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<div class="title">/data/users/hoss/faiss/IndexIVFSpectralHash.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>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <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> <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> <span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</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">#include "IndexIVFSpectralHash.h"</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <memory></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <algorithm></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 "hamming.h"</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "utils.h"</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "FaissAssert.h"</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "AuxIndexStructures.h"</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include "VectorTransform.h"</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> IndexIVFSpectralHash::IndexIVFSpectralHash (</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  Index * quantizer, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nlist,</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">int</span> nbit, <span class="keywordtype">float</span> period):</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  IndexIVF (quantizer, d, nlist, (nbit + 7) / 8, METRIC_L2),</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  nbit (nbit), period (period), threshold_type (Thresh_global)</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1Index2Layer.html#a66403863c8ec987ed83b4d7ef4064fe9">code_size</a> % 4 == 0);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  RandomRotationMatrix *rr = <span class="keyword">new</span> RandomRotationMatrix (d, nbit);</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  rr->init (1234);</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  vt = rr;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  own_fields = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a> = <span class="keyword">false</span>;</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> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> IndexIVFSpectralHash::IndexIVFSpectralHash():</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  IndexIVF(), vt(nullptr), own_fields(false),</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  nbit(0), period(0), threshold_type(Thresh_global)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {}</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> IndexIVFSpectralHash::~IndexIVFSpectralHash ()</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (own_fields) {</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">delete</span> vt;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</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">float</span> median (<span class="keywordtype">size_t</span> n, <span class="keywordtype">float</span> *x) {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  std::sort(x, x + n);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (n % 2 == 1) {</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> x [n / 2];</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> (x [n / 2 - 1] + x [n / 2]) / 2;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</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> }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707"> 66</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707">IndexIVFSpectralHash::train_residual</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)</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (!vt-><a class="code" href="structfaiss_1_1VectorTransform.html#ab511f1ddf608c00204555881ca28cb02">is_trained</a>) {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  vt-><a class="code" href="structfaiss_1_1VectorTransform.html#a7350d4dd28d60866d55ba4f75d2da84c">train</a> (n, x);</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> </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (threshold_type == Thresh_global) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// nothing to do</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (threshold_type == Thresh_centroid ||</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  threshold_type == Thresh_centroid_half) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// convert all centroids with vt</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  std::vector<float> centroids (nlist * d);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  quantizer->reconstruct_n (0, nlist, centroids.data());</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  trained.resize(nlist * nbit);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  vt-><a class="code" href="structfaiss_1_1VectorTransform.html#a90f1a218c224c049f1bd8b77a78d6aa0">apply_noalloc</a> (nlist, centroids.data(), trained.data());</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (threshold_type == Thresh_centroid_half) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nlist * nbit; i++) {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  trained[i] -= 0.25 * period;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// otherwise train medians</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// assign</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  std::unique_ptr<idx_t []> idx (<span class="keyword">new</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> [n]);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  quantizer->assign (n, x, idx.get());</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  std::vector<size_t> sizes(nlist + 1);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  FAISS_THROW_IF_NOT (idx[i] >= 0);</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  sizes[idx[i]]++;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">size_t</span> ofs = 0;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < <a class="code" href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">nlist</a>; j++) {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">size_t</span> o0 = ofs;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  ofs += sizes[j];</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  sizes[j] = o0;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// transform</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  std::unique_ptr<float []> xt (vt-><a class="code" href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">apply</a> (n, x));</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// transpose + reorder</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  std::unique_ptr<float []> xo (<span class="keyword">new</span> <span class="keywordtype">float</span>[n * nbit]);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordtype">size_t</span> idest = sizes[idx[i]]++;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < nbit; j++) {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  xo[idest + n * j] = xt[i * nbit + j];</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  trained.resize (n * nbit);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// compute medians</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="preprocessor">#pragma omp for</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">nlist</a>; i++) {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordtype">size_t</span> i0 = i == 0 ? 0 : sizes[i - 1];</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">size_t</span> i1 = sizes[i];</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < nbit; j++) {</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">float</span> *xoi = xo.get() + i0 + n * j;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (i0 == i1) { <span class="comment">// nothing to train</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  trained[i * nbit + j] = 0.0;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (i1 == i0 + 1) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  trained[i * nbit + j] = xoi[0];</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  trained[i * nbit + j] = median(i1 - i0, xoi);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="keywordtype">void</span> binarize_with_freq(<span class="keywordtype">size_t</span> nbit, <span class="keywordtype">float</span> freq,</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *x, <span class="keyword">const</span> <span class="keywordtype">float</span> *c,</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  uint8_t *codes)</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> {</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  memset (codes, 0, (nbit + 7) / 8);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < nbit; i++) {</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordtype">float</span> xf = (x[i] - c[i]);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordtype">int</span> xi = int(floor(xf * freq));</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordtype">int</span> bit = xi & 1;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  codes[i >> 3] |= bit << (i & 7);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> };</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
