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<div class="title">/data/users/matthijs/github_faiss/faiss/IndexLSH.cpp</div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment"></span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/**</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
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<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>
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<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>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// Copyright 2004-present Facebook. All Rights Reserved.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "IndexLSH.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <cstdio></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <cstring></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "utils.h"</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include "hamming.h"</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include "FaissAssert.h"</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">namespace </span>faiss {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/***************************************************************</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * IndexLSH</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> ***************************************************************/</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> IndexLSH::IndexLSH (idx_t d, <span class="keywordtype">int</span> nbits, <span class="keywordtype">bool</span> rotate_data, <span class="keywordtype">bool</span> train_thresholds):</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  Index(d), nbits(nbits), rotate_data(rotate_data),</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  train_thresholds (train_thresholds), rrot(d, nbits)</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> {</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a> = !train_thresholds;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  bytes_per_vec = (nbits + 7) / 8;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (rotate_data) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  rrot.init(5);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  FAISS_ASSERT(d >= nbits);</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  set_typename();</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> IndexLSH::IndexLSH ():</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  nbits (0), bytes_per_vec(0), rotate_data (false), train_thresholds (false)</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> {</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keywordtype">void</span> IndexLSH::set_typename()</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  std::stringstream s;</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  s << <span class="stringliteral">"LSH_"</span> << nbits << (rotate_data ? <span class="stringliteral">"r"</span> : <span class="stringliteral">""</span>);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  index_typename = s.str();</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> }</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
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<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea"> 59</a></span> <span class="keyword">const</span> <span class="keywordtype">float</span> * <a class="code" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">IndexLSH::apply_preprocess</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)<span class="keyword"> const</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">float</span> *xt = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (rotate_data) {</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// also applies bias if exists</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  xt = <a class="code" href="structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8">rrot</a>.<a class="code" href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">apply</a> (n, x);</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (d != nbits) {</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  xt = <span class="keyword">new</span> <span class="keywordtype">float</span> [nbits * n];</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">float</span> *xp = xt;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">for</span> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> i = 0; i < n; i++) {</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *xl = x + i * <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; j++)</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  *xp++ = xl [j];</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  }</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (train_thresholds) {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">if</span> (xt == NULL) {</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  xt = <span class="keyword">new</span> <span class="keywordtype">float</span> [nbits * n];</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  memcpy (xt, x, <span class="keyword">sizeof</span>(*x) * n * nbits);</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">float</span> *xp = xt;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">for</span> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> i = 0; i < n; i++)</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; j++)</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  *xp++ -= <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a> [j];</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> xt ? xt : x;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> }</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
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<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06"> 94</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06">IndexLSH::train</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> {</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (train_thresholds) {</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a>.resize (nbits);</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  train_thresholds = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *xt = <a class="code" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">apply_preprocess</a> (n, x);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  train_thresholds = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">float</span> * transposed_x = <span class="keyword">new</span> <span class="keywordtype">float</span> [n * <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>];</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">for</span> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> i = 0; i < n; i++)</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">for</span> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> j = 0; j < <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; j++)</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  transposed_x [j * n + i] = xt [i * nbits + j];</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (xt != x) <span class="keyword">delete</span> [] xt;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">for</span> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> i = 0; i < <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; i++) {</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">float</span> *xi = transposed_x + i * n;</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// std::nth_element</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  std::sort (xi, xi + n);</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (n % 2 == 1)</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a> [i] = xi [n / 2];</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a> [i] = (xi [n / 2 - 1] + xi [n / 2]) / 2;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a> = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> }</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div>
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<div class="line"><a name="l00124"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8"> 124</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8">IndexLSH::add</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> {</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  FAISS_ASSERT (<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>);</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *xt = <a class="code" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">apply_preprocess</a> (n, x);</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">codes</a>.resize ((<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> + n) * <a class="code" href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6">bytes_per_vec</a>);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  fvecs2bitvecs (xt, &<a class="code" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">codes</a>[<a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> * bytes_per_vec], nbits, n);</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">if</span> (x != xt)</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keyword">delete</span> [] xt;</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> += n;</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> }</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
