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<div class="title">/tmp/faiss/IndexScalarQuantizer.h</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * This source code is licensed under the BSD+Patents license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#ifndef FAISS_INDEX_SCALAR_QUANTIZER_H</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FAISS_INDEX_SCALAR_QUANTIZER_H</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &quot;IndexIVF.h&quot;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> * The uniform quantizer has a range [vmin, vmax]. The range can be</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> * the same for all dimensions (uniform) or specific per dimension</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> * (default).</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html">   32</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1ScalarQuantizer.html">ScalarQuantizer</a> {</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">   34</a></span>&#160;    <span class="keyword">enum</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">QuantizerType</a> {</div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea1650389e3efa052ff60177d502328a2c">   35</a></span>&#160;        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea1650389e3efa052ff60177d502328a2c">QT_8bit</a>,             <span class="comment">///&lt; 8 bits per component</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952eacd3d1bd71533a7bc52149e4b3d1db13b">   36</a></span>&#160;<span class="comment"></span>        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952eacd3d1bd71533a7bc52149e4b3d1db13b">QT_4bit</a>,             <span class="comment">///&lt; 4 bits per component</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea029f07a15ea64e7e73daaf9633ac429a">   37</a></span>&#160;<span class="comment"></span>        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea029f07a15ea64e7e73daaf9633ac429a">QT_8bit_uniform</a>,     <span class="comment">///&lt; same, shared range for all dimensions</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment"></span>        QT_4bit_uniform,</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        QT_fp16,</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    };</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">QuantizerType</a> qtype;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">    /** The uniform encoder can estimate the range of representable</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">     * values of the unform encoder using different statistics. Here</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">     * rs = rangestat_arg */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="comment">// rangestat_arg.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06">   49</a></span>&#160;    <span class="keyword">enum</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06">RangeStat</a> {</div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06aa52f2f14616c61c04baf6323d43588fd">   50</a></span>&#160;        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06aa52f2f14616c61c04baf6323d43588fd">RS_minmax</a>,           <span class="comment">///&lt; [min - rs*(max-min), max + rs*(max-min)]</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06afb4b9f4ee9003fa0193e6de69632f7a0">   51</a></span>&#160;<span class="comment"></span>        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06afb4b9f4ee9003fa0193e6de69632f7a0">RS_meanstd</a>,          <span class="comment">///&lt; [mean - std * rs, mean + std * rs]</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ae41cccec3a7acbcb3a47fa63c2bfb4c8">   52</a></span>&#160;<span class="comment"></span>        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ae41cccec3a7acbcb3a47fa63c2bfb4c8">RS_quantiles</a>,        <span class="comment">///&lt; [Q(rs), Q(1-rs)]</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ab0709ff74c1b882b64a7fdd7ca5df9a3">   53</a></span>&#160;<span class="comment"></span>        <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ab0709ff74c1b882b64a7fdd7ca5df9a3">RS_optim</a>,            <span class="comment">///&lt; alternate optimization of reconstruction error</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment"></span>    };</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06">RangeStat</a> rangestat;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keywordtype">float</span> rangestat_arg;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">    /// dimension of input vectors</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#acd88af01ad1d06560cecc30bc38aef49">   60</a></span>&#160;<span class="comment"></span>    <span class="keywordtype">size_t</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#acd88af01ad1d06560cecc30bc38aef49">d</a>;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">    /// bytes per vector</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a647b8774e4cd8ca5623a194f5c7f8a33">   63</a></span>&#160;<span class="comment"></span>    <span class="keywordtype">size_t</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a647b8774e4cd8ca5623a194f5c7f8a33">code_size</a>;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">    /// trained values (including the range)</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer.html#a30b411b10780a74079bbbfaff678c86f">   66</a></span>&#160;<span class="comment"></span>    std::vector&lt;float&gt; <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a30b411b10780a74079bbbfaff678c86f">trained</a>;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer.html">ScalarQuantizer</a> (<span class="keywordtype">size_t</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#acd88af01ad1d06560cecc30bc38aef49">d</a>, <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">QuantizerType</a> qtype);</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer.html">ScalarQuantizer</a> ();</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    <span class="keywordtype">void</span> train (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x);</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">    /// same as compute_code for several vectors</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a2bccf276565c4f80fed3d0c715c58816">compute_codes</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                        uint8_t * codes,</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                        <span class="keywordtype">size_t</span> n) <span class="keyword">const</span> ;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">    /// decode a vector from a given code (or n vectors if third argument)</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a7ab9e9158da1777d45e6f9bf73bfd489">decode</a> (<span class="keyword">const</span> uint8_t *code, <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> n) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="comment">// fast, non thread-safe way of computing vector-to-code and</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="comment">// code-to-code distances.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html">   84</a></span>&#160;    <span class="keyword">struct </span><a class="code" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html">DistanceComputer</a> {</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">        /// vector-to-code distance computation</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment"></span>        <span class="keyword">virtual</span> <span class="keywordtype">float</span> <a class="code" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html#ae77082c0e7d01130834c1c615baa8249">compute_distance</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;                                        <span class="keyword">const</span> uint8_t *code) <span class="keyword">const</span> = 0;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">        /// code-to-code distance computation</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment"></span>        <span class="keyword">virtual</span> <span class="keywordtype">float</span> <a class="code" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html#ad18c347d6f68f91feda5a54e4de93fab">compute_code_distance</a> (<span class="keyword">const</span> uint8_t *code1,</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                                             <span class="keyword">const</span> uint8_t *code2) <span class="keyword">const</span> = 0;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        <span class="keyword">virtual</span> ~<a class="code" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html">DistanceComputer</a> () {}</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    };</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html">DistanceComputer</a> *get_distance_computer (<a class="code" href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">MetricType</a> metric = METRIC_L2)</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        <span class="keyword">const</span>;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;};</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexScalarQuantizer.html">  102</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexScalarQuantizer.html">IndexScalarQuantizer</a>: <a class="code" href="structfaiss_1_1Index.html">Index</a> {<span class="comment"></span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">    /// Used to encode the vectors</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexScalarQuantizer.html#a71381f74754d8a54812e80af46a2a83a">  104</a></span>&#160;<span class="comment"></span>    <a class="code" href="structfaiss_1_1ScalarQuantizer.html">ScalarQuantizer</a> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#a71381f74754d8a54812e80af46a2a83a">sq</a>;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">    /// Codes. Size ntotal * pq.code_size</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexScalarQuantizer.html#a861fa059f9d4ced9147e08193a2be9be">  107</a></span>&#160;<span class="comment"></span>    std::vector&lt;uint8_t&gt; <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#a861fa059f9d4ced9147e08193a2be9be">codes</a>;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keywordtype">size_t</span> code_size;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment">    /** Constructor.</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">     * @param d      dimensionality of the input vectors</span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment">     * @param M      number of subquantizers</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment">     * @param nbits  number of bit per subvector index</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html">IndexScalarQuantizer</a> (<span class="keywordtype">int</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>,</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;                          <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">ScalarQuantizer::QuantizerType</a> qtype,</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;                          <a class="code" href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">MetricType</a> metric = METRIC_L2);</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html">IndexScalarQuantizer</a> ();</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#a300647e9cdac9acd160f2c55c610056b">train</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#ad49602f9ecfcaa2ec8737a449b69ccd7">add</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#abf24732c29106bb808148c3d30599662">search</a>(</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a>* labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#af0d6b901a2a02fff34e5c7c1ea5b8d55">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#a06e6935b75f0b209f65fffa1c9e1477c">reconstruct_n</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> i0, <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> ni, <span