<div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64"> 161</a></span> <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64">IndexIVFSpectralHash::encode_vectors</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_in,</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">const</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *list_nos,</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  uint8_t * codes)<span class="keyword"> const</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="keyword"></span>{</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">float</span> freq = 2.0 / period;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="comment">// transform with vt</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  std::unique_ptr<float []> x (vt-><a class="code" href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">apply</a> (n, x_in));</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="preprocessor">#pragma omp parallel</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="preprocessor"></span> {</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  std::vector<float> zero (nbit);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// each thread takes care of a subset of lists</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="preprocessor">#pragma omp for</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordtype">long</span> list_no = list_nos [i];</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">if</span> (list_no >= 0) {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *c;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> (threshold_type == Thresh_global) {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  c = zero.data();</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  c = trained.data() + list_no * nbit;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  }</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  binarize_with_freq (nbit, freq,</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  x.get() + i * nbit, c,</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  codes + i * <a class="code" href="structfaiss_1_1IndexIVF.html#a46d1aeddb60643c5b3f096147c3e028f">code_size</a>) ;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="keyword">template</span><<span class="keyword">class</span> HammingComputer></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="keyword">struct </span>IVFScanner: <a class="code" href="structfaiss_1_1InvertedListScanner.html">InvertedListScanner</a> {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// copied from index structure</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html">IndexIVFSpectralHash</a> *index;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">size_t</span> code_size;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordtype">size_t</span> nbit;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordtype">bool</span> store_pairs;</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> </div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordtype">float</span> period, freq;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  std::vector<float> q;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  std::vector<float> zero;</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  std::vector<uint8_t> qcode;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="structfaiss_1_1HammingComputer.html">HammingComputer</a> hc;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keyword">using</span> idx_t = <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">Index::idx_t</a>;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  IVFScanner (<span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html">IndexIVFSpectralHash</a> * index,</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordtype">bool</span> store_pairs):</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  index (index),</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  code_size(index->code_size),</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  nbit(index->nbit),</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  store_pairs(store_pairs),</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  period(index->period), freq(2.0 / index->period),</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  q(nbit), zero(nbit), qcode(code_size),</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  hc(qcode.data(), code_size)</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  {</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordtype">void</span> set_query (<span class="keyword">const</span> <span class="keywordtype">float</span> *query)<span class="keyword"> override </span>{</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  FAISS_THROW_IF_NOT(query);</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  FAISS_THROW_IF_NOT(q.size() == nbit);</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  index->vt->apply_noalloc (1, query, q.data());</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordflow">if</span> (index->threshold_type ==</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  IndexIVFSpectralHash::Thresh_global) {</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  binarize_with_freq</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  (nbit, freq, q.data(), zero.data(), qcode.data());</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  hc.set (qcode.data(), code_size);</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  }</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  }</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  idx_t list_no;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordtype">void</span> set_list (idx_t list_no, <span class="keywordtype">float</span> <span class="comment">/*coarse_dis*/</span>)<span class="keyword"> override </span>{</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  this->list_no = list_no;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">if</span> (index->threshold_type != IndexIVFSpectralHash::Thresh_global) {</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> *c = index->trained.data() + list_no * nbit;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  binarize_with_freq (nbit, freq, q.data(), c, qcode.data());</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  hc.set (qcode.data(), code_size);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordtype">float</span> distance_to_code (<span class="keyword">const</span> uint8_t *code) <span class="keyword">const</span> <span class="keyword">final</span> {</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">return</span> hc.hamming (code);</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordtype">size_t</span> scan_codes (<span class="keywordtype">size_t</span> list_size,</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keyword">const</span> uint8_t *codes,</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keyword">const</span> idx_t *ids,</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordtype">float</span> *simi, idx_t *idxi,</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordtype">size_t</span> k)<span class="keyword"> const override</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordtype">size_t</span> nup = 0;</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < list_size; j++) {</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordtype">float</span> dis = hc.hamming (codes);</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (dis < simi [0]) {</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  maxheap_pop (k, simi, idxi);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordtype">long</span> <span class="keywordtype">id</span> = store_pairs ? (list_no << 32 | j) : ids[j];</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  maxheap_push (k, simi, idxi, dis, <span class="keywordtype">id</span>);</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  nup++;</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  codes += code_size;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  }</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">return</span> nup;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  }</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordtype">void</span> scan_codes_range (<span