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<div class="title">/data/users/matthijs/github_faiss/faiss/ProductQuantizer.cpp</div> </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This source code is licensed under the BSD+Patents license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/* Copyright 2004-present Facebook. All Rights Reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> Index based on product quantiztion.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "ProductQuantizer.h"</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <cstddef></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <cstring></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <cstdio></span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <algorithm></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="preprocessor">#include "FaissAssert.h"</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "VectorTransform.h"</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "IndexFlat.h"</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "utils.h"</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/* declare BLAS functions, see http://www.netlib.org/clapack/cblas/ */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keywordtype">int</span> sgemm_ (<span class="keyword">const</span> <span class="keywordtype">char</span> *transa, <span class="keyword">const</span> <span class="keywordtype">char</span> *transb, FINTEGER *m, FINTEGER *</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  n, FINTEGER *k, <span class="keyword">const</span> <span class="keywordtype">float</span> *alpha, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  FINTEGER *lda, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, FINTEGER *</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  ldb, <span class="keywordtype">float</span> *beta, <span class="keywordtype">float</span> *c, FINTEGER *ldc);</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">namespace </span>faiss {</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> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">/* compute an estimator using look-up tables for typical values of M */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CT, <span class="keyword">class</span> C></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keywordtype">void</span> pq_estimators_from_tables_Mmul4 (<span class="keywordtype">int</span> M, <span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dis_table,</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">size_t</span> ksub,</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < ncodes; j++) {</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *dt = dis_table;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m < M; m+=4) {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">float</span> dism = 0;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  dism = dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  dism += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  dis += dism;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  heap_pop<C> (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  heap_push<C> (k, heap_dis, heap_ids, dis, j);</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>  }</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="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CT, <span class="keyword">class</span> C></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="keywordtype">void</span> pq_estimators_from_tables_M4 (<span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dis_table,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">size_t</span> ksub,</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < ncodes; j++) {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *dt = dis_table;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  dis = dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  dis += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  dis += dt[*codes++]; dt += ksub;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  dis += dt[*codes++];</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  heap_pop<C> (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  heap_push<C> (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> }</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> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CT, <span class="keyword">class</span> C></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> pq_estimators_from_tables (<span class="keyword">const</span> ProductQuantizer * pq,</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">const</span> CT * codes,</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * dis_table,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordtype">float</span> * heap_dis,</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">long</span> * heap_ids)</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (pq->M == 4) {</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>  pq_estimators_from_tables_M4<CT, C> (codes, ncodes,</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  dis_table, pq->ksub, k,</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  heap_dis, heap_ids);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</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> (pq->M % 4 == 0) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  pq_estimators_from_tables_Mmul4<CT, C> (pq->M, codes, ncodes,</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  dis_table, pq->ksub, k,</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  heap_dis, heap_ids);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</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> </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">/* Default is relatively slow */</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> M = pq->M;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> ksub = pq->ksub;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < ncodes; j++) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict dt = dis_table;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < M; m++) {</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  dis += dt[*codes++];</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  dt += ksub;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">if</span> (C::cmp (heap_dis[0], dis)) {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  heap_pop<C> (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  heap_push<C> (k, heap_dis, heap_ids, dis, j);</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> }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</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="comment">/*********************************************</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * PQ implementation</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> *********************************************/</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> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> ProductQuantizer::ProductQuantizer (<span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> M, <span class="keywordtype">size_t</span> nbits):</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  d(d), M(M), nbits(nbits), assign_index(nullptr)</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  set_derived_values ();</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> }</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> ProductQuantizer::ProductQuantizer ():</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  d(0), M(1), nbits(0), assign_index(nullptr)</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  set_derived_values ();</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> }</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce"> 166</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce">ProductQuantizer::set_derived_values</a> () {</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// quite a few derived values</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> % M == 0);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> / <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> = (<a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a> + 7) / 8;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  ksub = 1 << <a class="code" href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">nbits</a>;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#aab1109a29ba0544358e274d727b23cae">centroids</a>.resize (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a> * ksub);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a> = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  train_type = Train_default;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> }</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775"> 179</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">ProductQuantizer::set_params</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * centroids_, <span class="keywordtype">int</span> m)</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  memcpy (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0), centroids_,</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> * <span class="keyword">sizeof</span> (centroids_[0]));</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> }</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="keyword">static</span> <span class="keywordtype">void</span> init_hypercube (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> nbits,</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordtype">float</span> *centroids)</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> {</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  std::vector<float> mean (d);</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++)</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < d; j++)</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  mean [j] += x[i * d + j];</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordtype">float</span> maxm = 0;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < d; j++) {</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  mean [j] /= n;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (fabs(mean[j]) > maxm) maxm = fabs(mean[j]);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  }</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < (1 << nbits); i++) {</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">float</span> * cent = centroids + i * d;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < nbits; j++)</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  cent[j] = mean [j] + (((i >> j) & 1) ? 1 : -1) * maxm;</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = nbits; j < d; j++)</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  cent[j] = mean [j];</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  }</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> }</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">static</span> <span class="keywordtype">void</span> init_hypercube_pca (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> nbits,</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordtype">float</span> *centroids)</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> {</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  PCAMatrix pca (d, nbits);</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  pca.train (n, x);</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < (1 << nbits); i++) {</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordtype">float</span> * cent = centroids + i * d;</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < d; j++) {</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  cent[j] = pca.mean[j];</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordtype">float</span> f = 1.0;</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < nbits; k++)</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  cent[j] += f *</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  sqrt (pca.eigenvalues [k]) *</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  (((i >> k) & 1) ? 1 : -1) *</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  pca.PCAMat [j + k * d];</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  }</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  }</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> </div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> }</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="keywordtype">void</span> ProductQuantizer::train (<span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> * x)</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> {</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">if</span> (train_type != <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d">Train_shared</a>) {</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35">train_type_t</a> final_train_type;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  final_train_type = train_type;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">if</span> (train_type == <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">Train_hypercube</a> ||</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  train_type == <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">Train_hypercube_pca</a>) {</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a> < nbits) {</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  final_train_type = Train_default;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  printf (<span class="stringliteral">"cannot train hypercube: nbits=%ld > log2(d=%ld)\n"</span>,</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  nbits, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>);</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordtype">float</span> * xslice = <span class="keyword">new</span> <span class="keywordtype">float</span>[n * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>];</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  ScopeDeleter<float> del (xslice);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < n; j++)</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  memcpy (xslice + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>,</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  x + j * d + m * dsub,</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  dsub * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  Clustering clus (dsub, ksub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">cp</a>);</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="comment">// we have some initialization for the centroids</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">if</span> (final_train_type != Train_default) {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  clus.centroids.resize (dsub * ksub);</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  }</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">switch</span> (final_train_type) {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">case</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">Train_hypercube</a>:</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  init_hypercube (dsub, nbits, n, xslice,</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  clus.centroids.data ());</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">case</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">Train_hypercube_pca</a>:</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  init_hypercube_pca (dsub, nbits, n, xslice,</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  clus.centroids.data ());</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">case</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0">Train_hot_start</a>:</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  memcpy (clus.centroids.data(),</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a> (m, 0),</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  dsub * ksub * <span class="keyword">sizeof</span> (float));</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">default</span>: ;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  }</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">if</span>(<a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a>) {</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  clus.verbose = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  printf (<span class="stringliteral">"Training PQ slice %d/%zd\n"</span>, m, M);</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  }</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  IndexFlatL2 index (dsub);</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  clus.train (n, xslice, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> ? *<a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> : index);</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">set_params</a> (clus.centroids.data(), m);</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  Clustering clus (dsub, ksub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">cp</a>);</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordflow">if</span>(<a class="code" href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">verbose</a>) {</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  clus.verbose = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  printf (<span class="stringliteral">"Training all PQ slices at once\n"</span>);</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> </div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  IndexFlatL2 index (dsub);</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> </div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  clus.train (n * M, x, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> ? *<a class="code" href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">assign_index</a> : index);</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">set_params</a> (clus.centroids.data(), m);</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  }</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  }</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> }</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div>
<div class="line"><a name="l00312"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838"> 312</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">ProductQuantizer::compute_code</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x, uint8_t * code)<span class="keyword"> const</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordtype">float</span> distances [<a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>];</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordtype">float</span> mindis = 1e20;</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordtype">int</span> idxm = -1;</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * xsub = x + m * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  fvec_L2sqr_ny (distances, xsub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0), dsub, ksub);</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> </div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="comment">/* Find best centroid */</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">for</span> (i = 0; i < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; i++) {</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordtype">float</span> dis = distances [i];</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordflow">if</span> (dis < mindis) {</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  mindis = dis;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  idxm = i;</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  }</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordflow">switch</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a>) {</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keywordflow">case</span> 1: code[m] = (uint8_t) idxm; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">case</span> 2: ((uint16_t *) code)[m] = (uint16_t) idxm; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  }</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  }</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> </div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> }</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div>
<div class="line"><a name="l00339"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208"> 339</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">ProductQuantizer::decode</a> (<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x)<span class="keyword"> const</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 1) {</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  memcpy (x + m * dsub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, code[m]),</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>) * dsub);</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  }</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <span class="keyword">const</span> uint16_t *c = (<span class="keyword">const</span> uint16_t*) code;</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  memcpy (x + m * dsub, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, c[m]),</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>) * dsub);</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  }</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  }</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> }</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> </div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">ProductQuantizer::decode</a> (<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> n)<span class="keyword"> const</span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  this-><a class="code" href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">decode</a> (code + <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a> * i, x + d * i);</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  }</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> }</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> </div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> </div>
