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  • Lucas Hosseini's avatar
    Facebook sync (May 2019) + relicense (#838) · a8118acb
    Lucas Hosseini authored 
    Changelog:

- changed license: BSD+Patents -> MIT
- propagates exceptions raised in sub-indexes of IndexShards and IndexReplicas
- support for searching several inverted lists in parallel (parallel_mode != 0)
- better support for PQ codes where nbit != 8 or 16
- IVFSpectralHash implementation: spectral hash codes inside an IVF
- 6-bit per component scalar quantizer (4 and 8 bit were already supported)
- combinations of inverted lists: HStackInvertedLists and VStackInvertedLists
- configurable number of threads for OnDiskInvertedLists prefetching (including 0=no prefetch)
- more test and demo code compatible with Python 3 (print with parentheses)
- refactored benchmark code: data loading is now in a single file
    Unverified
    a8118acb
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<div class="title">/data/users/hoss/faiss/IndexHNSW.h</div>  </div>
</div><!--header-->
<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) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</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;HNSW.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &quot;IndexFlat.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &quot;IndexPQ.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &quot;IndexScalarQuantizer.h&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &quot;utils.h&quot;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</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;<span class="keyword">namespace </span>faiss {</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;<span class="keyword">struct </span>IndexHNSW;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="structfaiss_1_1ReconstructFromNeighbors.html">   25</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html">ReconstructFromNeighbors</a> {</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;    <span class="keyword">typedef</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">Index::idx_t</a> idx_t;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="keyword">typedef</span> <a class="code" href="structfaiss_1_1HNSW.html#ae1342fc2f07c325598a73b733e88ee74">HNSW::storage_idx_t</a> storage_idx_t;</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;    <span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> &amp; index;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="keywordtype">size_t</span> M; <span class="comment">// number of neighbors</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keywordtype">size_t</span> k; <span class="comment">// number of codebook entries</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="keywordtype">size_t</span> nsq; <span class="comment">// number of subvectors</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordtype">size_t</span> code_size;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    <span class="keywordtype">int</span> k_reorder; <span class="comment">// nb to reorder. -1 = all</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    std::vector&lt;float&gt; codebook; <span class="comment">// size nsq * k * (M + 1)</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    std::vector&lt;uint8_t&gt; codes; <span class="comment">// size ntotal * code_size</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <span class="keywordtype">size_t</span> ntotal;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="keywordtype">size_t</span> d, dsub; <span class="comment">// derived values</span></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="keyword">explicit</span> <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html">ReconstructFromNeighbors</a>(<span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a>&amp; index,</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;                                      <span class="keywordtype">size_t</span> k=256, <span class="keywordtype">size_t</span> nsq=1);</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">    /// codes must be added in the correct order and the IndexHNSW</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">    /// must be populated and sorted</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html#a454b7a5f7437a257df7404f5778fc833">add_codes</a>(<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x);</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keywordtype">size_t</span> compute_distances(<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> idx_t *shortlist,</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;                             <span class="keyword">const</span> <span class="keywordtype">float</span> *query, <span class="keywordtype">float</span> *distances) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">    /// called by add_codes</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html#a88ca99742dccc52ebb3324b507b6c872">estimate_code</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *x, storage_idx_t i, uint8_t *code) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">    /// called by compute_distances</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html#a6cf260c530e273e4d676804ac71128f8">reconstruct</a>(storage_idx_t i, <span class="keywordtype">float</span> *x, <span class="keywordtype">float</span> *tmp) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    <span class="keywordtype">void</span> reconstruct_n(storage_idx_t n0, storage_idx_t ni, <span class="keywordtype">float</span> *x) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">    /// get the M+1 -by-d table for neighbor coordinates for vector i</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html#aed256bdd9f48dc93cb9e33cfdfd5bde7">get_neighbor_table</a>(storage_idx_t i, <span class="keywordtype">float</span> *out) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;};</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;<span class="comment"></span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">/** The HNSW index is a normal random-access index with a HNSW</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment"> * link structure built on top */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexHNSW.html">   69</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> : <a class="code" href="structfaiss_1_1Index.html">Index</a> {</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    <span class="keyword">typedef</span> <a