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<li class="navelem"><a class="el" href="dir_1df44a9b705f43f2ce1efa42430a4914.html">tests</a></li> </ul>
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<div class="title">test_binary_flat.cpp</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>
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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="preprocessor">#include <cstdio></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <cstdlib></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 <gtest/gtest.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 <faiss/IndexBinaryFlat.h></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <faiss/hamming.h></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> TEST(BinaryFlat, accuracy) {</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="comment">// dimension of the vectors to index</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordtype">int</span> d = 64;</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="comment">// size of the database we plan to index</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordtype">size_t</span> nb = 1000;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="comment">// make the index object and train it</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <a class="code" href="structfaiss_1_1IndexBinaryFlat.html">faiss::IndexBinaryFlat</a> index(d);</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  srand(35);</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>  std::vector<uint8_t> database(nb * (d / 8));</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nb * (d / 8); i++) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  database[i] = rand() % 0x100;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  }</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>  { <span class="comment">// populating the database</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  index.add(nb, database.data());</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  }</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="keywordtype">int</span> nq = 200;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  { <span class="comment">// searching the database</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  std::vector<uint8_t> queries(nq * (d / 8));</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nq * (d / 8); i++) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  queries[i] = rand() % 0x100;</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> </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordtype">int</span> k = 5;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  std::vector<faiss::IndexBinary::idx_t> nns(k * nq);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  std::vector<int> dis(k * nq);</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>  index.search(nq, queries.data(), k, dis.data(), nns.data());</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nq; ++i) {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <a class="code" href="structfaiss_1_1HammingComputer8.html">faiss::HammingComputer8</a> hc(queries.data() + i * (d / 8), d / 8);</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  hamdis_t dist_min = hc.hamming(database.data());</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 1; j < nb; ++j) {</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  hamdis_t dist = hc.hamming(database.data() + j * (d / 8));</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (dist < dist_min) {</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  dist_min = dist;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</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>  EXPECT_EQ(dist_min, dis[k * i]);</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> }</div>
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<div class="ttc" id="structfaiss_1_1IndexBinaryFlat_html"><div class="ttname"><a href="structfaiss_1_1IndexBinaryFlat.html">faiss::IndexBinaryFlat</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexBinaryFlat_8h_source.html#l00022">IndexBinaryFlat.h:22</a></div></div>
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<div class="ttc" id="structfaiss_1_1HammingComputer8_html"><div class="ttname"><a href="structfaiss_1_1HammingComputer8.html">faiss::HammingComputer8</a></div><div class="ttdef"><b>Definition:</b> <a href="hamming_8h_source.html#l00201">hamming.h:201</a></div></div>
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