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<div class="title">/data/users/matthijs/github_faiss/faiss/utils.h</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> <span class="comment"></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"> * -*- c++ -*-</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> <span class="comment"> * A few utilitary functions for similarity search:</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * - random generators</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * - optimized exhaustive distance and knn search functions</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * - some functions reimplemented from torch for speed</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#ifndef FAISS_utils_h</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor"></span><span class="preprocessor">#define FAISS_utils_h</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// for the random data struct</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <cstdlib></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "Heap.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">namespace </span>faiss {</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> </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">/**************************************************</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * Get some stats about the system</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">**************************************************/</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">/// ms elapsed since some arbitrary epoch</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"></span><span class="keywordtype">double</span> <a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a> ();</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">/// get current RSS usage in kB</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"></span><span class="keywordtype">size_t</span> <a class="code" href="namespacefaiss.html#aa3af5769b0b649f112332a874c64d361">get_mem_usage_kb</a> ();</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> <span class="comment">/**************************************************</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * Random data generation functions</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> **************************************************/</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">/// random generator that can be used in multithreaded contexts</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="structfaiss_1_1RandomGenerator.html"> 48</a></span> <span class="comment"></span><span class="keyword">struct </span><a class="code" href="structfaiss_1_1RandomGenerator.html">RandomGenerator</a> {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#ifdef __linux__</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor"></span> <span class="keywordtype">char</span> rand_state [8];</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">struct </span>random_data rand_data;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#elif __APPLE__</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor"></span> <span class="keywordtype">unsigned</span> rand_state;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> /// random 31-bit positive integer</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"></span> <span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420">rand_int</a> ();</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> /// random long < 2 ^ 62</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span> <span class="keywordtype">long</span> <a class="code" href="structfaiss_1_1RandomGenerator.html#acbceaa8b017793ca4f8d90e644b0d7f4">rand_long</a> ();</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"></span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> /// generate random number between 0 and max-1</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span> <span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420">rand_int</a> (<span class="keywordtype">int</span> max);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"></span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> /// between 0 and 1</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="structfaiss_1_1RandomGenerator.html#ac82a433d7bfa56d750907ba5cf74aed7">rand_float</a> ();</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> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordtype">double</span> rand_double ();</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> /// initialize</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"></span> <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1RandomGenerator.html#a7633c373153f3b2824d2d99382ba20ab">RandomGenerator</a> (<span class="keywordtype">long</span> seed = 1234);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> /// default copy constructor messes up pointer in rand_data</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span> <a class="code" href="structfaiss_1_1RandomGenerator.html#a7633c373153f3b2824d2d99382ba20ab">RandomGenerator</a> (<span class="keyword">const</span> <a class="code" href="structfaiss_1_1RandomGenerator.html">RandomGenerator</a> & other);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> };</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/* Generate an array of uniform random floats / multi-threaded implementation */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="keywordtype">void</span> float_rand (<span class="keywordtype">float</span> * x, <span class="keywordtype">size_t</span> n, <span class="keywordtype">long</span> seed);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keywordtype">void</span> float_randn (<span class="keywordtype">float</span> * x, <span class="keywordtype">size_t</span> n, <span