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  • matthijs's avatar
    sync with FB version 2017-11-22 · 0df3f646
    matthijs authored 
    various bugfixes from github issues
kmean with some frozen centroids
GPU better tiling for large flat datasets
default AVX for vector ops
    0df3f646
IndexProxy_8cpp_source.html 43.8 KB
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<div class="title">IndexProxy.cpp</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<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>&#160;<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>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// Copyright 2004-present Facebook. All Rights Reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &quot;IndexProxy.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;../FaissAssert.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &quot;../Clustering.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &quot;GpuIndexFlat.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &quot;StandardGpuResources.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;cstring&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;IndexProxy::IndexProxy():own_fields(false) {</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;}</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;IndexProxy::~IndexProxy() {</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    <span class="keywordflow">if</span> (own_fields) {</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; index : indices_)</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;           <span class="keyword">delete</span> index.first;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    }</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;}</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#af9bb81e75f8d5471094e4d4776a56f63">   32</a></span>&#160;<a class="code" href="classfaiss_1_1gpu_1_1IndexProxy.html#af9bb81e75f8d5471094e4d4776a56f63">IndexProxy::addIndex</a>(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>* index) {</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;  <span class="comment">// Make sure that the parameters are the same for all prior indices</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;  <span class="keywordflow">if</span> (!indices_.empty()) {</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="keyword">auto</span>&amp; existing = indices_.front().first;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="keywordflow">if</span> (index-&gt;<a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a> != existing-&gt;d) {</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;      FAISS_ASSERT(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;      <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    }</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="keywordflow">if</span> (index-&gt;<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> != existing-&gt;ntotal) {</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;      FAISS_ASSERT(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;      <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keywordflow">if</span> (index-&gt;<a class="code" href="structfaiss_1_1Index.html#a8e18f641854b2bde83ecff0a2f9a6f4e">metric_type</a> != existing-&gt;metric_type) {</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;      FAISS_ASSERT(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;      <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    }</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;} <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    <span class="comment">// Set our parameters</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    <span class="comment">// FIXME: this is a little bit weird</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    this-&gt;<a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a> = index-&gt;<a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    this-&gt;<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> = index-&gt;<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a>;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    this-&gt;<a class="code" href="structfaiss_1_1Index.html#a5590d847c5c2b958affd2a05e58a6f23">verbose</a> = index-&gt;<a class="code" href="structfaiss_1_1Index.html#a5590d847c5c2b958affd2a05e58a6f23">verbose</a>;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    this-&gt;<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a> = index-&gt;<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    this-&gt;<a class="code" href="structfaiss_1_1Index.html#a8e18f641854b2bde83ecff0a2f9a6f4e">metric_type</a> = index-&gt;<a class="code" href="structfaiss_1_1Index.html#a8e18f641854b2bde83ecff0a2f9a6f4e">metric_type</a>;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  }</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  indices_.emplace_back(</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    std::make_pair(index,</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;                   std::unique_ptr&lt;WorkerThread&gt;(<span class="keyword">new</span> <a class="code" href="classfaiss_1_1gpu_1_1WorkerThread.html">WorkerThread</a>)));</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;}</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a99aaeb0573880fa4d6efaeb39f93deeb">   67</a></span>&#160;<a class="code" href="classfaiss_1_1gpu_1_1IndexProxy.html#a99aaeb0573880fa4d6efaeb39f93deeb">IndexProxy::removeIndex</a>(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>* index) {</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span> it = indices_.begin(); it != indices_.end(); ++it) {</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keywordflow">if</span> (it-&gt;first == index) {</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;      <span class="comment">// This is our index; stop the worker thread before removing it,</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;      <span class="comment">// to