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<div class="title">/data/users/matthijs/github_faiss/faiss/Clustering.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">/**</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This source code is licensed under the CC-by-NC license found in the</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</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> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/* Copyright 2004-present Facebook. All Rights Reserved.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> kmeans clustering routines</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "Clustering.h"</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> </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">#include <cmath></span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <cstdio></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <cstring></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 "utils.h"</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "FaissAssert.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> </div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="structfaiss_1_1ClusteringParameters.html#a86c8802261041f5d49b1a0d296da60be"> 28</a></span> <a class="code" href="structfaiss_1_1ClusteringParameters.html#a86c8802261041f5d49b1a0d296da60be">ClusteringParameters::ClusteringParameters</a> ():</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  niter(25),</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  nredo(1),</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  verbose(false), spherical(false),</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  update_index(false),</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  min_points_per_centroid(39),</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  max_points_per_centroid(256),</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  seed(1234)</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> <span class="comment">// 39 corresponds to 10000 / 256 -> to avoid warnings on PQ tests with randu10k</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"><a class="line" href="structfaiss_1_1Clustering.html#a2fa90a2681dc42faaf2435e63a5ae9b4"> 40</a></span> <a class="code" href="structfaiss_1_1Clustering.html#a2fa90a2681dc42faaf2435e63a5ae9b4">Clustering::Clustering</a> (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> k):</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  d(d), k(k) {}</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> <a class="code" href="structfaiss_1_1Clustering.html#a2fa90a2681dc42faaf2435e63a5ae9b4">Clustering::Clustering</a> (<span class="keywordtype">int</span> d, <span class="keywordtype">int</span> k, <span class="keyword">const</span> <a class="code" href="structfaiss_1_1ClusteringParameters.html">ClusteringParameters</a> &cp):</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <a class="code" href="structfaiss_1_1ClusteringParameters.html">ClusteringParameters</a> (cp), d(d), k(k) {}</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">static</span> <span class="keywordtype">double</span> imbalance_factor (<span class="keywordtype">int</span> n, <span class="keywordtype">int</span> k, <span class="keywordtype">long</span> *assign) {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  std::vector<int> hist(k, 0);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++)</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  hist[assign[i]]++;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">double</span> tot = 0, uf = 0;</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0 ; i < k ; i++) {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  tot += hist[i];</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  uf += hist[i] * (double) hist[i];</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  uf = uf * k / (tot * tot);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> uf;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="structfaiss_1_1Clustering.html#a839f210abb11c7a1c7162e336e0ff9cf"> 67</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1Clustering.html#a839f210abb11c7a1c7162e336e0ff9cf">Clustering::train</a> (idx_t nx, <span class="keyword">const</span> <span class="keywordtype">float</span> *x_in, <a class="code" href="structfaiss_1_1Index.html">Index</a> & index) {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  FAISS_ASSERT (nx >= k ||</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  !<span class="stringliteral">"need at least as many training points as clusters"</span>);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordtype">double</span> t0 = <a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>();</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// yes it is the user's responsibility, but it may spare us some</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// hard-to-debug reports.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nx * <a class="code" href="structfaiss_1_1Clustering.html#afbf6efacae54c58586b75ed790facd74">d</a>; i++) {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  FAISS_ASSERT (finite (x_in[i]) ||</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  !