class="keywordtype">long</span> seed);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keywordtype">void</span> long_rand (<span class="keywordtype">long</span> * x, <span class="keywordtype">size_t</span> n, <span class="keywordtype">long</span> seed);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="keywordtype">void</span> byte_rand (uint8_t * x, <span class="keywordtype">size_t</span> n, <span class="keywordtype">long</span> seed);</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> <span class="comment">/* random permutation */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">void</span> rand_perm (<span class="keywordtype">int</span> * perm, <span class="keywordtype">size_t</span> n, <span class="keywordtype">long</span> seed);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">/*********************************************************</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * Optimized distance/norm/inner prod computations</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> *********************************************************/</span></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="comment"></span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">/// Squared L2 distance between two vectors</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"></span><span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">size_t</span> d);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">/* SSE-implementation of inner product and L2 distance */</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="keywordtype">float</span> fvec_inner_product (</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">size_t</span> d);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"></span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment">/// a balanced assignment has a IF of 1</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"></span><span class="keywordtype">double</span> <a class="code" href="namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714">imbalance_factor</a> (<span class="keywordtype">int</span> n, <span class="keywordtype">int</span> k, <span class="keyword">const</span> <span class="keywordtype">long</span> *assign);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">/// same, takes a histogram as input</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span><span class="keywordtype">double</span> <a class="code" href="namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714">imbalance_factor</a> (<span class="keywordtype">int</span> k, <span class="keyword">const</span> <span class="keywordtype">int</span> *hist);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"></span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment">/** Compute pairwise distances between sets of vectors</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * @param d dimension of the vectors</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * @param nq nb of query vectors</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * @param nb nb of database vectors</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * @param xq query vectors (size nq * d)</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * @param xb database vectros (size nb * d)</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * @param dis output distances (size nq * nb)</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * @param ldq,ldb, ldd strides for the matrices</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57">pairwise_L2sqr</a> (<span class="keywordtype">long</span> d,</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">long</span> nq, <span class="keyword">const</span> <span class="keywordtype">float</span> *xq,</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordtype">long</span> nb, <span class="keyword">const</span> <span class="keywordtype">float</span> *xb,</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">float</span> *dis,</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordtype">long</span> ldq = -1, <span class="keywordtype">long</span> ldb = -1, <span class="keywordtype">long</span> ldd = -1);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment">/* compute the inner product between nx vectors x and one y */</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="keywordtype">void</span> fvec_inner_products_ny (</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordtype">float</span> * ip, <span class="comment">/* output inner product */</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">/* compute ny square L2 distance bewteen x and a set of contiguous y vectors */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="keywordtype">void</span> fvec_L2sqr_ny (</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordtype">float</span> * __restrict dis,</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny);</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">/** squared norm of a vector */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">fvec_norm_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordtype">size_t</span> d);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"></span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment">/** compute the L2 norms for a set of vectors</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> * @param ip output norms, size nx</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> * @param x set of vectors, size nx * d</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="keywordtype">void</span> fvec_norms_L2 (<span class="keywordtype">float</span> * ip, <span class="keyword">const</span> <span class="keywordtype">float</span> * x, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx);</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"></span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment">/// same as fvec_norms_L2, but computes square norms</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"></span><span class="keywordtype">void</span> fvec_norms_L2sqr (<span class="keywordtype">float</span> * ip, <span class="keyword">const</span> <span class="keywordtype">float</span> * x, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx);</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> <span class="comment">/* L2-renormalize a set of vector. Nothing done if the vector is 0-normed */</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="keywordtype">void</span> fvec_renorm_L2 (<span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">float</span> * x);</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> <span class="comment">/* This function exists because the Torch counterpart is extremly slow</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> (not multi-threaded + unexpected overhead even in single thread).