199 lines
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199 lines
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<div class="title">1-Flat.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="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 <faiss/IndexFlat.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> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keywordtype">int</span> main() {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keywordtype">int</span> d = 64; <span class="comment">// dimension</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordtype">int</span> nb = 100000; <span class="comment">// database size</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordtype">int</span> nq = 10000; <span class="comment">// nb of queries</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>  <span class="keywordtype">float</span> *xb = <span class="keyword">new</span> <span class="keywordtype">float</span>[d * nb];</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordtype">float</span> *xq = <span class="keyword">new</span> <span class="keywordtype">float</span>[d * nq];</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < nb; i++) {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j < d; j++)</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  xb[d * i + j] = drand48();</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  xb[d * i] += i / 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> </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < nq; i++) {</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">int</span> j = 0; j < d; j++)</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  xq[d * i + j] = drand48();</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  xq[d * i] += i / 1000.;</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> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a> index(d); <span class="comment">// call constructor</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  printf(<span class="stringliteral">"is_trained = %s\n"</span>, index.is_trained ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>);</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  index.add(nb, xb); <span class="comment">// add vectors to the index</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  printf(<span class="stringliteral">"ntotal = %ld\n"</span>, index.ntotal);</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="keywordtype">int</span> k = 4;</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>  { <span class="comment">// sanity check: search 5 first vectors of xb</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">long</span> *I = <span class="keyword">new</span> <span class="keywordtype">long</span>[k * 5];</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">float</span> *D = <span class="keyword">new</span> <span class="keywordtype">float</span>[k * 5];</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>  index.search(5, xb, k, D, I);</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>  <span class="comment">// print results</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  printf(<span class="stringliteral">"I=\n"</span>);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < 5; i++) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j < k; j++)</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  printf(<span class="stringliteral">"%5ld "</span>, I[i * k + j]);</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  printf(<span class="stringliteral">"\n"</span>);</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>  printf(<span class="stringliteral">"D=\n"</span>);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < 5; i++) {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j < k; j++)</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  printf(<span class="stringliteral">"%7g "</span>, D[i * k + j]);</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  printf(<span class="stringliteral">"\n"</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> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">delete</span> [] I;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">delete</span> [] D;</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> </div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  { <span class="comment">// search xq</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordtype">long</span> *I = <span class="keyword">new</span> <span class="keywordtype">long</span>[k * nq];</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordtype">float</span> *D = <span class="keyword">new</span> <span class="keywordtype">float</span>[k * nq];</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>  index.search(nq, xq, k, D, I);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// print results</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  printf(<span class="stringliteral">"I (5 first results)=\n"</span>);</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i < 5; i++) {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j < k; j++)</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  printf(<span class="stringliteral">"%5ld "</span>, I[i * k + j]);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  printf(<span class="stringliteral">"\n"</span>);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  printf(<span class="stringliteral">"I (5 last results)=\n"</span>);</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = nq - 5; i < nq; i++) {</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j < k; j++)</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  printf(<span class="stringliteral">"%5ld "</span>, I[i * k + j]);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  printf(<span class="stringliteral">"\n"</span>);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">delete</span> [] I;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">delete</span> [] D;</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keyword">delete</span> [] xb;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">delete</span> [] xq;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</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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