<span class="stringliteral">"input contains NaN's or Inf's"</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="keyword">const</span> <span class="keywordtype">float</span> *x = x_in;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (nx > k * <a class="code" href="structfaiss_1_1ClusteringParameters.html#a993e0a035248faad6e292a5ef9af1953">max_points_per_centroid</a>) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (verbose)</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  printf(<span class="stringliteral">"Sampling a subset of %ld / %ld for training\n"</span>,</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  k * max_points_per_centroid, nx);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">int</span> *perm = <span class="keyword">new</span> <span class="keywordtype">int</span>[nx];</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  rand_perm (perm, nx, <a class="code" href="structfaiss_1_1ClusteringParameters.html#a509c65e2ebe6ecabebd163ecb03c5579">seed</a>);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  nx = k * <a class="code" href="structfaiss_1_1ClusteringParameters.html#a993e0a035248faad6e292a5ef9af1953">max_points_per_centroid</a>;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">float</span> * x_new = <span class="keyword">new</span> <span class="keywordtype">float</span> [nx * <a class="code" href="structfaiss_1_1Clustering.html#afbf6efacae54c58586b75ed790facd74">d</a>];</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">for</span> (idx_t i = 0; i < nx; i++)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  memcpy (x_new + i * d, x + perm[i] * d, <span class="keyword">sizeof</span>(x_new[0]) * d);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">delete</span> [] perm;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  x = x_new;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (nx < k * <a class="code" href="structfaiss_1_1ClusteringParameters.html#a5af907901147a9b1e748b13305839924">min_points_per_centroid</a>) {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  fprintf (stderr,</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="stringliteral">"WARNING clustering %ld points to %ld centroids: "</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="stringliteral">"please provide at least %ld training points\n"</span>,</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  nx, k, idx_t(k) * min_points_per_centroid);</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>  <span class="keywordflow">if</span> (verbose)</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  printf(<span class="stringliteral">"Clustering %d points in %ldD to %ld clusters, "</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="stringliteral">"redo %d times, %d iterations\n"</span>,</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">int</span>(nx), d, k, <a class="code" href="structfaiss_1_1ClusteringParameters.html#a11a049c40c376c57ac6cc3b8d5d1d58b">nredo</a>, <a class="code" href="structfaiss_1_1ClusteringParameters.html#a5c7c6f05c75e1668befdb3be148fd5f9">niter</a>);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </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>  idx_t * assign = <span class="keyword">new</span> idx_t[nx];</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordtype">float</span> * dis = <span class="keyword">new</span> <span class="keywordtype">float</span>[nx];</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">float</span> best_err = 1e50;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordtype">double</span> t_search_tot = 0;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (verbose) {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  printf(<span class="stringliteral">" Preprocessing in %5g s\n"</span>,</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  (<a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>() - t0)/1000.);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  t0 = <a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>();</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> redo = 0; redo < <a class="code" href="structfaiss_1_1ClusteringParameters.html#a11a049c40c376c57ac6cc3b8d5d1d58b">nredo</a>; redo++) {</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>  std::vector<float> buf_centroids;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  std::vector<float> &cur_centroids =</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  nredo == 1 ? <a class="code" href="structfaiss_1_1Clustering.html#a64c5ec0b4a7967d8be2872974b455ff1">centroids</a> : buf_centroids;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> (verbose && nredo > 1) {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  printf(<span class="stringliteral">"Outer iteration %d / %d\n"</span>, redo, nredo);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (cur_centroids.size() == 0) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// initialize centroids with random points from the dataset</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  cur_centroids.resize (d * k);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordtype">int</span> *perm = <span class="keyword">new</span> <span class="keywordtype">int</span>[nx];</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  rand_perm (perm, nx, <a class="code" href="structfaiss_1_1ClusteringParameters.html#a509c65e2ebe6ecabebd163ecb03c5579">seed</a> + 1 + redo * 15486557L);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="preprocessor">#pragma omp parallel for</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="structfaiss_1_1Clustering.html#a87581785d9516c683bbc7c9392bfa993">k</a> ; i++)</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  memcpy (&cur_centroids[i * d], x + perm[i] * d,</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  d * <span class="keyword">sizeof</span> (<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keyword">delete</span> [] perm;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  } <span class="keywordflow">else</span> { <span class="comment">// assume user provides some meaningful initialization</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  FAISS_ASSERT (cur_centroids.size() == d * <a class="code" href="structfaiss_1_1Clustering.html#a87581785d9516c683bbc7c9392bfa993">k</a>);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  FAISS_ASSERT (nredo == 1 ||</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  !