</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> It is here to implement the usual property |x-y|^2=|x|^2+|y|^2-2<x|y> */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="keywordtype">void</span> inner_product_to_L2sqr (<span class="keywordtype">float</span> * __restrict dis,</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * nr1,</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * nr2,</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordtype">size_t</span> n1, <span class="keywordtype">size_t</span> n2);</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment">/***************************************************************************</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> * Compute a subset of distances</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> ***************************************************************************/</span></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>  <span class="comment">/* compute the inner product between x and a subset y of ny vectors,</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> whose indices are given by idy. */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="keywordtype">void</span> fvec_inner_products_by_idx (</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordtype">float</span> * __restrict ip,</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keyword">const</span> <span class="keywordtype">long</span> * __restrict ids,</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny);</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="comment">/* same but for a subset in y indexed by idsy (ny vectors in total) */</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="keywordtype">void</span> fvec_L2sqr_by_idx (</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordtype">float</span> * __restrict dis,</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">const</span> <span class="keywordtype">long</span> * __restrict ids, <span class="comment">/* ids of y vecs */</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny);</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment">/***************************************************************************</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * KNN functions</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> ***************************************************************************/</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"></span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment">/** Return the k nearest neighors of each of the nx vectors x among the ny</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * vector y, w.r.t to max inner product</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> * @param x query vectors, size nx * d</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * @param y database vectors, size ny * d</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> * @param res result array, which also provides k. Sorted on output</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a880c7318971f866267a86945aaa61b17">knn_inner_product</a> (</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_minheap_array_t</a> * res);</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment"></span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment">/** Same as knn_inner_product, for the L2 distance */</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a2f803e3d3b07cfab63699c89de161237">knn_L2sqr</a> (</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <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="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_maxheap_array_t</a> * res);</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"></span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment">/** same as knn_L2sqr, but base_shift[bno] is subtracted to all</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * computed distances.</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> * @param base_shift size ny</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a5eb1701e46123827966f2a56da893d1d">knn_L2sqr_base_shift</a> (</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_maxheap_array_t</a> * res,</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *base_shift);</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment">/* Find the nearest neighbors for nx queries in a set of ny vectors</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> * indexed by ids. May be useful for re-ranking a pre-selected vector list</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="keywordtype">void</span> knn_inner_products_by_idx (</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">const</span> <span class="keywordtype">long</span> * ids,</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_minheap_array_t</a> * res);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="keywordtype">void</span> knn_L2sqr_by_idx (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keyword">const</span> <span class="keywordtype">long</span> * __restrict