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<div class="title">/tmp/faiss/IndexLSH.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This source code is licensed under the BSD+Patents license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#ifndef INDEX_LSH_H</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"></span><span class="preprocessor">#define INDEX_LSH_H</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <vector></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "Index.h"</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "VectorTransform.h"</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">/** The sign of each vector component is put in a binary signature */</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html"> 23</a></span> <span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexLSH.html">IndexLSH</a>:<a class="code" href="structfaiss_1_1Index.html">Index</a> {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> uint8_t;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
<div class="line"><a name="l00026"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20"> 26</a></span>  <span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>; <span class="comment">///< nb of bits per vector</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6"> 27</a></span> <span class="comment"></span> <span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6">bytes_per_vec</a>; <span class="comment">///< nb of 8-bits per encoded vector</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a71e9142e1256705f125ded9d647f4497"> 28</a></span> <span class="comment"></span> <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a71e9142e1256705f125ded9d647f4497">rotate_data</a>; <span class="comment">///< whether to apply a random rotation to input</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a5d4d6ea1fc709605d5b2061d1bce27d6"> 29</a></span> <span class="comment"></span> <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a5d4d6ea1fc709605d5b2061d1bce27d6">train_thresholds</a>; <span class="comment">///< whether we train thresholds or use 0</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8"> 31</a></span>  <a class="code" href="structfaiss_1_1RandomRotationMatrix.html">RandomRotationMatrix</a> <a class="code" href="structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8">rrot</a>; <span class="comment">///< optional random rotation</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3"> 33</a></span>  std::vector <float> <a class="code" href="structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3">thresholds</a>; <span class="comment">///< thresholds to compare with</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span><span class="comment"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> /// encoded dataset</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572"> 36</a></span> <span class="comment"></span> std::vector<uint8_t> <a class="code" href="structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572">codes</a>;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="structfaiss_1_1IndexLSH.html">IndexLSH</a> (</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20">nbits</a>,</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a71e9142e1256705f125ded9d647f4497">rotate_data</a> = <span class="keyword">true</span>,</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a5d4d6ea1fc709605d5b2061d1bce27d6">train_thresholds</a> = <span class="keyword">false</span>);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> /** Preprocesses and resizes the input to the size required to</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * binarize the data</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * @param x input vectors, size n * d</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * @return output vectors, size n * bits. May be the same pointer</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * as x, otherwise it should be deleted by the caller</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *<a class="code" href="structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea">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>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06">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) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8">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) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee">search</a>(</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a>* labels) <span class="keyword">const override</span>;</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>  <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> /// transfer the thresholds to a pre-processing stage (and unset</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> /// train_thresholds)</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c">transfer_thresholds</a> (<a class="code" href="structfaiss_1_1LinearTransform.html">LinearTransform</a> * vt);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  ~<a class="code" href="structfaiss_1_1IndexLSH.html">IndexLSH</a>()<span class="keyword"> override </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>  <a class="code" href="structfaiss_1_1IndexLSH.html">IndexLSH</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> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#endif</span></div>
<div class="ttc" id="structfaiss_1_1RandomRotationMatrix_html"><div class="ttname"><a href="structfaiss_1_1RandomRotationMatrix.html">faiss::RandomRotationMatrix</a></div><div class="ttdoc">Randomly rotate a set of vectors. </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00116">VectorTransform.h:116</a></div></div>
<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#l00027">IndexLSH.h:27</a></div></div>
<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#l00033">IndexLSH.h:33</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexLSH_html"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html">faiss::IndexLSH</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00023">IndexLSH.h:23</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexLSH_html_a5d4d6ea1fc709605d5b2061d1bce27d6"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a5d4d6ea1fc709605d5b2061d1bce27d6">faiss::IndexLSH::train_thresholds</a></div><div class="ttdeci">bool train_thresholds</div><div class="ttdoc">whether we train thresholds or use 0 </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00029">IndexLSH.h:29</a></div></div>
<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">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#l00129">IndexLSH.cpp:129</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#l00066">Index.h:66</a></div></div>
<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#l00031">IndexLSH.h:31</a></div></div>
<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#l00161">IndexLSH.cpp:161</a></div></div>
<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#l00076">VectorTransform.h:76</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#l00064">Index.h:64</a></div></div>
<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">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#l00174">IndexLSH.cpp:174</a></div></div>
<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">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00117">IndexLSH.cpp:117</a></div></div>
<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">void train(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8cpp_source.html#l00086">IndexLSH.cpp:86</a></div></div>
<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#l00026">IndexLSH.h:26</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#l00062">Index.h:62</a></div></div>
<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#l00051">IndexLSH.cpp:51</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexLSH_html_a71e9142e1256705f125ded9d647f4497"><div class="ttname"><a href="structfaiss_1_1IndexLSH.html#a71e9142e1256705f125ded9d647f4497">faiss::IndexLSH::rotate_data</a></div><div class="ttdeci">bool rotate_data</div><div class="ttdoc">whether to apply a random rotation to input </div><div class="ttdef"><b>Definition:</b> <a href="IndexLSH_8h_source.html#l00028">IndexLSH.h:28</a></div></div>
<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#l00036">IndexLSH.h:36</a></div></div>
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