<span class="stringliteral">"will redo with same initialization"</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="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ClusteringParameters.html#ad997fb511f574f7ddc69938c21612f8d">spherical</a>)</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  fvec_renorm_L2 (d, k, cur_centroids.data());</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span> (!index.<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>)</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  index.<a class="code" href="structfaiss_1_1Index.html#a8f67dfd73993e192dc78f2c93d9d9532">train</a> (k, cur_centroids.data());</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>  FAISS_ASSERT (index.<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> == 0 );</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  index.<a class="code" href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">add</a> (k, cur_centroids.data());</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordtype">float</span> err = 0;</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="structfaiss_1_1ClusteringParameters.html#a5c7c6f05c75e1668befdb3be148fd5f9">niter</a>; i++) {</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordtype">double</span> t0s = <a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>();</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  index.<a class="code" href="structfaiss_1_1Index.html#aced51b1ebc33c47ab3ae15ea906559a7">search</a> (nx, x, 1, dis, assign);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  t_search_tot += <a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>() - t0s;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  err = 0;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < nx; j++)</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  err += dis[j];</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <a class="code" href="structfaiss_1_1Clustering.html#a91e32da946477bb751706a68c5cd3327">obj</a>.push_back (err);</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="keywordtype">int</span> nsplit = <a class="code" href="namespacefaiss.html#ad1cfbe51f2d77dc5094e0140f5955165">km_update_centroids</a> (x, cur_centroids.data(),</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  assign, <a class="code" href="structfaiss_1_1Clustering.html#afbf6efacae54c58586b75ed790facd74">d</a>, <a class="code" href="structfaiss_1_1Clustering.html#a87581785d9516c683bbc7c9392bfa993">k</a>, nx);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">if</span> (verbose) {</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  printf (<span class="stringliteral">" Iteration %d (%.2f s, search %.2f s): "</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="stringliteral">"objective=%g imbalance=%.3f nsplit=%d \r"</span>,</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  i, (<a class="code" href="namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb">getmillisecs</a>() - t0) / 1000.0,</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  t_search_tot / 1000,</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  err, imbalance_factor (nx, k, assign),</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  nsplit);</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  fflush (stdout);</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>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ClusteringParameters.html#ad997fb511f574f7ddc69938c21612f8d">spherical</a>)</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  fvec_renorm_L2 (d, k, cur_centroids.data());</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>  index.<a class="code" href="structfaiss_1_1Index.html#a849361f5f0ab0aba8d419c86f2594191">reset</a> ();</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> (<a class="code" href="structfaiss_1_1ClusteringParameters.html#a27d6192097920fa981cff0acedfaac91">update_index</a>)</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  index.<a class="code" href="structfaiss_1_1Index.html#a8f67dfd73993e192dc78f2c93d9d9532">train</a> (k, cur_centroids.data());</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>  assert (index.<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> == 0);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  index.<a class="code" href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">add</a> (k, <a class="code" href="structfaiss_1_1Clustering.html#a64c5ec0b4a7967d8be2872974b455ff1">centroids</a>.data());</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (verbose) printf(<span class="stringliteral">"\n"</span>);</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (nredo > 1) {</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">if</span> (err < best_err) {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">if</span> (verbose)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  printf (<span class="stringliteral">"Keep new clusters\n"</span>);</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="structfaiss_1_1Clustering.html#a64c5ec0b4a7967d8be2872974b455ff1">centroids</a> = cur_centroids;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  best_err = err;</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>  }</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> </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keyword">delete</span> [] assign;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keyword">delete</span> [] dis;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">if</span> (x_in != x) <span class="keyword">delete</span> [] x;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> }</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> </div>