ids,</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <a class="code" href="structfaiss_1_1HeapArray.html">float_maxheap_array_t</a> * res);</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment">/***************************************************************************</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"> * Range search</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> ***************************************************************************/</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"></span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment">/// Forward declaration, see AuxIndexStructures.h</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="comment"></span><span class="keyword">struct </span><a class="code" href="structfaiss_1_1RangeSearchResult.html">RangeSearchResult</a>;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="comment"></span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment">/** Return the k nearest neighors of each of the nx vectors x among the ny</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment"> * vector y, w.r.t to max inner product</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment"> * @param x query vectors, size nx * d</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> * @param y database vectors, size ny * d</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> * @param radius search radius around the x vectors</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment"> * @param result result structure</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a1faa7bd079c9b1addf3058ddf882a000">range_search_L2sqr</a> (</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keywordtype">float</span> radius,</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <a class="code" href="structfaiss_1_1RangeSearchResult.html">RangeSearchResult</a> *result);</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"></span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="comment">/// same as range_search_L2sqr for the inner product similarity</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#ab29d725b808df6f142b80f21aa45e507">range_search_inner_product</a> (</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nx, <span class="keywordtype">size_t</span> ny,</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordtype">float</span> radius,</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <a class="code" href="structfaiss_1_1RangeSearchResult.html">RangeSearchResult</a> *result);</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</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> </div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="comment">/***************************************************************************</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment"> * Misc matrix and vector manipulation functions</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment"> ***************************************************************************/</span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"></span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment">/** compute c := a + bf * b for a, b and c tables</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment"> * @param n size of the tables</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="comment"> * @param a size n</span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="comment"> * @param b size n</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"> * @param c restult table, size n</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847">fvec_madd</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c);</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> </div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"></span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment">/** same as fvec_madd, also return index of the min of the result table</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> * @return index of the min of table c</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="keywordtype">int</span> <a class="code" href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a">fvec_madd_and_argmin</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c);</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> </div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment">/* perform a reflection (not an efficient implementation, just for test ) */</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="keywordtype">void</span> reflection (<span class="keyword">const</span> <span class="keywordtype">float</span> * u, <span class="keywordtype">float</span> * x, <span class="keywordtype">size_t</span> n, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nu);</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> <span class="comment"></span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment">/** For k-means: update stage. Returns nb of split clusters. */</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> <span class="keywordtype">int</span> <a class="code" href="namespacefaiss.html#ad1cfbe51f2d77dc5094e0140f5955165">km_update_centroids</a> (</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordtype">float</span> * centroids,</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordtype">long</span> * assign,</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> k, <span class="keywordtype">size_t</span> n);</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="comment"></span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="comment">/** compute the Q of the QR decomposition for m > n</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> * @param a size n * m: input matrix and output Q</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#afb68fe89ad5e948974da1b70d7b4157c">matrix_qr</a> (<span class="keywordtype">int</span> m, <span