ensure that it has finished before function exit</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;      it-&gt;second-&gt;stop();</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;      it-&gt;second-&gt;waitForThreadExit();</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;      indices_.erase(it);</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;      <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    }</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  }</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;  <span class="comment">// index not found</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;  FAISS_ASSERT(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;}</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a4efa3134256a6cd6a98c45184a7e8dbf">   85</a></span>&#160;<a class="code" href="classfaiss_1_1gpu_1_1IndexProxy.html#a4efa3134256a6cd6a98c45184a7e8dbf">IndexProxy::runOnIndex</a>(std::function&lt;<span class="keywordtype">void</span>(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>*)&gt; f) {</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;  std::vector&lt;std::future&lt;bool&gt;&gt; v;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; index : indices_) {</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keyword">auto</span> indexPtr = index.first;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    v.emplace_back(index.second-&gt;add([indexPtr, f](){ f(indexPtr); }));</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;  }</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;  <span class="comment">// Blocking wait for completion</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; func : v) {</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    func.get();</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;  }</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;}</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a7f1b8287a607c80f2bb92f4ac0300649">  100</a></span>&#160;IndexProxy::reset() {</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  runOnIndex([](<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>* index){ index-&gt;<a class="code" href="structfaiss_1_1Index.html#a849361f5f0ab0aba8d419c86f2594191">reset</a>(); });</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  ntotal = 0;</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;}</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#aee6fe7e95b02238103a6a2d1f6d2cd00">  106</a></span>&#160;IndexProxy::train(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">Index::idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) {</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  runOnIndex([n, x](<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>* index){ index-&gt;<a class="code" href="structfaiss_1_1Index.html#a1ffe916c958605c38b0b1bfad42485e4">train</a>(n, x); });</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;}</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a61319b7ea215bf0ec6709443d8d4ee20">  111</a></span>&#160;IndexProxy::add(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">Index::idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) {</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;  runOnIndex([n, x](<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a>* index){ index-&gt;<a class="code" href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">add</a>(n, x); });</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  ntotal += n;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;}</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a8bf6d513b4f41fb533f0d023c1e143ba">  117</a></span>&#160;IndexProxy::reconstruct(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">Index::idx_t</a> n, <span class="keywordtype">float</span>* x)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    FAISS_ASSERT (count() &gt; 0);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    indices_[0].first-&gt;reconstruct (n, x);</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;}</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1IndexProxy.html#a25ed68079907eeeca9d441cdd4fc0740">  124</a></span>&#160;IndexProxy::search(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a> n,</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a> k,</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;                        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;                        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a>* labels)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;  FAISS_ASSERT(!indices_.empty());</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;  <span class="keywordflow">if</span> (n == 0) {</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;  }</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;  <span class="keyword">auto</span> dim = indices_.front().first-&gt;d;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;  std::vector&lt;std::future&lt;bool&gt;&gt; v;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;  <span class="comment">// Partition the query by the number of indices we have</span></div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  <span class="keyword">auto</span> queriesPerIndex =</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a>) (n + indices_.size() - 1) / indices_.size();</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  FAISS_ASSERT(n / queriesPerIndex &lt;= indices_.size());</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; indices_.size(); ++i) {</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="keyword">auto</span> base = i * queriesPerIndex;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <span class="keywordflow">if</span> (base &gt;= n) {</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    }</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <span class="keyword">auto</span> numForIndex = std::min(queriesPerIndex, n - base);</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    <span class="keyword">auto</span> queryStart = x + base * dim;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    <span class="keyword">auto</span> distancesStart = distances + base * k;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    <span class="keyword">auto</span> labelsStart = labels + base * k;</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <span class="keyword">auto</span> indexPtr = indices_[i].first;</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;    <span class="keyword">auto</span> fn =</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;      [indexPtr, numForIndex, queryStart, k, distancesStart, labelsStart]() {</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;      indexPtr-&gt;search(numForIndex, queryStart,</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;                            k, distancesStart, labelsStart);</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    };</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;    v.emplace_back(indices_[i].second-&gt;add(std::move(fn)));</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  }</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;  <span class="comment">// Blocking wait for completion</span></div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; f : v) {</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    f.get();</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  }</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;}</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="comment">// GPU clustering implementation</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="keywordtype">float</span> kmeans_clustering_gpu (<span class="keywordtype">int</span> ngpu, <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="l00177"></a><span class="lineno">  177</span>&#160;                             <span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;                             <span class="keywordtype">float</span> *centroids,</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;                             <span class="keywordtype">bool</span> useFloat16,</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;                             <span class="keywordtype">bool</span> storeTransposed)</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;{</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;    <a class="code" href="structfaiss_1_1Clustering.html">Clustering</a> clus (d, k);</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    <span class="comment">// display logs if &gt; 16Gflop per iteration</span></div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    clus.verbose = d * n * k &gt; (1L &lt;&lt; 34);</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;    FAISS_ASSERT(ngpu &gt;= 1);</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;    std::vector&lt;std::unique_ptr&lt;StandardGpuResources&gt; &gt; res;</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    std::vector&lt;std::unique_ptr&lt;GpuIndexFlatL2&gt; &gt; sub_indices;</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> dev_no = 0; dev_no &lt; ngpu; dev_no++) {</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;        res.emplace_back(<span class="keyword">new</span> <a class="code" href="classfaiss_1_1gpu_1_1StandardGpuResources.html">StandardGpuResources</a>());</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;        <a class="code" href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html">GpuIndexFlatConfig</a> config;</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;        config.<a class="code" href="structfaiss_1_1gpu_1_1GpuIndexConfig.html#aab05a0aa7b42feae7df4e556a52ead57">device</a> = dev_no;</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;        config.<a class="code" href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html#afd694186c87751937a646f3db2c8ba3d">useFloat16</a> = useFloat16;</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        config.<a class="code" href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html#a0342a26f5e59563bfe04f3f80e3b27f0">storeTransposed</a> = storeTransposed;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;        sub_indices.emplace_back(</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;          <span class="keyword">new</span> <a class="code" href="classfaiss_1_1gpu_1_1GpuIndexFlatL2.html">GpuIndexFlatL2</a>(res.back().get(), d, config));</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;    }</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    IndexProxy proxy;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;    <a class="code" href="structfaiss_1_1Index.html">Index</a> *index;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    <span class="keywordflow">if</span> (ngpu == 1) {</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;        index = sub_indices[0].get();</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;        <span class="keywordflow">for</span>(<span class="keywordtype">int</span> dev_no = 0; dev_no &lt; ngpu; dev_no++) {</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;            proxy.addIndex(sub_indices[dev_no].<span class="keyword">get</span>());</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;        }</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;        index = &amp;proxy;</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    }</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;    clus.<a class="code" href="structfaiss_1_1Index.html#a1ffe916c958605c38b0b1bfad42485e4">train</a> (n, x, *index);</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    memcpy(centroids, clus.centroids.data(), <span class="keyword">sizeof</span>(*centroids) * d * k);</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    <span class="keywordflow">return</span> clus.obj.back();</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;}</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;} } <span class="comment">// namespace</span></div>