<div class="line"><a name="l00364"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316"> 364</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">ProductQuantizer::compute_code_from_distance_table</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> *tab,</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  uint8_t *code)<span class="keyword"> const</span></div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordtype">float</span> mindis = 1e20;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <span class="keywordtype">int</span> idxm = -1;</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> </div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="comment">/* Find best centroid */</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; j++) {</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="keywordtype">float</span> dis = *tab++;</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="keywordflow">if</span> (dis < mindis) {</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  mindis = dis;</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  idxm = j;</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  }</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  }</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  <span class="keywordflow">switch</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a>) {</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keywordflow">case</span> 1: code[m] = (uint8_t) idxm; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="keywordflow">case</span> 2: ((uint16_t *) code)[m] = (uint16_t) idxm; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  }</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  }</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> }</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> </div>
<div class="line"><a name="l00386"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1"> 386</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">ProductQuantizer::compute_codes</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  uint8_t * codes,</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  <span class="keywordtype">size_t</span> n)<span class="keyword"> const</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordflow">if</span> (dsub < 16) { <span class="comment">// simple direct computation</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> </div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++)</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">compute_code</a> (x + i * d, codes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>);</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> </div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  } <span class="keywordflow">else</span> { <span class="comment">// worthwile to use BLAS</span></div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordtype">float</span> *dis_tables = <span class="keyword">new</span> <span class="keywordtype">float</span> [n * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>];</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter<float></a> del (dis_tables);</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">compute_distance_tables</a> (n, x, dis_tables);</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span> </div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  uint8_t * code = codes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * tab = dis_tables + i * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">compute_code_from_distance_table</a> (tab, code);</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  }</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> }</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span> </div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> </div>
<div class="line"><a name="l00411"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09"> 411</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">ProductQuantizer::compute_distance_table</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="keywordtype">float</span> * dis_table)<span class="keyword"> const</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  <span class="keywordtype">size_t</span> m;</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> </div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="keywordflow">for</span> (m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  fvec_L2sqr_ny (dis_table + m * ksub,</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  x + m * dsub,</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0),</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  dsub,</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  ksub);</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  }</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> }</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> </div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="keywordtype">void</span> ProductQuantizer::compute_inner_prod_table (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="keywordtype">float</span> * dis_table)<span class="keyword"> const</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  <span class="keywordtype">size_t</span> m;</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> </div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">for</span> (m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  fvec_inner_products_ny (dis_table + m * ksub,</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  x + m * dsub,</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">get_centroids</a>(m, 0),</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  dsub,</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  ksub);</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  }</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> }</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> </div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> </div>
<div class="line"><a name="l00440"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207"> 440</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">ProductQuantizer::compute_distance_tables</a> (</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  <span class="keywordtype">float</span> * dis_tables)<span class="keyword"> const</span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> </div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keywordflow">if</span> (dsub < 16) {</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> </div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nx; i++) {</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">compute_distance_table</a> (x + i * d, dis_tables + i * ksub * M);</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  }</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> </div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  } <span class="keywordflow">else</span> { <span class="comment">// use BLAS</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> </div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <a class="code" href="namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57">pairwise_L2sqr</a> (dsub,</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  nx, x + dsub * m,</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  ksub, centroids.data() + m * dsub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>,</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  dis_tables + ksub * m,</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a>, <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>, ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>);</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  }</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  }</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> }</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> </div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> <span class="keywordtype">void</span> ProductQuantizer::compute_inner_prod_tables (</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <span class="keywordtype">float</span> * dis_tables)<span class="keyword"> const</span></div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> </div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  <span class="keywordflow">if</span> (dsub < 16) {</div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> </div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nx; i++) {</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  compute_inner_prod_table (x + i * d, dis_tables + i * ksub * M);</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  }</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> </div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  } <span class="keywordflow">else</span> { <span class="comment">// use BLAS</span></div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> </div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  <span class="comment">// compute distance tables</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  FINTEGER ldc = ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>, nxi = nx, ksubi = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>,</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  dsubi = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>, di = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">d</a>;</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="keywordtype">float</span> one = 1.0, zero = 0;</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> </div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  sgemm_ (<span class="stringliteral">"Transposed"</span>, <span class="stringliteral">"Not transposed"</span>,</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  &ksubi, &nxi, &dsubi,</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  &one, &centroids [m * dsub * ksub], &dsubi,</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  x + dsub * m, &di,</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  &zero, dis_tables + ksub * m, &ldc);</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  }</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> </div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  }</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span> }</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span> </div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CT, <span class="keyword">class</span> C></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span> <span class="keyword">static</span> <span class="keywordtype">void</span> pq_knn_search_with_tables (</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  <span class="keyword">const</span> ProductQuantizer * pq,</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *dis_tables,</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  HeapArray<C> * res,</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  <span class="keywordtype">bool</span> init_finalize_heap)</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span> {</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <span class="keywordtype">size_t</span> k = res->k, nx = res->nh;</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  <span class="keywordtype">size_t</span> ksub = pq->ksub, M = pq->M;</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> </div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> </div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nx; i++) {</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="comment">/* query preparation for asymmetric search: compute look-up tables */</span></div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  <span class="keyword">const</span> <span class="keywordtype">float</span>* dis_table = dis_tables + i * ksub * M;</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span> </div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  <span class="comment">/* Compute distances and keep smallest values */</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="keywordtype">long</span> * __restrict heap_ids = res->ids + i * k;</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="keywordtype">float</span> * __restrict heap_dis = res->val + i * k;</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span> </div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keywordflow">if</span> (init_finalize_heap) {</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  heap_heapify<C> (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  }</div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span> </div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  pq_estimators_from_tables<CT, C> (pq,</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  (CT*)codes, ncodes,</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  dis_table,</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="keywordflow">if</span> (init_finalize_heap) {</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  heap_reorder<C> (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  }</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  }</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span> }</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span> </div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> <span class="comment">static inline void pq_estimators_from_tables (const ProductQuantizer * pq,</span></div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span> <span class="comment"> const CT * codes,</span></div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> <span class="comment"> size_t ncodes,</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> <span class="comment"> const float * dis_table,</span></div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> <span class="comment"> size_t k,</span></div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span> <span class="comment"> float * heap_dis,</span></div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> <span class="comment"> long * heap_ids)</span></div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00541"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b"> 541</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b">ProductQuantizer::search</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict x,</div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_maxheap_array_t</a> * res,</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  FAISS_THROW_IF_NOT (nx == res-><a class="code" href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">nh</a>);</div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  <span class="keywordtype">float</span> * dis_tables = <span class="keyword">new</span> <span class="keywordtype">float</span> [nx * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>];</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter<float></a> del(dis_tables);</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">compute_distance_tables</a> (nx, x, dis_tables);</div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> </div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 1) {</div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span> </div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  pq_knn_search_with_tables<uint8_t, CMax<float, long> > (</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  <span class="keyword">this</span>, dis_tables, codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span> </div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 2) {</div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  pq_knn_search_with_tables<uint16_t, CMax<float, long> > (</div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  <span class="keyword">this</span>, dis_tables, codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span> </div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  }</div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span> </div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span> }</div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span> </div>