class="keywordtype">int</span> n, <span class="keywordtype">float</span> *a);</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="comment"></span></div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment">/** distances are supposed to be sorted. Sorts indices with same distance*/</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#ae0ee1b6fbd3d6da0f1a3550a780ca24c">ranklist_handle_ties</a> (<span class="keywordtype">int</span> k, <span class="keywordtype">long</span> *idx, <span class="keyword">const</span> <span class="keywordtype">float</span> *dis);</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment"></span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment">/** count the number of comon elements between v1 and v2</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment"> * algorithm = sorting + bissection to avoid double-counting duplicates</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="keywordtype">size_t</span> <a class="code" href="namespacefaiss.html#a8dbc652ba48d41f126b8815004899448">ranklist_intersection_size</a> (<span class="keywordtype">size_t</span> k1, <span class="keyword">const</span> <span class="keywordtype">long</span> *v1,</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keywordtype">size_t</span> k2, <span class="keyword">const</span> <span class="keywordtype">long</span> *v2);</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"></span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment">/** merge a result table into another one</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> * @param I0, D0 first result table, size (n, k)</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"> * @param I1, D1 second result table, size (n, k)</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="comment"> * @param keep_min if true, keep min values, otherwise keep max</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment"> * @param translation add this value to all I1's indexes</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment"> * @return nb of values that were taken from the second table</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="keywordtype">size_t</span> <a class="code" href="namespacefaiss.html#afb7b33f6892678ba79aaf5e71777837c">merge_result_table_with</a> (<span class="keywordtype">size_t</span> n, <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordtype">long</span> *I0, <span class="keywordtype">float</span> *D0,</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keyword">const</span> <span class="keywordtype">long</span> *I1, <span class="keyword">const</span> <span class="keywordtype">float</span> *D1,</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="keywordtype">bool</span> keep_min = <span class="keyword">true</span>,</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="keywordtype">long</span> translation = 0);</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> </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> </div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="keywordtype">void</span> fvec_argsort (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *vals,</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="keywordtype">size_t</span> *perm);</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> </div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="keywordtype">void</span> fvec_argsort_parallel (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *vals,</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordtype">size_t</span> *perm);</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> <span class="comment"></span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="comment">/// compute histogram on v</span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="comment"></span><span class="keywordtype">int</span> <a class="code" href="namespacefaiss.html#a7bea462108bee98d8d5859b51ec4db8e">ivec_hist</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">int</span> * v, <span class="keywordtype">int</span> vmax, <span class="keywordtype">int</span> *hist);</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="comment"></span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="comment">/** Compute histogram of bits on a code array</span></div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="comment"> * @param codes size(n, nbits / 8)</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> <span class="comment"> * @param hist size(nbits): nb of 1s in the array of codes</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a154a47857ed321b9db91122770a16e09">bincode_hist</a>(<span class="keywordtype">size_t</span> n, <span class="keywordtype">size_t</span> nbits, <span class="keyword">const</span> uint8_t *codes, <span class="keywordtype">int</span> *hist);</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> </div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <span class="comment"></span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> <span class="comment">/// compute a checksum on a table.