• matthijs's avatar
    Synchronization with FB version 2017-06-21 · 784e2fac
    matthijs authored
    * moved most FAISS_ASSERT calls to C++ exceptions, and adjusted
      memory allocation to avoid mem leaks
    
    * added an IndexIVFScalarQuantizer type that offers an
      intermediate compression between IVFFlat and IVFPQ
    
    * support removal of indices in IndexIDMap / IndexFlat combination
    
    * various fixes in GPU code
    784e2fac
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<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 CC-by-NC 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">// from Nvidia cuDNN library samples; modified to compile within faiss</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">#pragma once</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> * Copyright 1993-2014 NVIDIA Corporation.  All rights reserved.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * NOTICE TO LICENSEE:</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * This source code and/or documentation (&quot;Licensed Deliverables&quot;) are</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> * subject to NVIDIA intellectual property rights under U.S. and</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * international Copyright laws.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> * These Licensed Deliverables contained herein is PROPRIETARY and</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> * the contrary in the License Agreement, reproduction or disclosure</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment"> * 1995), consisting of &quot;commercial computer software&quot; and &quot;commercial</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment"> * computer software documentation&quot; as such terms are used in 48</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"> * Users Notice.</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">// Conversion from/to 16-bit floating point (half-precision).</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="preprocessor">#define HLF_EPSILON 4.887581E-04</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span>__align__(2) {</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;   <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> x;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;} half1;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;half1 cpu_float2half_rn(<span class="keywordtype">float</span> f);</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keywordtype">float</span> cpu_half2float(half1 h);</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="keyword">static</span> __inline__ __device__ __host__ half1 habs(half1 h)</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;{</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    h.x &amp;= 0x7fffU;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keywordflow">return</span> h;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;}</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="keyword">static</span> __inline__ __device__ __host__ half1 hneg(half1 h)</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;{</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    h.x ^= 0x8000U;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keywordflow">return</span> h;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;}</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="keyword">static</span> __inline__ __device__ __host__ <span class="keywordtype">int</span> ishnan(half1 h)</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;{</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="comment">// When input is NaN, exponent is all ones and mantissa is non-zero.</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keywordflow">return</span> (h.x &amp; 0x7c00U) == 0x7c00U &amp;&amp; (h.x &amp; 0x03ffU) != 0;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;}</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="keyword">static</span> __inline__ __device__ __host__ <span class="keywordtype">int</span> ishinf(half1 h)</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;    <span class="comment">// When input is +/- inf, exponent is all ones and mantissa is zero.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    <span class="keywordflow">return</span> (h.x &amp; 0x7c00U) == 0x7c00U &amp;&amp; (h.x &amp; 0x03ffU) == 0;</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;<span class="keyword">static</span> __inline__ __device__ __host__ <span class="keywordtype">int</span> ishequ(half1 x, half1 y)</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">  102</span>&#160;    <span class="keywordflow">return</span> ishnan(x) == 0 &amp;&amp; ishnan(y) == 0 &amp;&amp; x.x == y.x;</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;}</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="keyword">static</span> __inline__ __device__ __host__ half1 hzero()</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;{</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    half1 ret;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    ret.x = 0x0000U;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;}</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="keyword">static</span> __inline__ __device__ __host__ half1 hone()</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;{</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    half1 ret;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    ret.x = 0x3c00U;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;}</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;} } <span class="comment">// namespace</span></div>
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