<div class="line"><a name="l00566"></a><span class="lineno"><a class="line" href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6"> 566</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6">ProductQuantizer::search_ip</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * __restrict x,</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <span class="keywordtype">size_t</span> nx,</div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  <span class="keyword">const</span> uint8_t * codes,</div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> ncodes,</div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_minheap_array_t</a> * res,</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  FAISS_THROW_IF_NOT (nx == res-><a class="code" href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">nh</a>);</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  <span class="keywordtype">float</span> * dis_tables = <span class="keyword">new</span> <span class="keywordtype">float</span> [nx * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>];</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <a class="code" href="structfaiss_1_1ScopeDeleter.html">ScopeDeleter<float></a> del(dis_tables);</div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  compute_inner_prod_tables (nx, x, dis_tables);</div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span> </div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 1) {</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span> </div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  pq_knn_search_with_tables<uint8_t, CMin<float, long> > (</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  <span class="keyword">this</span>, dis_tables, codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span> </div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 2) {</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  pq_knn_search_with_tables<uint16_t, CMin<float, long> > (</div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="keyword">this</span>, dis_tables, codes, ncodes, res, init_finalize_heap);</div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  }</div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span> </div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span> }</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span> </div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span> </div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span> </div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span> <span class="keyword">static</span> <span class="keywordtype">float</span> sqr (<span class="keywordtype">float</span> x) {</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  <span class="keywordflow">return</span> x * x;</div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span> }</div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span> </div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span> <span class="keywordtype">void</span> ProductQuantizer::compute_sdc_table ()</div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span> {</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.resize (M * ksub * ksub);</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span> </div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span> </div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *cents = centroids.data() + m * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  <span class="keywordtype">float</span> * dis_tab = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.data() + m * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>;</div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span> </div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  <span class="comment">// TODO optimize with BLAS</span></div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; i++) {</div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *centi = cents + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>; j++) {</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  <span class="keywordtype">float</span> accu = 0;</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *centj = cents + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>;</div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">dsub</a>; k++)</div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  accu += sqr (centi[k] - centj[k]);</div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  dis_tab [i + j * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>] = accu;</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  }</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  }</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  }</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span> }</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span> </div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span> <span class="keywordtype">void</span> ProductQuantizer::search_sdc (<span class="keyword">const</span> uint8_t * qcodes,</div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  <span class="keywordtype">size_t</span> nq,</div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  <span class="keyword">const</span> uint8_t * bcodes,</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> nb,</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  float_maxheap_array_t * res,</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  <span class="keywordtype">bool</span> init_finalize_heap)<span class="keyword"> const</span></div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.size() == M * ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>);</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">byte_per_idx</a> == 1);</div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  <span class="keywordtype">size_t</span> k = res->k;</div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span> </div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span> </div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nq; i++) {</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span> </div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  <span class="comment">/* Compute distances and keep smallest values */</span></div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  <span class="keywordtype">long</span> * heap_ids = res->ids + i * k;</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  <span class="keywordtype">float</span> * heap_dis = res->val + i * k;</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="keyword">const</span> uint8_t * qcode = qcodes + i * <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span> </div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  <span class="keywordflow">if</span> (init_finalize_heap)</div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  