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<div class="title">test_ivfpq_indexing.cpp</div> </div>
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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"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
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<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>
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<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>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// Copyright 2004-present Facebook. All Rights Reserved</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <cstdio></span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <cstdlib></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 <gtest/gtest.h></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <faiss/IndexIVFPQ.h></span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <faiss/IndexFlat.h></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <faiss/index_io.h></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> TEST(IVFPQ, accuracy) {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="comment">// dimension of the vectors to index</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordtype">int</span> d = 64;</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">// size of the database we plan to index</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">size_t</span> nb = 1000;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// make a set of nt training vectors in the unit cube</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="comment">// (could be the database)</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">size_t</span> nt = 1500;</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="comment">// make the index object and train it</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <a class="code" href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a> coarse_quantizer (d);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// a reasonable number of cetroids to index nb vectors</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">int</span> ncentroids = 25;</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>  <a class="code" href="structfaiss_1_1IndexIVFPQ.html">faiss::IndexIVFPQ</a> index (&coarse_quantizer, d,</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  ncentroids, 16, 8);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// index that gives the ground-truth</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a> index_gt (d);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  srand48 (35);</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>  { <span class="comment">// training</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  std::vector <float> trainvecs (nt * d);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nt * d; i++) {</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  trainvecs[i] = drand48();</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>  index.verbose = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  index.train (nt, trainvecs.data());</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  { <span class="comment">// populating the database</span></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>  std::vector <float> database (nb * d);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nb * d; i++) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  database[i] = drand48();</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> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  index.add (nb, database.data());</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  index_gt.add (nb, database.data());</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordtype">int</span> nq = 200;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">int</span> n_ok;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  { <span class="comment">// searching the database</span></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  std::vector <float> queries (nq * d);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nq * d; i++) {</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  queries[i] = drand48();</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> </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  std::vector<faiss::Index::idx_t> gt_nns (nq);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  std::vector<float> gt_dis (nq);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  index_gt.search (nq, queries.data(), 1,</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  gt_dis.data(), gt_nns.data());</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>  index.nprobe = 5;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">int</span> k = 5;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  std::vector<faiss::Index::idx_t> nns (k * nq);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  std::vector<float> dis (k * nq);</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>  index.search (nq, queries.data(), k, dis.data(), nns.data());</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  n_ok = 0;</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> q = 0; q < nq; q++) {</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < k; i++)</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">if</span> (nns[q * k + i] == gt_nns[q])</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  n_ok++;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  EXPECT_GT(n_ok, nq * 0.4);</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> }</div>
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<div class="ttc" id="structfaiss_1_1IndexFlatL2_html"><div class="ttname"><a href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00079">IndexFlat.h:79</a></div></div>
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<div class="ttc" id="structfaiss_1_1IndexIVFPQ_html"><div class="ttname"><a href="structfaiss_1_1IndexIVFPQ.html">faiss::IndexIVFPQ</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFPQ_8h_source.html#l00029">IndexIVFPQ.h:29</a></div></div>
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