class="code" href="structfaiss_1_1HNSW.html#ae1342fc2f07c325598a73b733e88ee74">HNSW::storage_idx_t</a> storage_idx_t;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="comment">// the link strcuture</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <a class="code" href="structfaiss_1_1HNSW.html">HNSW</a> hnsw;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="comment">// the sequential storage</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="keywordtype">bool</span> own_fields;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <a class="code" href="structfaiss_1_1Index.html">Index</a> *storage;</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;    <a class="code" href="structfaiss_1_1ReconstructFromNeighbors.html">ReconstructFromNeighbors</a> *reconstruct_from_neighbors;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> (<span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a> = 0, <span class="keywordtype">int</span> M = 32);</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> (<a class="code" href="structfaiss_1_1Index.html">Index</a> *storage, <span class="keywordtype">int</span> M = 32);</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    ~<a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    <span class="comment">// get a DistanceComputer object for this kind of storage</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keyword">virtual</span> <a class="code" href="structfaiss_1_1DistanceComputer.html">DistanceComputer</a> *get_distance_computer() <span class="keyword">const</span> = 0;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#a04a761ce17d0f9040b3bc8a77bd627d9">add</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">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="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">    /// Trains the storage if needed</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#a40bc6d2c67545f95e322c63d68a47140">train</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">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="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">    /// entry point for search</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#ae0ddf6ab4a54239a25d6277e21e8548e">search</a> (<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> k,</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;                 <span class="keywordtype">float</span> *distances, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *labels) <span class="keyword">const override</span>;</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> <a class="code" href="structfaiss_1_1IndexHNSW.html#a660e5c8de1ba9c71bf3fe1f3bf0c8812">reconstruct</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> key, <span class="keywordtype">float</span>* recons) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#ad4b9f97d42e2521e01f8b60012985396">reset</a> () <span class="keyword">override</span>;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="keywordtype">void</span> shrink_level_0_neighbors(<span class="keywordtype">int</span> size);</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment">    /** Perform search only on level 0, given the starting points for</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">     * each vertex.</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">     * @param search_type 1:perform one search per nprobe, 2: enqueue</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="comment">     *                    all entry points</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#a5b619a41ddd52f0377efb701829c1e43">search_level_0</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> k,</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;                        <span class="keyword">const</span> storage_idx_t *nearest, <span class="keyword">const</span> <span class="keywordtype">float</span> *nearest_d,</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;                        <span class="keywordtype">float</span> *distances, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *labels, <span class="keywordtype">int</span> nprobe = 1,</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;                        <span class="keywordtype">int</span> search_type = 1) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">    /// alternative graph building</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#a9a86c58212f3f9cf88394f5297cba525">init_level_0_from_knngraph</a>(</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;                        <span class="keywordtype">int</span> k, <span class="keyword">const</span> <span class="keywordtype">float</span> *D, <span class="keyword">const</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *I);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="comment">    /// alternative graph building</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW.html#ab9c75063090927f8f65d1896b6949af4">init_level_0_from_entry_points</a>(</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                        <span class="keywordtype">int</span> npt, <span class="keyword">const</span> storage_idx_t *points,</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;                        <span class="keyword">const</span> storage_idx_t *nearests);</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="comment">// reorder links from nearest to farthest</span></div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keywordtype">void</span> reorder_links();</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="keywordtype">void</span> link_singletons();</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;};</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;<span class="comment">/** Flat index topped with with a HNSW structure to access elements</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="comment"> *  more efficiently.</span></div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexHNSWFlat.html">  137</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexHNSWFlat.html">IndexHNSWFlat</a> : <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> {</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWFlat.html">IndexHNSWFlat</a>();</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWFlat.html">IndexHNSWFlat</a>(<span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <span class="keywordtype">int</span> M);</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <a class="code" href="structfaiss_1_1DistanceComputer.html">DistanceComputer</a> *</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;      get_distance_computer() <span class="keyword">const override</span>;</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="comment"></span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="comment">/** PQ index topped with with a HNSW structure to access elements</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="comment"> *  more efficiently.