class="keywordtype">float</span>* recons) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexScalarQuantizer.html#a8fb8680f64465d643d96119da58099f3">reconstruct</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> key, <span class="keywordtype">float</span>* recons) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;};</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="comment"> /** An IVF implementation where the components of the residuals are</span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="comment"> * encoded with a scalar uniform quantizer. All distance computations</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="comment"> * are asymmetric, so the encoded vectors are decoded and approximate</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="comment"> * distances are computed.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFScalarQuantizer.html">  149</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html">IndexIVFScalarQuantizer</a>: <a class="code" href="structfaiss_1_1IndexIVF.html">IndexIVF</a> {</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    <a class="code" href="structfaiss_1_1ScalarQuantizer.html">ScalarQuantizer</a> sq;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html">IndexIVFScalarQuantizer</a>(<a class="code" href="structfaiss_1_1Index.html">Index</a> *<a class="code" href="structfaiss_1_1Level1Quantizer.html#a3cf99e2ee92b8558a066f821efab95d5">quantizer</a>, <span class="keywordtype">size_t</span> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <span class="keywordtype">size_t</span> <a class="code" href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">nlist</a>,</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;                            <a class="code" href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">ScalarQuantizer::QuantizerType</a> qtype,</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;                            <a class="code" href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">MetricType</a> metric = METRIC_L2);</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html">IndexIVFScalarQuantizer</a>();</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html#ac05d7fbfed59c85d1cf8ae526d279744">train_residual</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html#a4079709524ca1abf344580b94b223e2a">encode_vectors</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;                        <span class="keyword">const</span> <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> *list_nos,</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                        uint8_t * codes) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html#afa95c17787b7e3dbed9309b440d4d748">add_with_ids</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x, <span class="keyword">const</span> <span class="keywordtype">long</span>* xids) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <a class="code" href="structfaiss_1_1InvertedListScanner.html">InvertedListScanner</a> *<a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html#ace901d49514b5b1384b6a07ec8a49363">get_InvertedListScanner</a> (<span class="keywordtype">bool</span> store_pairs)</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;        <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFScalarQuantizer.html#a0320af8f30a0e3491853743b8f6d0faa">reconstruct_from_offset</a> (<span class="keywordtype">long</span> list_no, <span class="keywordtype">long</span> offset,</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;                                  <span class="keywordtype">float</span>* recons) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;};</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;}</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00091">IndexIVF.h:91</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html_a4079709524ca1abf344580b94b223e2a"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html#a4079709524ca1abf344580b94b223e2a">faiss::IndexIVFScalarQuantizer::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="IndexScalarQuantizer_8cpp_source.html#l01155">IndexScalarQuantizer.cpp:1155</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a647b8774e4cd8ca5623a194f5c7f8a33"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a647b8774e4cd8ca5623a194f5c7f8a33">faiss::ScalarQuantizer::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">bytes per vector </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00063">IndexScalarQuantizer.h:63</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a1201dbd1611fa5c10782ade5d0e4952e"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952e">faiss::ScalarQuantizer::QuantizerType</a></div><div class="ttdeci">QuantizerType</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00034">IndexScalarQuantizer.h:34</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_abf24732c29106bb808148c3d30599662"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#abf24732c29106bb808148c3d30599662">faiss::IndexScalarQuantizer::search</a></div><div class="ttdeci">void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01072">IndexScalarQuantizer.cpp:1072</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html_ac05d7fbfed59c85d1cf8ae526d279744"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html#ac05d7fbfed59c85d1cf8ae526d279744">faiss::IndexIVFScalarQuantizer::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="IndexScalarQuantizer_8cpp_source.html#l01129">IndexScalarQuantizer.cpp:1129</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a867ad0000e4ccfd40bbb1e01e7882d06ab0709ff74c1b882b64a7fdd7ca5df9a3"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ab0709ff74c1b882b64a7fdd7ca5df9a3">faiss::ScalarQuantizer::RS_optim</a></div><div class="ttdoc">alternate optimization of reconstruction error </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00053">IndexScalarQuantizer.h:53</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html">faiss::IndexScalarQuantizer</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00102">IndexScalarQuantizer.h:102</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a1201dbd1611fa5c10782ade5d0e4952ea029f07a15ea64e7e73daaf9633ac429a"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea029f07a15ea64e7e73daaf9633ac429a">faiss::ScalarQuantizer::QT_8bit_uniform</a></div><div class="ttdoc">same, shared range for all dimensions </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00037">IndexScalarQuantizer.h:37</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html_a0320af8f30a0e3491853743b8f6d0faa"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html#a0320af8f30a0e3491853743b8f6d0faa">faiss::IndexIVFScalarQuantizer::reconstruct_from_offset</a></div><div class="ttdeci">void reconstruct_from_offset(long list_no, long offset, float *recons) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01418">IndexScalarQuantizer.cpp:1418</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_ad49602f9ecfcaa2ec8737a449b69ccd7"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#ad49602f9ecfcaa2ec8737a449b69ccd7">faiss::IndexScalarQuantizer::add</a></div><div class="ttdeci">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01017">IndexScalarQuantizer.cpp:1017</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a1201dbd1611fa5c10782ade5d0e4952eacd3d1bd71533a7bc52149e4b3d1db13b"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952eacd3d1bd71533a7bc52149e4b3d1db13b">faiss::ScalarQuantizer::QT_4bit</a></div><div class="ttdoc">4 bits per component </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00036">IndexScalarQuantizer.h:36</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer_html_ae77082c0e7d01130834c1c615baa8249"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html#ae77082c0e7d01130834c1c615baa8249">faiss::ScalarQuantizer::DistanceComputer::compute_distance</a></div><div class="ttdeci">virtual float compute_distance(const float *x, const uint8_t *code) const =0</div><div class="ttdoc">vector-to-code distance computation </div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_af0d6b901a2a02fff34e5c7c1ea5b8d55"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#af0d6b901a2a02fff34e5c7c1ea5b8d55">faiss::IndexScalarQuantizer::reset</a></div><div class="ttdeci">void reset() override</div><div class="ttdoc">removes all elements from the database. </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01087">IndexScalarQuantizer.cpp:1087</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html">faiss::ScalarQuantizer</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00032">IndexScalarQuantizer.h:32</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html_afa95c17787b7e3dbed9309b440d4d748"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html#afa95c17787b7e3dbed9309b440d4d748">faiss::IndexIVFScalarQuantizer::add_with_ids</a></div><div class="ttdeci">void add_with_ids(idx_t n, const float *x, const long *xids) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01188">IndexScalarQuantizer.cpp:1188</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a2a002388d2c081c2dbab8508dcefe73d"><div class="ttname"><a href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">faiss::Index::d</a></div><div class="ttdeci">int d</div><div class="ttdoc">vector dimension </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00066">Index.h:66</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_a861fa059f9d4ced9147e08193a2be9be"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#a861fa059f9d4ced9147e08193a2be9be">faiss::IndexScalarQuantizer::codes</a></div><div class="ttdeci">std::vector&lt; uint8_t &gt; codes</div><div class="ttdoc">Codes. Size ntotal * pq.code_size. </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00107">IndexScalarQuantizer.h:107</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer_html"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html">faiss::ScalarQuantizer::DistanceComputer</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00084">IndexScalarQuantizer.h:84</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_a71381f74754d8a54812e80af46a2a83a"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#a71381f74754d8a54812e80af46a2a83a">faiss::IndexScalarQuantizer::sq</a></div><div class="ttdeci">ScalarQuantizer sq</div><div class="ttdoc">Used to encode the vectors. </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00104">IndexScalarQuantizer.h:104</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a040c6aed1f224f3ea7bf58eebc0c31a4"><div class="ttname"><a href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">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#l00064">Index.h:64</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a867ad0000e4ccfd40bbb1e01e7882d06"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06">faiss::ScalarQuantizer::RangeStat</a></div><div class="ttdeci">RangeStat</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00049">IndexScalarQuantizer.h:49</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html">faiss::IndexIVFScalarQuantizer</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00149">IndexScalarQuantizer.h:149</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a867ad0000e4ccfd40bbb1e01e7882d06ae41cccec3a7acbcb3a47fa63c2bfb4c8"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06ae41cccec3a7acbcb3a47fa63c2bfb4c8">faiss::ScalarQuantizer::RS_quantiles</a></div><div class="ttdoc">[Q(rs), Q(1-rs)] </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00052">IndexScalarQuantizer.h:52</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a867ad0000e4ccfd40bbb1e01e7882d06afb4b9f4ee9003fa0193e6de69632f7a0"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06afb4b9f4ee9003fa0193e6de69632f7a0">faiss::ScalarQuantizer::RS_meanstd</a></div><div class="ttdoc">[mean - std * rs, mean + std * rs] </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00051">IndexScalarQuantizer.h:51</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#l00261">IndexIVF.h:261</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a7ab9e9158da1777d45e6f9bf73bfd489"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a7ab9e9158da1777d45e6f9bf73bfd489">faiss::ScalarQuantizer::decode</a></div><div class="ttdeci">void decode(const uint8_t *code, float *x, size_t n) const </div><div class="ttdoc">decode a vector from a given code (or n vectors if third argument) </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l00955">IndexScalarQuantizer.cpp:955</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFScalarQuantizer_html_ace901d49514b5b1384b6a07ec8a49363"><div class="ttname"><a href="structfaiss_1_1IndexIVFScalarQuantizer.html#ace901d49514b5b1384b6a07ec8a49363">faiss::IndexIVFScalarQuantizer::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="IndexScalarQuantizer_8cpp_source.html#l01404">IndexScalarQuantizer.cpp:1404</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a2bccf276565c4f80fed3d0c715c58816"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a2bccf276565c4f80fed3d0c715c58816">faiss::ScalarQuantizer::compute_codes</a></div><div class="ttdeci">void compute_codes(const float *x, uint8_t *codes, size_t n) const </div><div class="ttdoc">same as compute_code for several vectors </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l00943">IndexScalarQuantizer.cpp:943</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer_html_ad18c347d6f68f91feda5a54e4de93fab"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer_1_1DistanceComputer.html#ad18c347d6f68f91feda5a54e4de93fab">faiss::ScalarQuantizer::DistanceComputer::compute_code_distance</a></div><div class="ttdeci">virtual float compute_code_distance(const uint8_t *code1, const uint8_t *code2) const =0</div><div class="ttdoc">code-to-code distance computation </div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a1201dbd1611fa5c10782ade5d0e4952ea1650389e3efa052ff60177d502328a2c"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a1201dbd1611fa5c10782ade5d0e4952ea1650389e3efa052ff60177d502328a2c">faiss::ScalarQuantizer::QT_8bit</a></div><div class="ttdoc">8 bits per component </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00035">IndexScalarQuantizer.h:35</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html"><div class="ttname"><a href="structfaiss_1_1Index.html">faiss::Index</a></div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00062">Index.h:62</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_a06e6935b75f0b209f65fffa1c9e1477c"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#a06e6935b75f0b209f65fffa1c9e1477c">faiss::IndexScalarQuantizer::reconstruct_n</a></div><div class="ttdeci">void reconstruct_n(idx_t i0, idx_t ni, float *recons) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01093">IndexScalarQuantizer.cpp:1093</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexScalarQuantizer_html_a8fb8680f64465d643d96119da58099f3"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#a8fb8680f64465d643d96119da58099f3">faiss::IndexScalarQuantizer::reconstruct</a></div><div class="ttdeci">void reconstruct(idx_t key, float *recons) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01103">IndexScalarQuantizer.cpp:1103</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a867ad0000e4ccfd40bbb1e01e7882d06aa52f2f14616c61c04baf6323d43588fd"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a867ad0000e4ccfd40bbb1e01e7882d06aa52f2f14616c61c04baf6323d43588fd">faiss::ScalarQuantizer::RS_minmax</a></div><div class="ttdoc">[min - rs*(max-min), max + rs*(max-min)] </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00050">IndexScalarQuantizer.h:50</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_a30b411b10780a74079bbbfaff678c86f"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#a30b411b10780a74079bbbfaff678c86f">faiss::ScalarQuantizer::trained</a></div><div class="ttdeci">std::vector&lt; float &gt; trained</div><div class="ttdoc">trained values (including the range) </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00066">IndexScalarQuantizer.h:66</a></div></div>
<div class="ttc" id="structfaiss_1_1Level1Quantizer_html_a3cf99e2ee92b8558a066f821efab95d5"><div class="ttname"><a href="structfaiss_1_1Level1Quantizer.html#a3cf99e2ee92b8558a066f821efab95d5">faiss::Level1Quantizer::quantizer</a></div><div class="ttdeci">Index * quantizer</div><div class="ttdoc">quantizer that maps vectors to inverted lists </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_1IndexScalarQuantizer_html_a300647e9cdac9acd160f2c55c610056b"><div class="ttname"><a href="structfaiss_1_1IndexScalarQuantizer.html#a300647e9cdac9acd160f2c55c610056b">faiss::IndexScalarQuantizer::train</a></div><div class="ttdeci">void train(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8cpp_source.html#l01011">IndexScalarQuantizer.cpp:1011</a></div></div>
<div class="ttc" id="structfaiss_1_1ScalarQuantizer_html_acd88af01ad1d06560cecc30bc38aef49"><div class="ttname"><a href="structfaiss_1_1ScalarQuantizer.html#acd88af01ad1d06560cecc30bc38aef49">faiss::ScalarQuantizer::d</a></div><div class="ttdeci">size_t d</div><div class="ttdoc">dimension of input vectors </div><div class="ttdef"><b>Definition:</b> <a href="IndexScalarQuantizer_8h_source.html#l00060">IndexScalarQuantizer.h:60</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#l00034">IndexIVF.h:34</a></div></div>
<div class="ttc" id="namespacefaiss_html_afd12191c638da74760ff397cf319752c"><div class="ttname"><a href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">faiss::MetricType</a></div><div class="ttdeci">MetricType</div><div class="ttdoc">Some algorithms support both an inner product version and a L2 search version. </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00045">Index.h:45</a></div></div>
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