">const</span> <span class="keywordtype">int</span> newDimension)</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">Apply</a>(data, <span class="keywordtype">size_t</span>(newDimension));</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">double</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">Apply</a>(arma::mat& data, <span class="keyword">const</span> <span class="keywordtype">double</span> varRetained);</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00110"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#abf8f9a3aea395344387cdf6fdad0dc6f"> 110</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#abf8f9a3aea395344387cdf6fdad0dc6f">ScaleData</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">scaleData</a>; }</div><div class="line"><a name="l00113"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#af7e552471e2f8ccbfba73e5c9ed2aca7"> 113</a></span>  <span class="keywordtype">bool</span>& <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#af7e552471e2f8ccbfba73e5c9ed2aca7">ScaleData</a>() { <span class="keywordflow">return</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">scaleData</a>; }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#ab4c153104d8dec8cc848aa708200b352"> 117</a></span>  <span class="keywordtype">void</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#ab4c153104d8dec8cc848aa708200b352">ScaleData</a>(arma::mat& centeredData)</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span> (<a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">scaleData</a>)</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Scaling the data is when we reduce the variance of each dimension</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// to 1. We do this by dividing each dimension by its standard</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// deviation.</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  arma::vec stdDev = arma::stddev(</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  centeredData, 0, 1 <span class="comment">/* for each dimension */</span>);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// If there are any zeroes, make them very small.</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < stdDev.n_elem; ++i)</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (stdDev[i] == 0)</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  stdDev[i] = 1e-50;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  centeredData /= arma::repmat(stdDev, 1, centeredData.n_cols);</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div><div class="line"><a name="l00138"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec"> 138</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">scaleData</a>;</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="classmlpack_1_1pca_1_1PCAType.html#a212af59371bb9d91ebd8904380eb669e"> 141</a></span>  DecompositionPolicy <a class="code" href="classmlpack_1_1pca_1_1PCAType.html#a212af59371bb9d91ebd8904380eb669e">decomposition</a>;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> }; <span class="comment">// class PCA</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00145"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1pca.html#a89b48ac6fa2787f4d1f69c20ce3d5c20"> 145</a></span> <span class="keyword">typedef</span> <a class="code" href="classmlpack_1_1pca_1_1PCAType.html">PCAType<ExactSVDPolicy></a> <a class="code" href="namespacemlpack_1_1pca.html#a89b48ac6fa2787f4d1f69c20ce3d5c20">PCA</a>;</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> } <span class="comment">// namespace pca</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> } <span class="comment">// namespace mlpack</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment">// Include implementation.</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="preprocessor">#include "pca_impl.hpp"</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_af7e552471e2f8ccbfba73e5c9ed2aca7"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#af7e552471e2f8ccbfba73e5c9ed2aca7">mlpack::pca::PCAType::ScaleData</a></div><div class="ttdeci">bool & ScaleData()</div><div class="ttdoc">Modify whether or not this PCA object will scale (by standard deviation) the data when PCA is perform...</div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00113">pca.hpp:113</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_abe696c358654af77a7b9bf7fd677c3c4"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#abe696c358654af77a7b9bf7fd677c3c4">mlpack::pca::PCAType::Apply</a></div><div class="ttdeci">double Apply(arma::mat &data, const int newDimension)</div><div class="ttdoc">This overload is here to make sure int gets casted right to size_t. </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00086">pca.hpp:86</a></div></div>
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<div class="ttc" id="namespacemlpack_html"><div class="ttname"><a href="namespacemlpack.html">mlpack</a></div><div class="ttdoc">Linear algebra utility functions, generally performed on matrices or vectors. </div><div class="ttdef"><b>Definition:</b> <a href="binarize_8hpp_source.html#l00018">binarize.hpp:18</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html">mlpack::pca::PCAType</a></div><div class="ttdoc">This class implements principal components analysis (PCA). </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00034">pca.hpp:34</a></div></div>
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<div class="ttc" id="prereqs_8hpp_html"><div class="ttname"><a href="prereqs_8hpp.html">prereqs.hpp</a></div><div class="ttdoc">The core includes that mlpack expects; standard C++ includes and Armadillo. </div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_a7891d65ea41977d422277644379e9f4e"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#a7891d65ea41977d422277644379e9f4e">mlpack::pca::PCAType::Apply</a></div><div class="ttdeci">void Apply(const arma::mat &data, arma::mat &transformedData, arma::vec &eigVal, arma::mat &eigvec)</div><div class="ttdoc">Apply Principal Component Analysis to the provided data set. </div></div>
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<div class="ttc" id="namespacemlpack_1_1pca_html_a89b48ac6fa2787f4d1f69c20ce3d5c20"><div class="ttname"><a href="namespacemlpack_1_1pca.html#a89b48ac6fa2787f4d1f69c20ce3d5c20">mlpack::pca::PCA</a></div><div class="ttdeci">PCAType< ExactSVDPolicy > PCA</div><div class="ttdoc">3.0.0 TODO: break reverse-compatibility by changing PCAType to PCA. </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00145">pca.hpp:145</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_a212af59371bb9d91ebd8904380eb669e"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#a212af59371bb9d91ebd8904380eb669e">mlpack::pca::PCAType::decomposition</a></div><div class="ttdeci">DecompositionPolicy decomposition</div><div class="ttdoc">Decomposition method used to perform principal components analysis. </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00141">pca.hpp:141</a></div></div>
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<div class="ttc" id="exact__svd__method_8hpp_html"><div class="ttname"><a href="exact__svd__method_8hpp.html">exact_svd_method.hpp</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_ab4c153104d8dec8cc848aa708200b352"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#ab4c153104d8dec8cc848aa708200b352">mlpack::pca::PCAType::ScaleData</a></div><div class="ttdeci">void ScaleData(arma::mat &centeredData)</div><div class="ttdoc">Scaling the data is when we reduce the variance of each dimension to 1. </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00117">pca.hpp:117</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_abf8f9a3aea395344387cdf6fdad0dc6f"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#abf8f9a3aea395344387cdf6fdad0dc6f">mlpack::pca::PCAType::ScaleData</a></div><div class="ttdeci">bool ScaleData() const </div><div class="ttdoc">Get whether or not this PCA object will scale (by standard deviation) the data when PCA is performed...</div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00110">pca.hpp:110</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_a0619edd97ebbede0256519368a1decec"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#a0619edd97ebbede0256519368a1decec">mlpack::pca::PCAType::scaleData</a></div><div class="ttdeci">bool scaleData</div><div class="ttdoc">Whether or not the data will be scaled by standard deviation when PCA is performed. </div><div class="ttdef"><b>Definition:</b> <a href="pca_8hpp_source.html#l00138">pca.hpp:138</a></div></div>
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<div class="ttc" id="classmlpack_1_1pca_1_1PCAType_html_a551aaab2f584fe12a634fdba30519597"><div class="ttname"><a href="classmlpack_1_1pca_1_1PCAType.html#a551aaab2f584fe12a634fdba30519597">mlpack::pca::PCAType::PCAType</a></div><div class="ttdeci">PCAType(const bool scaleData=false, const DecompositionPolicy &decomposition=DecompositionPolicy())</div><div class="ttdoc">Create the PCA object, specifying if the data should be scaled in each dimension by standard deviatio...</div></div>
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