</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexHNSWPQ.html">  147</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexHNSWPQ.html">IndexHNSWPQ</a> : <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> {</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWPQ.html">IndexHNSWPQ</a>();</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWPQ.html">IndexHNSWPQ</a>(<span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <span class="keywordtype">int</span> pq_m, <span class="keywordtype">int</span> M);</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSWPQ.html#ae99b976eeb25717d10055b1786aa011c">train</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">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="l00151"></a><span class="lineno">  151</span>&#160;    <a class="code" href="structfaiss_1_1DistanceComputer.html">DistanceComputer</a> *</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;      get_distance_computer() <span class="keyword">const override</span>;</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="comment"></span></div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;<span class="comment">/** SQ index topped with with a HNSW structure to access elements</span></div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="comment"> *  more efficiently.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexHNSWSQ.html">  158</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexHNSWSQ.html">IndexHNSWSQ</a> : <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> {</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWSQ.html">IndexHNSWSQ</a>();</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSWSQ.html">IndexHNSWSQ</a>(<span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">ScalarQuantizer::QuantizerType</a> qtype, <span class="keywordtype">int</span> M);</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;    <a class="code" href="structfaiss_1_1DistanceComputer.html">DistanceComputer</a> *</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;      get_distance_computer() <span class="keyword">const override</span>;</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"></span></div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;<span class="comment">/** 2-level code structure with fast random access</span></div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexHNSW2Level.html">  167</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexHNSW2Level.html">IndexHNSW2Level</a> : <a class="code" href="structfaiss_1_1IndexHNSW.html">IndexHNSW</a> {</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSW2Level.html">IndexHNSW2Level</a>();</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    <a class="code" href="structfaiss_1_1IndexHNSW2Level.html">IndexHNSW2Level</a>(<a class="code" href="structfaiss_1_1Index.html">Index</a> *quantizer, <span class="keywordtype">size_t</span> nlist, <span class="keywordtype">int</span> m_pq, <span class="keywordtype">int</span> M);</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    <a class="code" href="structfaiss_1_1DistanceComputer.html">DistanceComputer</a> *</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;      get_distance_computer() <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    <span class="keywordtype">void</span> flip_to_ivf();</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment">    /// entry point for search</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexHNSW2Level.html#a50a087a17ce5a7a1fbcca0836959b4ec">search</a> (<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> k,</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;                 <span class="keywordtype">float</span> *distances, <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;};</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;}  <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1IndexHNSWSQ_html"><div class="ttname"><a href="structfaiss_1_1IndexHNSWSQ.html">faiss::IndexHNSWSQ</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00158">IndexHNSW.h:158</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a1201dbd1611fa5c10782ade5d0e4952e"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">faiss::ScalarQuantizer::QuantizerType</a></div><div class="ttdeci">QuantizerType</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00034">IndexScalarQuantizer.h:34</a></div></div>
<div class="ttc" id="structfaiss_1_1DistanceComputer_html"><div class="ttname"><a href="structfaiss_1_1DistanceComputer.html">faiss::DistanceComputer</a></div><div class="ttdef"><b>Definition:</b> <a href="AuxIndexStructures_8h_source.html#l00231">AuxIndexStructures.h:231</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSWPQ_html_ae99b976eeb25717d10055b1786aa011c"><div class="ttname"><a href="structfaiss_1_1IndexHNSWPQ.html#ae99b976eeb25717d10055b1786aa011c">faiss::IndexHNSWPQ::train</a></div><div class="ttdeci">void train(idx_t n, const float *x) override</div><div class="ttdoc">Trains the storage if needed. </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l01016">IndexHNSW.cpp:1016</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW2Level_html_a50a087a17ce5a7a1fbcca0836959b4ec"><div class="ttname"><a href="structfaiss_1_1IndexHNSW2Level.html#a50a087a17ce5a7a1fbcca0836959b4ec">faiss::IndexHNSW2Level::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="ttdoc">entry point for search </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l01316">IndexHNSW.cpp:1316</a></div></div>
<div class="ttc" id="structfaiss_1_1ReconstructFromNeighbors_html"><div class="ttname"><a href="structfaiss_1_1ReconstructFromNeighbors.html">faiss::ReconstructFromNeighbors</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00025">IndexHNSW.h:25</a></div></div>