maxheap_heapify (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span> </div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  <span class="keyword">const</span> uint8_t * bcode = bcodes;</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < nb; j++) {</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  <span class="keywordtype">float</span> dis = 0;</div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * tab = <a class="code" href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">sdc_table</a>.data();</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> m = 0; m < <a class="code" href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">M</a>; m++) {</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  dis += tab[bcode[m] + qcode[m] * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>];</div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  tab += ksub * <a class="code" href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">ksub</a>;</div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  }</div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  <span class="keywordflow">if</span> (dis < heap_dis[0]) {</div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  maxheap_pop (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  maxheap_push (k, heap_dis, heap_ids, dis, j);</div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  }</div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  bcode += <a class="code" href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">code_size</a>;</div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  }</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span> </div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <span class="keywordflow">if</span> (init_finalize_heap)</div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  maxheap_reorder (k, heap_dis, heap_ids);</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  }</div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span> </div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span> }</div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> </div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span> </div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span> </div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span> </div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span> </div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span> </div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span> } <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ad291f113c6d44a634ddc1972f9a3c775"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ad291f113c6d44a634ddc1972f9a3c775">faiss::ProductQuantizer::set_params</a></div><div class="ttdeci">void set_params(const float *centroids, int m)</div><div class="ttdoc">Define the centroids for subquantizer m. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00179">ProductQuantizer.cpp:179</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a6b330bc2cfa02a402d002d657f214931">faiss::ProductQuantizer::Train_hypercube_pca</a></div><div class="ttdoc">intialize centroids with nbits-D hypercube </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00045">ProductQuantizer.h:45</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ac920fea11f02e8407d12cc99a09f5ea5"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ac920fea11f02e8407d12cc99a09f5ea5">faiss::ProductQuantizer::nbits</a></div><div class="ttdeci">size_t nbits</div><div class="ttdoc">number of bits per quantization index </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00029">ProductQuantizer.h:29</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a7afbf9d96276f021981e99f064254208"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a7afbf9d96276f021981e99f064254208">faiss::ProductQuantizer::decode</a></div><div class="ttdeci">void decode(const uint8_t *code, float *x) const </div><div class="ttdoc">decode a vector from a given code (or n vectors if third argument) </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00339">ProductQuantizer.cpp:339</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a13bf69a0dc7b4e45792d10f458e4a92d"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a13bf69a0dc7b4e45792d10f458e4a92d">faiss::ProductQuantizer::byte_per_idx</a></div><div class="ttdeci">size_t byte_per_idx</div><div class="ttdoc">nb bytes per code component (1 or 2) </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00033">ProductQuantizer.h:33</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35ac8040c8792a014a2ea7188583575013e">faiss::ProductQuantizer::Train_hypercube</a></div><div class="ttdoc">intialize centroids with nbits-D hypercube </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00044">ProductQuantizer.h:44</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ab3067f333b26811537a8519fb08292ce"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ab3067f333b26811537a8519fb08292ce">faiss::ProductQuantizer::set_derived_values</a></div><div class="ttdeci">void set_derived_values()</div><div class="ttdoc">compute derived values when d, M and nbits have been set </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00166">ProductQuantizer.cpp:166</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a6bd65fb4407452f73acb7242931d09e4"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a6bd65fb4407452f73acb7242931d09e4">faiss::ProductQuantizer::sdc_table</a></div><div class="ttdeci">std::vector< float > sdc_table</div><div class="ttdoc">Symmetric Distance Table. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00159">ProductQuantizer.h:159</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35aa1aefc6c08f0ca974de9f59d9557aa0d">faiss::ProductQuantizer::Train_shared</a></div><div class="ttdoc">share dictionary accross PQ segments </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00043">ProductQuantizer.h:43</a></div></div>
<div class="ttc" id="structfaiss_1_1ScopeDeleter_html"><div class="ttname"><a href="structfaiss_1_1ScopeDeleter.html">faiss::ScopeDeleter</a></div><div class="ttdef"><b>Definition:</b> <a href="FaissException_8h_source.html#l00039">FaissException.h:39</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a467b451ca203544e42c250e4be65b983"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a467b451ca203544e42c250e4be65b983">faiss::ProductQuantizer::dsub</a></div><div class="ttdeci">size_t dsub</div><div class="ttdoc">dimensionality of each subvector </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00032">ProductQuantizer.h:32</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3521b9a36c28219fd6180cc7a9ce8207"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3521b9a36c28219fd6180cc7a9ce8207">faiss::ProductQuantizer::compute_distance_tables</a></div><div class="ttdeci">void compute_distance_tables(size_t nx, const float *x, float *dis_tables) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00440">ProductQuantizer.cpp:440</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a95060fedd7c09eb20e968fd2fdb4b316"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a95060fedd7c09eb20e968fd2fdb4b316">faiss::ProductQuantizer::compute_code_from_distance_table</a></div><div class="ttdeci">void compute_code_from_distance_table(const float *tab, uint8_t *code) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00364">ProductQuantizer.cpp:364</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_ae5a340ee5a4b1d35a565b167de2a2ef1"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#ae5a340ee5a4b1d35a565b167de2a2ef1">faiss::ProductQuantizer::compute_codes</a></div><div