</span></div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="comment"></span><span class="keywordtype">size_t</span> <a class="code" href="namespacefaiss.html#a4369329c9dbdfe23e3f35d09ba7b5c6e">ivec_checksum</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">int</span> *a);</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> <span class="comment"></span></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> <span class="comment">/** random subsamples a set of vectors if there are too many of them</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span> <span class="comment"> * @param d dimension of the vectors</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> <span class="comment"> * @param n on input: nb of input vectors, output: nb of output vectors</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span> <span class="comment"> * @param nmax max nb of vectors to keep</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="comment"> * @param x input array, size *n-by-d</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> <span class="comment"> * @param seed random seed to use for sampling</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="comment"> * @return x or an array allocated with new [] with *n vectors</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="keyword">const</span> <span class="keywordtype">float</span> *<a class="code" href="namespacefaiss.html#a14884d253128c7af5891a65082ad7dc6">fvecs_maybe_subsample</a> (</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> *n, <span class="keywordtype">size_t</span> nmax, <span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keywordtype">bool</span> verbose = <span class="keyword">false</span>, <span class="keywordtype">long</span> seed = 1234);</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> </div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> } <span class="comment">// namspace faiss</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> <span class="preprocessor">#endif </span><span class="comment">/* FAISS_utils_h */</span><span class="preprocessor"></span></div>
<div class="ttc" id="structfaiss_1_1RandomGenerator_html"><div class="ttname"><a href="structfaiss_1_1RandomGenerator.html">faiss::RandomGenerator</a></div><div class="ttdoc">random generator that can be used in multithreaded contexts </div><div class="ttdef"><b>Definition:</b> <a href="utils_8h_source.html#l00048">utils.h:48</a></div></div>
<div class="ttc" id="namespacefaiss_html_a5eb1701e46123827966f2a56da893d1d"><div class="ttname"><a href="namespacefaiss.html#a5eb1701e46123827966f2a56da893d1d">faiss::knn_L2sqr_base_shift</a></div><div class="ttdeci">void knn_L2sqr_base_shift(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_maxheap_array_t *res, const float *base_shift)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00955">utils.cpp:955</a></div></div>
<div class="ttc" id="structfaiss_1_1RandomGenerator_html_a7633c373153f3b2824d2d99382ba20ab"><div class="ttname"><a href="structfaiss_1_1RandomGenerator.html#a7633c373153f3b2824d2d99382ba20ab">faiss::RandomGenerator::RandomGenerator</a></div><div class="ttdeci">RandomGenerator(long seed=1234)</div><div class="ttdoc">initialize </div></div>
<div class="ttc" id="namespacefaiss_html_ad1cfbe51f2d77dc5094e0140f5955165"><div class="ttname"><a href="namespacefaiss.html#ad1cfbe51f2d77dc5094e0140f5955165">faiss::km_update_centroids</a></div><div class="ttdeci">int km_update_centroids(const float *x, float *centroids, long *assign, size_t d, size_t k, size_t n)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01369">utils.cpp:1369</a></div></div>
<div class="ttc" id="namespacefaiss_html_a7466bd32de31640860393a701eaac5ad"><div class="ttname"><a href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">faiss::fvec_L2sqr</a></div><div class="ttdeci">float fvec_L2sqr(const float *x, const float *y, size_t d)</div><div class="ttdoc">Squared L2 distance between two vectors. </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00481">utils.cpp:481</a></div></div>
<div class="ttc" id="namespacefaiss_html_a154a47857ed321b9db91122770a16e09"><div class="ttname"><a href="namespacefaiss.html#a154a47857ed321b9db91122770a16e09">faiss::bincode_hist</a></div><div class="ttdeci">void bincode_hist(size_t n, size_t nbits, const uint8_t *codes, int *hist)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01615">utils.cpp:1615</a></div></div>
<div class="ttc" id="namespacefaiss_html_a14884d253128c7af5891a65082ad7dc6"><div class="ttname"><a href="namespacefaiss.html#a14884d253128c7af5891a65082ad7dc6">faiss::fvecs_maybe_subsample</a></div><div class="ttdeci">const float * fvecs_maybe_subsample(size_t d, size_t *n, size_t nmax, const float *x, bool verbose, long seed)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01941">utils.cpp:1941</a></div></div>
<div class="ttc" id="namespacefaiss_html_ae0ee1b6fbd3d6da0f1a3550a780ca24c"><div class="ttname"><a href="namespacefaiss.html#ae0ee1b6fbd3d6da0f1a3550a780ca24c">faiss::ranklist_handle_ties</a></div><div class="ttdeci">void ranklist_handle_ties(int k, long *idx, const float *dis)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01461">utils.cpp:1461</a></div></div>
<div class="ttc" id="structfaiss_1_1RandomGenerator_html_ac82a433d7bfa56d750907ba5cf74aed7"><div class="ttname"><a href="structfaiss_1_1RandomGenerator.html#ac82a433d7bfa56d750907ba5cf74aed7">faiss::RandomGenerator::rand_float</a></div><div class="ttdeci">float rand_float()</div><div class="ttdoc">between 0 and 1 </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00207">utils.cpp:207</a></div></div>
<div class="ttc" id="namespacefaiss_html_a40328c31abd0bbba5bd95d7de951e847"><div class="ttname"><a href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847">faiss::fvec_madd</a></div><div class="ttdeci">void fvec_madd(size_t n, const float *a, float bf, const float *b, float *c)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01855">utils.cpp:1855</a></div></div>
<div class="ttc" id="namespacefaiss_html_aa3af5769b0b649f112332a874c64d361"><div class="ttname"><a href="namespacefaiss.html#aa3af5769b0b649f112332a874c64d361">faiss::get_mem_usage_kb</a></div><div class="ttdeci">size_t get_mem_usage_kb()</div><div class="ttdoc">get current RSS usage in kB </div></div>
<div class="ttc" id="namespacefaiss_html_a7bea462108bee98d8d5859b51ec4db8e"><div class="ttname"><a href="namespacefaiss.html#a7bea462108bee98d8d5859b51ec4db8e">faiss::ivec_hist</a></div><div class="ttdeci">int ivec_hist(size_t n, const int *v, int vmax, int *hist)</div><div class="ttdoc">compute histogram on v </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01604">utils.cpp:1604</a></div></div>
