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<div class="title">random.hpp</div> </div>
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<a href="random_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="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#ifndef MLPACK_CORE_MATH_RANDOM_HPP</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#define MLPACK_CORE_MATH_RANDOM_HPP</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <<a class="code" href="prereqs_8hpp.html">mlpack/prereqs.hpp</a>></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <mlpack/mlpack_export.hpp></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <random></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span><a class="code" href="namespacemlpack.html">mlpack</a> {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>math {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// Global random object.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">extern</span> MLPACK_EXPORT std::mt19937 <a class="code" href="namespacemlpack_1_1math.html#a6bcdf252b96b6e681108f1ec9e81ae06">randGen</a>;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// Global uniform distribution.</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">extern</span> MLPACK_EXPORT std::uniform_real_distribution<> <a class="code" href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">randUniformDist</a>;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// Global normal distribution.</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">extern</span> MLPACK_EXPORT std::normal_distribution<> <a class="code" href="namespacemlpack_1_1math.html#a8f912bbb6f93ae030cee1a0a2c95322a">randNormalDist</a>;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a99560c3cf9c2db393309a31933b8d480"> 40</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespacemlpack_1_1math.html#a99560c3cf9c2db393309a31933b8d480">RandomSeed</a>(<span class="keyword">const</span> <span class="keywordtype">size_t</span> seed)</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  randGen.seed((uint32_t) seed);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  srand((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>) seed);</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#if ARMA_VERSION_MAJOR > 3 || \</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor"> (ARMA_VERSION_MAJOR == 3 && ARMA_VERSION_MINOR >= 930)</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// Armadillo >= 3.930 has its own random number generator internally that we</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// need to set the seed for also.</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  arma::arma_rng::set_seed(seed);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a305db122ade561ba1fe874bd51e9797d"> 55</a></span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="namespacemlpack_1_1math.html#a305db122ade561ba1fe874bd51e9797d">Random</a>()</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> {</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> <a class="code" href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">randUniformDist</a>(randGen);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a73063c4b5f50db033266cd16afaceca9"> 63</a></span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="namespacemlpack_1_1math.html#a305db122ade561ba1fe874bd51e9797d">Random</a>(<span class="keyword">const</span> <span class="keywordtype">double</span> lo, <span class="keyword">const</span> <span class="keywordtype">double</span> hi)</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span> lo + (hi - lo) * <a class="code" href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">randUniformDist</a>(randGen);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> }</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#aad090ac225728d74c1b66bcf52f3ab95"> 71</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="namespacemlpack_1_1math.html#aad090ac225728d74c1b66bcf52f3ab95">RandInt</a>(<span class="keyword">const</span> <span class="keywordtype">int</span> hiExclusive)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">return</span> (<span class="keywordtype">int</span>) std::floor((<span class="keywordtype">double</span>) hiExclusive * <a class="code" href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">randUniformDist</a>(randGen));</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> }</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div><div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a2befbd48db5691a0ed3b87bb4b423095"> 79</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="namespacemlpack_1_1math.html#aad090ac225728d74c1b66bcf52f3ab95">RandInt</a>(<span class="keyword">const</span> <span class="keywordtype">int</span> lo, <span class="keyword">const</span> <span class="keywordtype">int</span> hiExclusive)</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> {</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> lo + (int) std::floor((<span class="keywordtype">double</span>) (hiExclusive - lo)</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  * <a class="code" href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">randUniformDist</a>(randGen));</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a4ad431d20545de6887998188074989af"> 88</a></span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="namespacemlpack_1_1math.html#a4ad431d20545de6887998188074989af">RandNormal</a>()</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>  <span class="keywordflow">return</span> <a class="code" href="namespacemlpack_1_1math.html#a8f912bbb6f93ae030cee1a0a2c95322a">randNormalDist</a>(randGen);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00100"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a731e1fe0fb09c263299222a594a73e7f"> 100</a></span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="namespacemlpack_1_1math.html#a4ad431d20545de6887998188074989af">RandNormal</a>(<span class="keyword">const</span> <span class="keywordtype">double</span> mean, <span class="keyword">const</span> <span class="keywordtype">double</span> variance)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> variance * <a class="code" href="namespacemlpack_1_1math.html#a8f912bbb6f93ae030cee1a0a2c95322a">randNormalDist</a>(randGen) + mean;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div><div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="namespacemlpack_1_1math.html#a9f6fa0072288d9c1139394683e0c3636"> 114</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespacemlpack_1_1math.html#a9f6fa0072288d9c1139394683e0c3636">ObtainDistinctSamples</a>(<span class="keyword">const</span> <span class="keywordtype">size_t</span> loInclusive,</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> hiExclusive,</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> maxNumSamples,</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  arma::uvec& distinctSamples)</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="keyword">const</span> <span class="keywordtype">size_t</span> samplesRangeSize = hiExclusive - loInclusive;</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="keywordflow">if</span> (samplesRangeSize > maxNumSamples)</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  arma::Col<size_t> samples;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  samples.zeros(samplesRangeSize);</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="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < maxNumSamples; i++)</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  samples [ (<span class="keywordtype">size_t</span>) <a class="code" href="namespacemlpack_1_1math.html#aad090ac225728d74c1b66bcf52f3ab95">math::RandInt</a>(samplesRangeSize) ]++;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  distinctSamples = arma::find(samples > 0);</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>  <span class="keywordflow">if</span> (loInclusive > 0)</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  distinctSamples += loInclusive;</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>  <span class="keywordflow">else</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  {</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  distinctSamples.set_size(samplesRangeSize);</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < samplesRangeSize; i++)</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  distinctSamples[i] = loInclusive + i;</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> }</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> } <span class="comment">// namespace math</span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> } <span class="comment">// namespace mlpack</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="preprocessor">#endif // MLPACK_CORE_MATH_MATH_LIB_HPP</span></div><div class="ttc" id="namespacemlpack_1_1math_html_a9f6fa0072288d9c1139394683e0c3636"><div class="ttname"><a href="namespacemlpack_1_1math.html#a9f6fa0072288d9c1139394683e0c3636">mlpack::math::ObtainDistinctSamples</a></div><div class="ttdeci">void ObtainDistinctSamples(const size_t loInclusive, const size_t hiExclusive, const size_t maxNumSamples, arma::uvec &distinctSamples)</div><div class="ttdoc">Obtains no more than maxNumSamples distinct samples. </div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00114">random.hpp:114</a></div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_a72f615dab4a3f2b91aa80d4e817714b6"><div class="ttname"><a href="namespacemlpack_1_1math.html#a72f615dab4a3f2b91aa80d4e817714b6">mlpack::math::randUniformDist</a></div><div class="ttdeci">MLPACK_EXPORT std::uniform_real_distribution randUniformDist</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="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="namespacemlpack_1_1math_html_a99560c3cf9c2db393309a31933b8d480"><div class="ttname"><a href="namespacemlpack_1_1math.html#a99560c3cf9c2db393309a31933b8d480">mlpack::math::RandomSeed</a></div><div class="ttdeci">void RandomSeed(const size_t seed)</div><div class="ttdoc">Set the random seed used by the random functions (Random() and RandInt()). </div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00040">random.hpp:40</a></div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_a4ad431d20545de6887998188074989af"><div class="ttname"><a href="namespacemlpack_1_1math.html#a4ad431d20545de6887998188074989af">mlpack::math::RandNormal</a></div><div class="ttdeci">double RandNormal()</div><div class="ttdoc">Generates a normally distributed random number with mean 0 and variance 1. </div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00088">random.hpp:88</a></div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_a305db122ade561ba1fe874bd51e9797d"><div class="ttname"><a href="namespacemlpack_1_1math.html#a305db122ade561ba1fe874bd51e9797d">mlpack::math::Random</a></div><div class="ttdeci">double Random()</div><div class="ttdoc">Generates a uniform random number between 0 and 1. </div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00055">random.hpp:55</a></div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_a8f912bbb6f93ae030cee1a0a2c95322a"><div class="ttname"><a href="namespacemlpack_1_1math.html#a8f912bbb6f93ae030cee1a0a2c95322a">mlpack::math::randNormalDist</a></div><div class="ttdeci">MLPACK_EXPORT std::normal_distribution randNormalDist</div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_aad090ac225728d74c1b66bcf52f3ab95"><div class="ttname"><a href="namespacemlpack_1_1math.html#aad090ac225728d74c1b66bcf52f3ab95">mlpack::math::RandInt</a></div><div class="ttdeci">int RandInt(const int hiExclusive)</div><div class="ttdoc">Generates a uniform random integer. </div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00071">random.hpp:71</a></div></div>
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<div class="ttc" id="namespacemlpack_1_1math_html_a6bcdf252b96b6e681108f1ec9e81ae06"><div class="ttname"><a href="namespacemlpack_1_1math.html#a6bcdf252b96b6e681108f1ec9e81ae06">mlpack::math::randGen</a></div><div class="ttdeci">MLPACK_EXPORT std::mt19937 randGen</div><div class="ttdoc">MLPACK_EXPORT is required for global variables; it exports the symbols correctly on Windows...</div></div>
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