<div class="line"><a name="l00204"></a><span class="lineno"><a class="line" href="namespacefaiss.html#a38bd0dde8a1b229201a5fcb64d05daa6"> 204</a></span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a38bd0dde8a1b229201a5fcb64d05daa6">kmeans_clustering</a> (<span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> n, <span class="keywordtype">size_t</span> k,</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordtype">float</span> *centroids)</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> {</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <a class="code" href="structfaiss_1_1Clustering.html">Clustering</a> clus (d, k);</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  clus.verbose = d * n * k > (1L << 30);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">// display logs if > 1Gflop per iteration</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a> index (d);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  clus.<a class="code" href="structfaiss_1_1Clustering.html#a839f210abb11c7a1c7162e336e0ff9cf">train</a> (n, x, index);</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  memcpy(centroids, clus.<a class="code" href="structfaiss_1_1Clustering.html#a64c5ec0b4a7967d8be2872974b455ff1">centroids</a>.data(), <span class="keyword">sizeof</span>(*centroids) * d * k);</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">return</span> clus.<a class="code" href="structfaiss_1_1Clustering.html#a91e32da946477bb751706a68c5cd3327">obj</a>.back();</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> }</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> } <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a5c7c6f05c75e1668befdb3be148fd5f9"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a5c7c6f05c75e1668befdb3be148fd5f9">faiss::ClusteringParameters::niter</a></div><div class="ttdeci">int niter</div><div class="ttdoc">clustering iterations </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00026">Clustering.h:26</a></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#l01286">utils.cpp:1286</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a11a049c40c376c57ac6cc3b8d5d1d58b"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a11a049c40c376c57ac6cc3b8d5d1d58b">faiss::ClusteringParameters::nredo</a></div><div class="ttdeci">int nredo</div><div class="ttdoc">redo clustering this many times and keep best </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00027">Clustering.h:27</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a86c8802261041f5d49b1a0d296da60be"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a86c8802261041f5d49b1a0d296da60be">faiss::ClusteringParameters::ClusteringParameters</a></div><div class="ttdeci">ClusteringParameters()</div><div class="ttdoc">sets reasonable defaults </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8cpp_source.html#l00028">Clustering.cpp:28</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a849361f5f0ab0aba8d419c86f2594191"><div class="ttname"><a href="structfaiss_1_1Index.html#a849361f5f0ab0aba8d419c86f2594191">faiss::Index::reset</a></div><div class="ttdeci">virtual void reset()=0</div><div class="ttdoc">removes all elements from the database. </div></div>
<div class="ttc" id="structfaiss_1_1IndexFlatL2_html"><div class="ttname"><a href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00081">IndexFlat.h:81</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_a2fa90a2681dc42faaf2435e63a5ae9b4"><div class="ttname"><a href="structfaiss_1_1Clustering.html#a2fa90a2681dc42faaf2435e63a5ae9b4">faiss::Clustering::Clustering</a></div><div class="ttdeci">Clustering(int d, int k)</div><div class="ttdoc">the only mandatory parameters are k and d </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8cpp_source.html#l00040">Clustering.cpp:40</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_a87581785d9516c683bbc7c9392bfa993"><div class="ttname"><a href="structfaiss_1_1Clustering.html#a87581785d9516c683bbc7c9392bfa993">faiss::Clustering::k</a></div><div class="ttdeci">size_t k</div><div class="ttdoc">nb of centroids </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00061">Clustering.h:61</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a509c65e2ebe6ecabebd163ecb03c5579"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a509c65e2ebe6ecabebd163ecb03c5579">faiss::ClusteringParameters::seed</a></div><div class="ttdeci">int seed</div><div class="ttdoc">seed for the random number generator </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00037">Clustering.h:37</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a5af907901147a9b1e748b13305839924"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a5af907901147a9b1e748b13305839924">faiss::ClusteringParameters::min_points_per_centroid</a></div><div class="ttdeci">int min_points_per_centroid</div><div class="ttdoc">otherwise you get a warning </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00034">Clustering.h:34</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html"><div class="ttname"><a href="structfaiss_1_1Clustering.html">faiss::Clustering</a></div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00058">Clustering.h:58</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a1b5e9ac70adbce0897dd6c8276ad96f2"><div class="ttname"><a href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">faiss::Index::add</a></div><div class="ttdeci">virtual void add(idx_t n, const float *x)=0</div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_a91e32da946477bb751706a68c5cd3327"><div class="ttname"><a href="structfaiss_1_1Clustering.html#a91e32da946477bb751706a68c5cd3327">faiss::Clustering::obj</a></div><div class="ttdeci">std::vector< float > obj</div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00068">Clustering.h:68</a></div></div>