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<div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee"> 137</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee">IndexLSH::search</a> (</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordtype">float</span> *distances,</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> *labels)<span class="keyword"> const</span></div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  FAISS_ASSERT (<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>);</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *xt = <a class="code" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">apply_preprocess</a> (n, x);</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  uint8_t * qcodes = <span class="keyword">new</span> uint8_t [n * <a class="code" href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6">bytes_per_vec</a>];</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  fvecs2bitvecs (xt, qcodes, nbits, n);</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (x != xt)</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">delete</span> [] xt;</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordtype">int</span> * idistances = <span class="keyword">new</span> <span class="keywordtype">int</span> [n * k];</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <a class="code" href="structfaiss_1_1HeapArray.html">int_maxheap_array_t</a> res = { size_t(n), size_t(k), labels, idistances};</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <a class="code" href="namespacefaiss.html#ac0b4dc73a8470d61f510396dc460ca18">hammings_knn</a> (&res, qcodes, <a class="code" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">codes</a>.data(),</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a>, <a class="code" href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6">bytes_per_vec</a>, <span class="keyword">true</span>);</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keyword">delete</span> [] qcodes;</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// convert distances to floats</span></div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < k * n; i++)</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  distances[i] = idistances[i];</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keyword">delete</span> [] idistances;</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> }</div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
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<div class="line"><a name="l00169"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c"> 169</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c">IndexLSH::transfer_thresholds</a> (<a class="code" href="structfaiss_1_1LinearTransform.html">LinearTransform</a> *vt) {</div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">if</span> (!train_thresholds) <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  FAISS_ASSERT (nbits == vt-><a class="code" href="structfaiss_1_1VectorTransform.html#a589d612f7b1773614619a0cbecd728a9">d_out</a>);</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span> (!vt->have_bias) {</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  vt-><a class="code" href="structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87">b</a>.resize (nbits, 0);</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  vt->have_bias = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; i++)</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  vt-><a class="code" href="structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87">b</a>[i] -= <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a>[i];</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  train_thresholds = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a>.clear();</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> }</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div>
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<div class="line"><a name="l00182"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab"> 182</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab">IndexLSH::reset</a>() {</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <a class="code" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">codes</a>.clear();</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <a class="code" href="structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd">ntotal</a> = 0;</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> }</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> } <span class="comment">// namespace faiss</span></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a0116f529bc5de64a7ef142caa652d9f6"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6">faiss::IndexLSH::bytes_per_vec</a></div><div class="ttdeci">int bytes_per_vec</div><div class="ttdoc">nb of 8-bits per encoded vector </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00029">IndexLSH.h:29</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_ae203ad895b15ae16fc1a748661b84df3"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">faiss::IndexLSH::thresholds</a></div><div class="ttdeci">std::vector< float > thresholds</div><div class="ttdoc">thresholds to compare with </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00035">IndexLSH.h:35</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a66b6afb56afa1f58e2d93abfdfd223ee"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee">faiss::IndexLSH::search</a></div><div class="ttdeci">virtual void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00137">IndexLSH.cpp:137</a></div></div>
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<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#l00066">Index.h:66</a></div></div>
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<div class="ttc" id="structfaiss_1_1LinearTransform_html_ab0383f690aeb823876e9143febad1a87"><div class="ttname"><a href="structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87">faiss::LinearTransform::b</a></div><div class="ttdeci">std::vector< float > b</div><div class="ttdoc">bias vector, size d_out </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00087">VectorTransform.h:87</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a71c8aa08d3bd0483ccc0f11c22cd3cd8"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8">faiss::IndexLSH::rrot</a></div><div class="ttdeci">RandomRotationMatrix rrot</div><div class="ttdoc">optional random rotation </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00033">IndexLSH.h:33</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_ac95fb0b3cb8fe2b265be9822c41c448c"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c">faiss::IndexLSH::transfer_thresholds</a></div><div class="ttdeci">void transfer_thresholds(LinearTransform *vt)</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00169">IndexLSH.cpp:169</a></div></div>
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<div class="ttc" id="structfaiss_1_1LinearTransform_html"><div class="ttname"><a href="structfaiss_1_1LinearTransform.html">faiss::LinearTransform</a></div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00078">VectorTransform.h:78</a></div></div>
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<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#l00351">Heap.h:351</a></div></div>
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<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#l00064">Index.h:64</a></div></div>
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<div class="ttc" id="namespacefaiss_html_ac0b4dc73a8470d61f510396dc460ca18"><div class="ttname"><a href="namespacefaiss.html#ac0b4dc73a8470d61f510396dc460ca18">faiss::hammings_knn</a></div><div class="ttdeci">void hammings_knn(int_maxheap_array_t *ha, const uint8_t *a, const uint8_t *b, size_t nb, size_t ncodes, int order)</div><div class="ttdef"><b>Definition:</b> <a href="hamming_8cpp_source.html#l00471">hamming.cpp:471</a></div></div>
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<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>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_aba7791311191bb168b79f8f59dd459ab"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab">faiss::IndexLSH::reset</a></div><div class="ttdeci">virtual void reset() override</div><div class="ttdoc">removes all elements from the database. </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00182">IndexLSH.cpp:182</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a76de2c3212c72fd48136d84283a6e0a8"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8">faiss::IndexLSH::add</a></div><div class="ttdeci">virtual void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00124">IndexLSH.cpp:124</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a01f569a16a812aa3945b8a0b64eaff06"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06">faiss::IndexLSH::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00094">IndexLSH.cpp:94</a></div></div>
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<div class="ttc" id="structfaiss_1_1VectorTransform_html_a589d612f7b1773614619a0cbecd728a9"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#a589d612f7b1773614619a0cbecd728a9">faiss::VectorTransform::d_out</a></div><div class="ttdeci">int d_out</div><div class="ttdoc">! input dimension </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00034">VectorTransform.h:34</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_af8c48006f210f0cbbf45ec9972558d20"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">faiss::IndexLSH::nbits</a></div><div class="ttdeci">int nbits</div><div class="ttdoc">nb of bits per vector </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00028">IndexLSH.h:28</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_ae7bb111e0aa6bd1b2a13e5efa8ef9cea"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">faiss::IndexLSH::apply_preprocess</a></div><div class="ttdeci">const float * apply_preprocess(idx_t n, const float *x) const </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00059">IndexLSH.cpp:59</a></div></div>
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<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>
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<div class="ttc" id="structfaiss_1_1VectorTransform_html_af3b3a8bf95911f4b28128001c83f91a5"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">faiss::VectorTransform::apply</a></div><div class="ttdeci">float * apply(idx_t n, const float *x) const </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8cpp_source.html#l00068">VectorTransform.cpp:68</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexLSH_html_a55c0f1127850af0d06ef22fc8b791572"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">faiss::IndexLSH::codes</a></div><div class="ttdeci">std::vector< uint8_t > codes</div><div class="ttdoc">encoded dataset </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00038">IndexLSH.h:38</a></div></div>
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