<div class="ttc" id="structfaiss_1_1RandomGenerator_html_acbceaa8b017793ca4f8d90e644b0d7f4"><div class="ttname"><a href="structfaiss_1_1RandomGenerator.html#acbceaa8b017793ca4f8d90e644b0d7f4">faiss::RandomGenerator::rand_long</a></div><div class="ttdeci">long rand_long()</div><div class="ttdoc">random long &lt; 2 ^ 62 </div></div>
<div class="ttc" id="namespacefaiss_html_afb7b33f6892678ba79aaf5e71777837c"><div class="ttname"><a href="namespacefaiss.html#afb7b33f6892678ba79aaf5e71777837c">faiss::merge_result_table_with</a></div><div class="ttdeci">size_t merge_result_table_with(size_t n, size_t k, long *I0, float *D0, const long *I1, const float *D1, bool keep_min, long translation)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01477">utils.cpp:1477</a></div></div>
<div class="ttc" id="structfaiss_1_1RandomGenerator_html_a583f124ecacdbe037ac96e23a44dd420"><div class="ttname"><a href="structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420">faiss::RandomGenerator::rand_int</a></div><div class="ttdeci">int rand_int()</div><div class="ttdoc">random 31-bit positive integer </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="namespacefaiss_html_a8dbc652ba48d41f126b8815004899448"><div class="ttname"><a href="namespacefaiss.html#a8dbc652ba48d41f126b8815004899448">faiss::ranklist_intersection_size</a></div><div class="ttdeci">size_t ranklist_intersection_size(size_t k1, const long *v1, size_t k2, const long *v2_in)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01542">utils.cpp:1542</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#l01311">utils.cpp:1311</a></div></div>
<div class="ttc" id="namespacefaiss_html_ab29d725b808df6f142b80f21aa45e507"><div class="ttname"><a href="namespacefaiss.html#ab29d725b808df6f142b80f21aa45e507">faiss::range_search_inner_product</a></div><div class="ttdeci">void range_search_inner_product(const float *x, const float *y, size_t d, size_t nx, size_t ny, float radius, RangeSearchResult *res)</div><div class="ttdoc">same as range_search_L2sqr for the inner product similarity </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01249">utils.cpp:1249</a></div></div>
<div class="ttc" id="namespacefaiss_html_a880c7318971f866267a86945aaa61b17"><div class="ttname"><a href="namespacefaiss.html#a880c7318971f866267a86945aaa61b17">faiss::knn_inner_product</a></div><div class="ttdeci">void knn_inner_product(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_minheap_array_t *res)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00915">utils.cpp:915</a></div></div>
<div class="ttc" id="namespacefaiss_html_af2a71f7d5402ae02ce169a4cc83020eb"><div class="ttname"><a href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">faiss::getmillisecs</a></div><div class="ttdeci">double getmillisecs()</div><div class="ttdoc">ms elapsed since some arbitrary epoch </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00070">utils.cpp:70</a></div></div>
<div class="ttc" id="namespacefaiss_html_a94c1d99ac39d22e362aa27ce7c7ff714"><div class="ttname"><a href="namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714">faiss::imbalance_factor</a></div><div class="ttdeci">double imbalance_factor(int k, const int *hist)</div><div class="ttdoc">same, takes a histogram as input </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01580">utils.cpp:1580</a></div></div>
<div class="ttc" id="namespacefaiss_html_a7a49180ebf10e643217bbce5862c7f84"><div class="ttname"><a href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">faiss::fvec_norm_L2sqr</a></div><div class="ttdeci">float fvec_norm_L2sqr(const float *x, size_t d)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00538">utils.cpp:538</a></div></div>
<div class="ttc" id="namespacefaiss_html_a1faa7bd079c9b1addf3058ddf882a000"><div class="ttname"><a href="namespacefaiss.html#a1faa7bd079c9b1addf3058ddf882a000">faiss::range_search_L2sqr</a></div><div class="ttdeci">void range_search_L2sqr(const float *x, const float *y, size_t d, size_t nx, size_t ny, float radius, RangeSearchResult *res)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01234">utils.cpp:1234</a></div></div>
<div class="ttc" id="namespacefaiss_html_afb68fe89ad5e948974da1b70d7b4157c"><div class="ttname"><a href="namespacefaiss.html#afb68fe89ad5e948974da1b70d7b4157c">faiss::matrix_qr</a></div><div class="ttdeci">void matrix_qr(int m, int n, float *a)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01289">utils.cpp:1289</a></div></div>
<div class="ttc" id="structfaiss_1_1RangeSearchResult_html"><div class="ttname"><a href="structfaiss_1_1RangeSearchResult.html">faiss::RangeSearchResult</a></div><div class="ttdef"><b>Definition:</b> <a href="AuxIndexStructures_8h_source.html#l00029">AuxIndexStructures.h:29</a></div></div>
<div class="ttc" id="namespacefaiss_html_a4369329c9dbdfe23e3f35d09ba7b5c6e"><div class="ttname"><a href="namespacefaiss.html#a4369329c9dbdfe23e3f35d09ba7b5c6e">faiss::ivec_checksum</a></div><div class="ttdeci">size_t ivec_checksum(size_t n, const int *a)</div><div class="ttdoc">compute a checksum on a table. </div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01638">utils.cpp:1638</a></div></div>
<div class="ttc" id="namespacefaiss_html_a9da63b8bb84460f5e8ccf8e17622cc7a"><div class="ttname"><a href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a">faiss::fvec_madd_and_argmin</a></div><div class="ttdeci">int fvec_madd_and_argmin(size_t n, const float *a, float bf, const float *b, float *c)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l01929">utils.cpp:1929</a></div></div>
<div class="ttc" id="namespacefaiss_html_a2f803e3d3b07cfab63699c89de161237"><div class="ttname"><a href="namespacefaiss.html#a2f803e3d3b07cfab63699c89de161237">faiss::knn_L2sqr</a></div><div class="ttdeci">void knn_L2sqr(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_maxheap_array_t *res)</div><div class="ttdef"><b>Definition:</b> <a href="utils_8cpp_source.html#l00935">utils.cpp:935</a></div></div>
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