<div class="ttc" id="structfaiss_1_1gpu_1_1GpuIndexFlatConfig_html_a0342a26f5e59563bfe04f3f80e3b27f0"><div class="ttname"><a href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html#a0342a26f5e59563bfe04f3f80e3b27f0">faiss::gpu::GpuIndexFlatConfig::storeTransposed</a></div><div class="ttdeci">bool storeTransposed</div><div class="ttdef"><b>Definition:</b> <a href="GpuIndexFlat_8h_source.html#l00048">GpuIndexFlat.h:48</a></div></div>
<div class="ttc" id="classfaiss_1_1gpu_1_1IndexProxy_html_a99aaeb0573880fa4d6efaeb39f93deeb"><div class="ttname"><a href="classfaiss_1_1gpu_1_1IndexProxy.html#a99aaeb0573880fa4d6efaeb39f93deeb">faiss::gpu::IndexProxy::removeIndex</a></div><div class="ttdeci">void removeIndex(faiss::Index *index)</div><div class="ttdef"><b>Definition:</b> <a href="IndexProxy_8cpp_source.html#l00067">IndexProxy.cpp:67</a></div></div>
<div class="ttc" id="classfaiss_1_1gpu_1_1IndexProxy_html_a4efa3134256a6cd6a98c45184a7e8dbf"><div class="ttname"><a href="classfaiss_1_1gpu_1_1IndexProxy.html#a4efa3134256a6cd6a98c45184a7e8dbf">faiss::gpu::IndexProxy::runOnIndex</a></div><div class="ttdeci">void runOnIndex(std::function&lt; void(faiss::Index *)&gt; f)</div><div class="ttdef"><b>Definition:</b> <a href="IndexProxy_8cpp_source.html#l00085">IndexProxy.cpp:85</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="classfaiss_1_1gpu_1_1WorkerThread_html"><div class="ttname"><a href="classfaiss_1_1gpu_1_1WorkerThread.html">faiss::gpu::WorkerThread</a></div><div class="ttdef"><b>Definition:</b> <a href="WorkerThread_8h_source.html#l00020">WorkerThread.h:20</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a1ffe916c958605c38b0b1bfad42485e4"><div class="ttname"><a href="structfaiss_1_1Index.html#a1ffe916c958605c38b0b1bfad42485e4">faiss::Index::train</a></div><div class="ttdeci">virtual void train(idx_t, const float *)</div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00089">Index.h:89</a></div></div>
<div class="ttc" id="structfaiss_1_1gpu_1_1GpuIndexFlatConfig_html_afd694186c87751937a646f3db2c8ba3d"><div class="ttname"><a href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html#afd694186c87751937a646f3db2c8ba3d">faiss::gpu::GpuIndexFlatConfig::useFloat16</a></div><div class="ttdeci">bool useFloat16</div><div class="ttdoc">Whether or not data is stored as float16. </div><div class="ttdef"><b>Definition:</b> <a href="GpuIndexFlat_8h_source.html#l00035">GpuIndexFlat.h:35</a></div></div>
<div class="ttc" id="structfaiss_1_1gpu_1_1GpuIndexConfig_html_aab05a0aa7b42feae7df4e556a52ead57"><div class="ttname"><a href="structfaiss_1_1gpu_1_1GpuIndexConfig.html#aab05a0aa7b42feae7df4e556a52ead57">faiss::gpu::GpuIndexConfig::device</a></div><div class="ttdeci">int device</div><div class="ttdoc">GPU device on which the index is resident. </div><div class="ttdef"><b>Definition:</b> <a href="GpuIndex_8h_source.html#l00027">GpuIndex.h:27</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a2a002388d2c081c2dbab8508dcefe73d"><div class="ttname"><a href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">faiss::Index::d</a></div><div class="ttdeci">int d</div><div class="ttdoc">vector dimension </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00064">Index.h:64</a></div></div>
<div class="ttc" id="structfaiss_1_1gpu_1_1GpuIndexFlatConfig_html"><div class="ttname"><a href="structfaiss_1_1gpu_1_1GpuIndexFlatConfig.html">faiss::gpu::GpuIndexFlatConfig</a></div><div class="ttdef"><b>Definition:</b> <a href="GpuIndexFlat_8h_source.html#l00027">GpuIndexFlat.h:27</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#l00057">Clustering.h:57</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="classfaiss_1_1gpu_1_1StandardGpuResources_html"><div class="ttname"><a href="classfaiss_1_1gpu_1_1StandardGpuResources.html">faiss::gpu::StandardGpuResources</a></div><div class="ttdef"><b>Definition:</b> <a href="StandardGpuResources_8h_source.html#l00023">StandardGpuResources.h:23</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a040c6aed1f224f3ea7bf58eebc0c31a4"><div class="ttname"><a href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a></div><div class="ttdeci">long idx_t</div><div class="ttdoc">all indices are this type </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00062">Index.h:62</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#l00065">Index.h:65</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a5590d847c5c2b958affd2a05e58a6f23"><div class="ttname"><a href="structfaiss_1_1Index.html#a5590d847c5c2b958affd2a05e58a6f23">faiss::Index::verbose</a></div><div class="ttdeci">bool verbose</div><div class="ttdoc">verbosity level </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00066">Index.h:66</a></div></div>
<div class="ttc" id="classfaiss_1_1gpu_1_1IndexProxy_html_af9bb81e75f8d5471094e4d4776a56f63"><div class="ttname"><a href="classfaiss_1_1gpu_1_1IndexProxy.html#af9bb81e75f8d5471094e4d4776a56f63">faiss::gpu::IndexProxy::addIndex</a></div><div class="ttdeci">void addIndex(faiss::Index *index)</div><div class="ttdef"><b>Definition:</b> <a href="IndexProxy_8cpp_source.html#l00032">IndexProxy.cpp:32</a></div></div>
<div class="ttc" id="classfaiss_1_1gpu_1_1GpuIndexFlatL2_html"><div class="ttname"><a href="classfaiss_1_1gpu_1_1GpuIndexFlatL2.html">faiss::gpu::GpuIndexFlatL2</a></div><div class="ttdef"><b>Definition:</b> <a href="GpuIndexFlat_8h_source.html#l00169">GpuIndexFlat.h:169</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a8e18f641854b2bde83ecff0a2f9a6f4e"><div class="ttname"><a href="structfaiss_1_1Index.html#a8e18f641854b2bde83ecff0a2f9a6f4e">faiss::Index::metric_type</a></div><div class="ttdeci">MetricType metric_type</div><div class="ttdoc">type of metric this index uses for search </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00072">Index.h:72</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#l00060">Index.h:60</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#l00069">Index.h:69</a></div></div>
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