<div class="ttc" id="namespacefaiss_html_a38bd0dde8a1b229201a5fcb64d05daa6"><div class="ttname"><a href="namespacefaiss.html#a38bd0dde8a1b229201a5fcb64d05daa6">faiss::kmeans_clustering</a></div><div class="ttdeci">float kmeans_clustering(size_t d, size_t n, size_t k, const float *x, float *centroids)</div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8cpp_source.html#l00204">Clustering.cpp:204</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a6970683faa021b7a6f1a0865c0d4eccd"><div class="ttname"><a href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">faiss::Index::ntotal</a></div><div class="ttdeci">idx_t ntotal</div><div class="ttdoc">total nb of indexed vectors </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00067">Index.h:67</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#l00071">utils.cpp:71</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_a64c5ec0b4a7967d8be2872974b455ff1"><div class="ttname"><a href="structfaiss_1_1Clustering.html#a64c5ec0b4a7967d8be2872974b455ff1">faiss::Clustering::centroids</a></div><div class="ttdeci">std::vector< float > centroids</div><div class="ttdoc">centroids (k * d) </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00064">Clustering.h:64</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_afbf6efacae54c58586b75ed790facd74"><div class="ttname"><a href="structfaiss_1_1Clustering.html#afbf6efacae54c58586b75ed790facd74">faiss::Clustering::d</a></div><div class="ttdeci">size_t d</div><div class="ttdoc">dimension of the vectors </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00060">Clustering.h:60</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_aced51b1ebc33c47ab3ae15ea906559a7"><div class="ttname"><a href="structfaiss_1_1Index.html#aced51b1ebc33c47ab3ae15ea906559a7">faiss::Index::search</a></div><div class="ttdeci">virtual void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const =0</div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a27d6192097920fa981cff0acedfaac91"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a27d6192097920fa981cff0acedfaac91">faiss::ClusteringParameters::update_index</a></div><div class="ttdeci">bool update_index</div><div class="ttdoc">update index after each iteration? </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00032">Clustering.h:32</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html">faiss::ClusteringParameters</a></div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00025">Clustering.h:25</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html"><div class="ttname"><a href="structfaiss_1_1Index.html">faiss::Index</a></div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00061">Index.h:61</a></div></div>
<div class="ttc" id="structfaiss_1_1Clustering_html_a839f210abb11c7a1c7162e336e0ff9cf"><div class="ttname"><a href="structfaiss_1_1Clustering.html#a839f210abb11c7a1c7162e336e0ff9cf">faiss::Clustering::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x, faiss::Index &index)</div><div class="ttdoc">Index is used during the assignment stage. </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8cpp_source.html#l00067">Clustering.cpp:67</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a6e92732617c4dbe364e7678dd8773a7f"><div class="ttname"><a href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">faiss::Index::is_trained</a></div><div class="ttdeci">bool is_trained</div><div class="ttdoc">set if the Index does not require training, or if training is done already </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00071">Index.h:71</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a8f67dfd73993e192dc78f2c93d9d9532"><div class="ttname"><a href="structfaiss_1_1Index.html#a8f67dfd73993e192dc78f2c93d9d9532">faiss::Index::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x)</div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00092">Index.h:92</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_ad997fb511f574f7ddc69938c21612f8d"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#ad997fb511f574f7ddc69938c21612f8d">faiss::ClusteringParameters::spherical</a></div><div class="ttdeci">bool spherical</div><div class="ttdoc">do we want normalized centroids? </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00031">Clustering.h:31</a></div></div>
<div class="ttc" id="structfaiss_1_1ClusteringParameters_html_a993e0a035248faad6e292a5ef9af1953"><div class="ttname"><a href="structfaiss_1_1ClusteringParameters.html#a993e0a035248faad6e292a5ef9af1953">faiss::ClusteringParameters::max_points_per_centroid</a></div><div class="ttdeci">int max_points_per_centroid</div><div class="ttdoc">to limit size of dataset </div><div class="ttdef"><b>Definition:</b> <a href="Clustering_8h_source.html#l00035">Clustering.h:35</a></div></div>
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