class="ttdeci">void compute_codes(const float *x, uint8_t *codes, size_t n) const </div><div class="ttdoc">same as compute_code for several vectors </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00386">ProductQuantizer.cpp:386</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a36361f41bcd2fa698f3c39eb7111ed09"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a36361f41bcd2fa698f3c39eb7111ed09">faiss::ProductQuantizer::compute_distance_table</a></div><div class="ttdeci">void compute_distance_table(const float *x, float *dis_table) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00411">ProductQuantizer.cpp:411</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a1ae7892a15b9f6809a3ba1a123a7831b"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a1ae7892a15b9f6809a3ba1a123a7831b">faiss::ProductQuantizer::search</a></div><div class="ttdeci">void search(const float *x, size_t nx, const uint8_t *codes, const size_t ncodes, float_maxheap_array_t *res, bool init_finalize_heap=true) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00541">ProductQuantizer.cpp:541</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_aa61330eadb84772b71018b093773a5f9"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#aa61330eadb84772b71018b093773a5f9">faiss::ProductQuantizer::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">byte per indexed vector </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00034">ProductQuantizer.h:34</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a62def246cfef670f2973fdf4af1414e1"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a62def246cfef670f2973fdf4af1414e1">faiss::ProductQuantizer::assign_index</a></div><div class="ttdeci">Index * assign_index</div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00053">ProductQuantizer.h:53</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a0feee45e4151547b7a0444c14bad398f"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a0feee45e4151547b7a0444c14bad398f">faiss::ProductQuantizer::ksub</a></div><div class="ttdeci">size_t ksub</div><div class="ttdoc">number of centroids for each subquantizer </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00035">ProductQuantizer.h:35</a></div></div>
<div class="ttc" id="structfaiss_1_1HeapArray_html"><div class="ttname"><a href="structfaiss_1_1HeapArray.html">faiss::HeapArray</a></div><div class="ttdef"><b>Definition:</b> <a href="Heap_8h_source.html#l00350">Heap.h:350</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a66be226806ca2abcaaf1653cdc690aa6"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a66be226806ca2abcaaf1653cdc690aa6">faiss::ProductQuantizer::search_ip</a></div><div class="ttdeci">void search_ip(const float *x, size_t nx, const uint8_t *codes, const size_t ncodes, float_minheap_array_t *res, bool init_finalize_heap=true) const </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00566">ProductQuantizer.cpp:566</a></div></div>
<div class="ttc" id="namespacefaiss_html_a3d9c7db82d43c1f0ab1d28b92bc9fe57"><div class="ttname"><a href="namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57">faiss::pairwise_L2sqr</a></div><div class="ttdeci">void pairwise_L2sqr(long d, long nq, const float *xq, long nb, const float *xb, float *dis, long ldq, long ldb, long ldd)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01344">utils.cpp:1344</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a08b130e3a21f2699a4e3bbec121fb838"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a08b130e3a21f2699a4e3bbec121fb838">faiss::ProductQuantizer::compute_code</a></div><div class="ttdeci">void compute_code(const float *x, uint8_t *code) const </div><div class="ttdoc">Quantize one vector with the product quantizer. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8cpp_source.html#l00312">ProductQuantizer.cpp:312</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35a4960d143d2aa49cf92028cf3470c47a0">faiss::ProductQuantizer::Train_hot_start</a></div><div class="ttdoc">the centroids are already initialized </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00042">ProductQuantizer.h:42</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_af265acf5aa1bcda60898002287e6a3d6"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#af265acf5aa1bcda60898002287e6a3d6">faiss::ProductQuantizer::cp</a></div><div class="ttdeci">ClusteringParameters cp</div><div class="ttdoc">parameters used during clustering </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00049">ProductQuantizer.h:49</a></div></div>
<div class="ttc" id="structfaiss_1_1HeapArray_html_aad477a3907c3496159eaf4b375be4432"><div class="ttname"><a href="structfaiss_1_1HeapArray.html#aad477a3907c3496159eaf4b375be4432">faiss::HeapArray::nh</a></div><div class="ttdeci">size_t nh</div><div class="ttdoc">number of heaps </div><div class="ttdef"><b>Definition:</b> <a href="Heap_8h_source.html#l00354">Heap.h:354</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a83600e328893ce5f41fe459f5a3acf41"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a83600e328893ce5f41fe459f5a3acf41">faiss::ProductQuantizer::M</a></div><div class="ttdeci">size_t M</div><div class="ttdoc">number of subquantizers </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00028">ProductQuantizer.h:28</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a4f0f33c011dffe633a1748a48a082c22"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a4f0f33c011dffe633a1748a48a082c22">faiss::ProductQuantizer::get_centroids</a></div><div class="ttdeci">float * get_centroids(size_t m, size_t i)</div><div class="ttdoc">return the centroids associated with subvector m </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00059">ProductQuantizer.h:59</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a567cd512438f9e3404d9339a232d7695"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a567cd512438f9e3404d9339a232d7695">faiss::ProductQuantizer::d</a></div><div class="ttdeci">size_t d</div><div class="ttdoc">size of the input vectors </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00027">ProductQuantizer.h:27</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a1e4056fa3938ed8c9fe701e90d94ad95"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a1e4056fa3938ed8c9fe701e90d94ad95">faiss::ProductQuantizer::verbose</a></div><div class="ttdeci">bool verbose</div><div class="ttdoc">verbose during training? </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00036">ProductQuantizer.h:36</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_aab1109a29ba0544358e274d727b23cae"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#aab1109a29ba0544358e274d727b23cae">faiss::ProductQuantizer::centroids</a></div><div class="ttdeci">std::vector< float > centroids</div><div class="ttdoc">Centroid table, size M * ksub * dsub. </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00056">ProductQuantizer.h:56</a></div></div>
<div class="ttc" id="structfaiss_1_1ProductQuantizer_html_a3a41c6286095e731be744548d9535a35"><div class="ttname"><a href="structfaiss_1_1ProductQuantizer.html#a3a41c6286095e731be744548d9535a35">faiss::ProductQuantizer::train_type_t</a></div><div class="ttdeci">train_type_t</div><div class="ttdoc">initialization </div><div class="ttdef"><b>Definition:</b> <a href="ProductQuantizer_8h_source.html#l00040">ProductQuantizer.h:40</a></div></div>
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