class="keywordtype">size_t</span> list_size,</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keyword">const</span> uint8_t *codes,</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keyword">const</span> idx_t *ids,</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordtype">float</span> radius,</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  RangeQueryResult & res)<span class="keyword"> const override</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < list_size; j++) {</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordtype">float</span> dis = hc.hamming (codes);</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keywordflow">if</span> (dis < radius) {</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordtype">long</span> <span class="keywordtype">id</span> = store_pairs ? (list_no << 32 | j) : ids[j];</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  res.add (dis, <span class="keywordtype">id</span>);</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  codes += code_size;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  }</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  }</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> };</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> } <span class="comment">// anonymous namespace</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> </div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> InvertedListScanner* <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062">IndexIVFSpectralHash::get_InvertedListScanner</a></div>
<div class="line"><a name="l00300"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062"> 300</a></span>  (<span class="keywordtype">bool</span> store_pairs) <span class="keyword">const</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> {</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keywordflow">switch</span> (code_size) {</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="preprocessor">#define HANDLE_CODE_SIZE(cs) \</span></div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="preprocessor"> case cs: \</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="preprocessor"> return new IVFScanner<HammingComputer ## cs> (this, store_pairs)</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="preprocessor"></span> HANDLE_CODE_SIZE(4);</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  HANDLE_CODE_SIZE(8);</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  HANDLE_CODE_SIZE(16);</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  HANDLE_CODE_SIZE(20);</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  HANDLE_CODE_SIZE(32);</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  HANDLE_CODE_SIZE(64);</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="preprocessor">#undef HANDLE_CODE_SIZE</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="preprocessor"></span> <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordflow">if</span> (code_size % 8 == 0) {</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> IVFScanner<HammingComputerM8>(<span class="keyword">this</span>, store_pairs);</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (code_size % 4 == 0) {</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> IVFScanner<HammingComputerM4>(<span class="keyword">this</span>, store_pairs);</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  FAISS_THROW_MSG(<span class="stringliteral">"not supported"</span>);</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  }</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  }</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> </div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> }</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> </div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> } <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1HammingComputer_html"><div class="ttname"><a href="structfaiss_1_1HammingComputer.html">faiss::HammingComputer</a></div><div class="ttdef"><b>Definition:</b> <a href="hamming_8h_source.html#l00402">hamming.h:402</a></div></div>
<div class="ttc" id="structfaiss_1_1Index2Layer_html_a66403863c8ec987ed83b4d7ef4064fe9"><div class="ttname"><a href="structfaiss_1_1Index2Layer.html#a66403863c8ec987ed83b4d7ef4064fe9">faiss::Index2Layer::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">code_size_1 + code_size_2 </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFPQ_8h_source.html#l00221">IndexIVFPQ.h:221</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html">faiss::IndexIVFSpectralHash</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8h_source.html#l00031">IndexIVFSpectralHash.h:31</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html_a4d82b242a308783e53a350fc0064e062"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062">faiss::IndexIVFSpectralHash::get_InvertedListScanner</a></div><div class="ttdeci">InvertedListScanner * get_InvertedListScanner(bool store_pairs) const override</div><div class="ttdoc">get a scanner for this index (store_pairs means ignore labels) </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00300">IndexIVFSpectralHash.cpp:300</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_1IndexIVFSpectralHash_html_a47c66c0610e9e7e42e584f5560791707"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707">faiss::IndexIVFSpectralHash::train_residual</a></div><div class="ttdeci">void train_residual(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00066">IndexIVFSpectralHash.cpp:66</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_ab511f1ddf608c00204555881ca28cb02"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#ab511f1ddf608c00204555881ca28cb02">faiss::VectorTransform::is_trained</a></div><div class="ttdeci">bool is_trained</div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00040">VectorTransform.h:40</a></div></div>
<div class="ttc" id="structfaiss_1_1InvertedListScanner_html"><div class="ttname"><a href="structfaiss_1_1InvertedListScanner.html">faiss::InvertedListScanner</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00272">IndexIVF.h:272</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_a7350d4dd28d60866d55ba4f75d2da84c"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#a7350d4dd28d60866d55ba4f75d2da84c">faiss::VectorTransform::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x)</div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8cpp_source.html#l00078">VectorTransform.cpp:78</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html_ab875c25aaf4fb2db0313b763c9294d64"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64">faiss::IndexIVFSpectralHash::encode_vectors</a></div><div class="ttdeci">void encode_vectors(idx_t n, const float *x, const idx_t *list_nos, uint8_t *codes) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00161">IndexIVFSpectralHash.cpp:161</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a6e92732617c4dbe364e7678dd8773a7f"><div class="ttname"><a href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">faiss::Index::is_trained</a></div><div class="ttdeci">bool is_trained</div><div class="ttdoc">set if the Index does not require training, or if training is done already </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00071">Index.h:71</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_af3b3a8bf95911f4b28128001c83f91a5"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">faiss::VectorTransform::apply</a></div><div class="ttdeci">float * apply(idx_t n, const float *x) const </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8cpp_source.html#l00070">VectorTransform.cpp:70</a></div></div>
<div class="ttc" id="structfaiss_1_1Level1Quantizer_html_a1c4fc9d874d9492ee0ea27a5be388fa7"><div class="ttname"><a href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">faiss::Level1Quantizer::nlist</a></div><div class="ttdeci">size_t nlist</div><div class="ttdoc">number of possible key values </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00033">IndexIVF.h:33</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_a90f1a218c224c049f1bd8b77a78d6aa0"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#a90f1a218c224c049f1bd8b77a78d6aa0">faiss::VectorTransform::apply_noalloc</a></div><div class="ttdeci">virtual void apply_noalloc(idx_t n, const float *x, float *xt) const =0</div><div class="ttdoc">same as apply, but result is pre-allocated </div></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html_a46d1aeddb60643c5b3f096147c3e028f"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html#a46d1aeddb60643c5b3f096147c3e028f">faiss::IndexIVF::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">code size per vector in bytes </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00095">IndexIVF.h:95</a></div></div>
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