<div class="ttc" id="structfaiss_1_1ReconstructFromNeighbors_html_aed256bdd9f48dc93cb9e33cfdfd5bde7"><div class="ttname"><a href="structfaiss_1_1ReconstructFromNeighbors.html#aed256bdd9f48dc93cb9e33cfdfd5bde7">faiss::ReconstructFromNeighbors::get_neighbor_table</a></div><div class="ttdeci">void get_neighbor_table(storage_idx_t i, float *out) const </div><div class="ttdoc">get the M+1 -by-d table for neighbor coordinates for vector i </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00783">IndexHNSW.cpp:783</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW2Level_html"><div class="ttname"><a href="structfaiss_1_1IndexHNSW2Level.html">faiss::IndexHNSW2Level</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00167">IndexHNSW.h:167</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_a40bc6d2c67545f95e322c63d68a47140"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#a40bc6d2c67545f95e322c63d68a47140">faiss::IndexHNSW::train</a></div><div class="ttdeci">void train(idx_t n, const float *x) override</div><div class="ttdoc">Trains the storage if needed. </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00236">IndexHNSW.cpp:236</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_1Index_html_ad3f0d3071f987baabbdd3da4500c87ea"><div class="ttname"><a href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">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_1IndexHNSW_html_a04a761ce17d0f9040b3bc8a77bd627d9"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#a04a761ce17d0f9040b3bc8a77bd627d9">faiss::IndexHNSW::add</a></div><div class="ttdeci">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00294">IndexHNSW.cpp:294</a></div></div>
<div class="ttc" id="structfaiss_1_1ReconstructFromNeighbors_html_a6cf260c530e273e4d676804ac71128f8"><div class="ttname"><a href="structfaiss_1_1ReconstructFromNeighbors.html#a6cf260c530e273e4d676804ac71128f8">faiss::ReconstructFromNeighbors::reconstruct</a></div><div class="ttdeci">void reconstruct(storage_idx_t i, float *x, float *tmp) const </div><div class="ttdoc">called by compute_distances </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00648">IndexHNSW.cpp:648</a></div></div>
<div class="ttc" id="structfaiss_1_1ReconstructFromNeighbors_html_a88ca99742dccc52ebb3324b507b6c872"><div class="ttname"><a href="structfaiss_1_1ReconstructFromNeighbors.html#a88ca99742dccc52ebb3324b507b6c872">faiss::ReconstructFromNeighbors::estimate_code</a></div><div class="ttdeci">void estimate_code(const float *x, storage_idx_t i, uint8_t *code) const </div><div class="ttdoc">called by add_codes </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00802">IndexHNSW.cpp:802</a></div></div>
<div class="ttc" id="structfaiss_1_1HNSW_html"><div class="ttname"><a href="structfaiss_1_1HNSW.html">faiss::HNSW</a></div><div class="ttdef"><b>Definition:</b> <a href="HNSW_8h_source.html#l00046">HNSW.h:46</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSWPQ_html"><div class="ttname"><a href="structfaiss_1_1IndexHNSWPQ.html">faiss::IndexHNSWPQ</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00147">IndexHNSW.h:147</a></div></div>
<div class="ttc" id="structfaiss_1_1ReconstructFromNeighbors_html_a454b7a5f7437a257df7404f5778fc833"><div class="ttname"><a href="structfaiss_1_1ReconstructFromNeighbors.html#a454b7a5f7437a257df7404f5778fc833">faiss::ReconstructFromNeighbors::add_codes</a></div><div class="ttdeci">void add_codes(size_t n, const float *x)</div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00842">IndexHNSW.cpp:842</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html">faiss::IndexHNSW</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00069">IndexHNSW.h:69</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_ad4b9f97d42e2521e01f8b60012985396"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#ad4b9f97d42e2521e01f8b60012985396">faiss::IndexHNSW::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="IndexHNSW_8cpp_source.html#l00305">IndexHNSW.cpp:305</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSWFlat_html"><div class="ttname"><a href="structfaiss_1_1IndexHNSWFlat.html">faiss::IndexHNSWFlat</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8h_source.html#l00137">IndexHNSW.h:137</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html"><div class="ttname"><a href="structfaiss_1_1Index.html">faiss::Index</a></div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00061">Index.h:61</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_ab9c75063090927f8f65d1896b6949af4"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#ab9c75063090927f8f65d1896b6949af4">faiss::IndexHNSW::init_level_0_from_entry_points</a></div><div class="ttdeci">void init_level_0_from_entry_points(int npt, const storage_idx_t *points, const storage_idx_t *nearests)</div><div class="ttdoc">alternative graph building </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00465">IndexHNSW.cpp:465</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_ae0ddf6ab4a54239a25d6277e21e8548e"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#ae0ddf6ab4a54239a25d6277e21e8548e">faiss::IndexHNSW::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="ttdoc">entry point for search </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00243">IndexHNSW.cpp:243</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_a9a86c58212f3f9cf88394f5297cba525"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#a9a86c58212f3f9cf88394f5297cba525">faiss::IndexHNSW::init_level_0_from_knngraph</a></div><div class="ttdeci">void init_level_0_from_knngraph(int k, const float *D, const idx_t *I)</div><div class="ttdoc">alternative graph building </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00427">IndexHNSW.cpp:427</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_a5b619a41ddd52f0377efb701829c1e43"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#a5b619a41ddd52f0377efb701829c1e43">faiss::IndexHNSW::search_level_0</a></div><div class="ttdeci">void search_level_0(idx_t n, const float *x, idx_t k, const storage_idx_t *nearest, const float *nearest_d, float *distances, idx_t *labels, int nprobe=1, int search_type=1) const </div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00355">IndexHNSW.cpp:355</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexHNSW_html_a660e5c8de1ba9c71bf3fe1f3bf0c8812"><div class="ttname"><a href="structfaiss_1_1IndexHNSW.html#a660e5c8de1ba9c71bf3fe1f3bf0c8812">faiss::IndexHNSW::reconstruct</a></div><div class="ttdeci">void reconstruct(idx_t key, float *recons) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexHNSW_8cpp_source.html#l00312">IndexHNSW.cpp:312</a></div></div>
<div class="ttc" id="structfaiss_1_1HNSW_html_ae1342fc2f07c325598a73b733e88ee74"><div class="ttname"><a href="structfaiss_1_1HNSW.html#ae1342fc2f07c325598a73b733e88ee74">faiss::HNSW::storage_idx_t</a></div><div class="ttdeci">int storage_idx_t</div><div class="ttdoc">internal storage of vectors (32 bits: this is expensive) </div><div class="ttdef"><b>Definition:</b> <a href="HNSW_8h_source.html#l00048">HNSW.h:48</a></div></div>
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