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2017-02-23 06:26:44 +08:00
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2019-05-28 22:17:22 +08:00
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2017-02-23 06:26:44 +08:00
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2017-06-21 21:54:28 +08:00
< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > /**< / span > < / div >
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< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > * Copyright (c) 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 >   < span class = "comment" > /*< / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "comment" > * A few utilitary functions for similarity search:< / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "comment" > * - random generators< / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "comment" > * - optimized exhaustive distance and knn search functions< / span > < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "comment" > * - some functions reimplemented from torch for speed< / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "preprocessor" > #ifndef FAISS_utils_h< / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "preprocessor" > < / span > < span class = "preprocessor" > #define FAISS_utils_h< / span > < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "preprocessor" > #include < random> < / 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 = "preprocessor" > #include < stdint.h> < / span > < / 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 >   < span class = "preprocessor" > #include " Heap.h" < / span > < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < / div >
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< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < / div >
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< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < span class = "keyword" > namespace < / span > faiss {< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < / div >
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< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < / div >
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< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "comment" > /**************************************************< / span > < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "comment" > * Get some stats about the system< / span > < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "comment" > **************************************************/< / span > < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "comment" > /// ms elapsed since some arbitrary epoch< / span > < / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > double< / span > < a class = "code" href = "namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb" > getmillisecs< / a > ();< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "comment" > /// get current RSS usage in kB< / span > < / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > size_t< / span > < a class = "code" href = "namespacefaiss.html#aa3af5769b0b649f112332a874c64d361" > get_mem_usage_kb< / a > ();< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < / div >
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< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < / div >
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< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "comment" > /**************************************************< / span > < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "comment" > * Random data generation functions< / span > < / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < span class = "comment" > **************************************************/< / span > < / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < span class = "comment" > /// random generator that can be used in multithreaded contexts< / span > < / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1RandomGenerator.html" > 47< / a > < / span >   < span class = "comment" > < / span > < span class = "keyword" > struct < / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html" > RandomGenerator< / a > {< / 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 >   std::mt19937 mt;< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "comment" > /// random positive integer< / span > < / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > int< / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420" > rand_int< / a > ();< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "comment" > /// random long< / span > < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > long< / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html#acbceaa8b017793ca4f8d90e644b0d7f4" > rand_long< / a > ();< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "comment" > /// generate random integer between 0 and max-1< / span > < / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > int< / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420" > rand_int< / a > (< span class = "keywordtype" > int< / span > max);< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "comment" > /// between 0 and 1< / span > < / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > float< / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html#ac82a433d7bfa56d750907ba5cf74aed7" > rand_float< / a > ();< / 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 >   < span class = "keywordtype" > double< / span > rand_double ();< / 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 >   < span class = "keyword" > explicit< / span > < a class = "code" href = "structfaiss_1_1RandomGenerator.html" > RandomGenerator< / a > (< span class = "keywordtype" > long< / span > seed = 1234);< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   };< / 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 = "comment" > /* Generate an array of uniform random floats / multi-threaded implementation */< / span > < / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < span class = "keywordtype" > void< / span > float_rand (< span class = "keywordtype" > float< / span > * x, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > long< / span > seed);< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordtype" > void< / span > float_randn (< span class = "keywordtype" > float< / span > * x, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > long< / span > seed);< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < span class = "keywordtype" > void< / span > long_rand (< span class = "keywordtype" > long< / span > * x, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > long< / span > seed);< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keywordtype" > void< / span > byte_rand (uint8_t * x, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > long< / span > seed);< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "comment" > /* random permutation */< / span > < / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keywordtype" > void< / span > rand_perm (< span class = "keywordtype" > int< / span > * perm, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > long< / span > seed);< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < / div >
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< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < / div >
2018-12-20 00:48:35 +08:00
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < / div >
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< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < span class = "comment" > /*********************************************************< / span > < / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   < span class = "comment" > * Optimized distance/norm/inner prod computations< / span > < / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "comment" > *********************************************************/< / span > < / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   < span class = "comment" > /// Squared L2 distance between two vectors< / span > < / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > float< / span > < a class = "code" href = "namespacefaiss.html#a7466bd32de31640860393a701eaac5ad" > fvec_L2sqr< / a > (< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   < span class = "keywordtype" > size_t< / span > d);< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   < span class = "comment" > /* SSE-implementation of inner product and L2 distance */< / span > < / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < span class = "keywordtype" > float< / span > fvec_inner_product (< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordtype" > size_t< / span > d);< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   < / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "comment" > /// a balanced assignment has a IF of 1< / span > < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > double< / span > < a class = "code" href = "namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714" > imbalance_factor< / a > (< span class = "keywordtype" > int< / span > n, < span class = "keywordtype" > int< / span > k, < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > *assign);< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < span class = "comment" > /// same, takes a histogram as input< / span > < / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > double< / span > < a class = "code" href = "namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714" > imbalance_factor< / a > (< span class = "keywordtype" > int< / span > k, < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > *hist);< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "comment" > /** Compute pairwise distances between sets of vectors< / span > < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "comment" > * @param d dimension of the vectors< / span > < / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < span class = "comment" > * @param nq nb of query vectors< / span > < / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "comment" > * @param nb nb of database vectors< / span > < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < span class = "comment" > * @param xq query vectors (size nq * d)< / span > < / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "comment" > * @param xb database vectros (size nb * d)< / span > < / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < span class = "comment" > * @param dis output distances (size nq * nb)< / span > < / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < span class = "comment" > * @param ldq,ldb, ldd strides for the matrices< / span > < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57" > pairwise_L2sqr< / a > (< span class = "keywordtype" > long< / span > d,< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "keywordtype" > long< / span > nq, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xq,< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < span class = "keywordtype" > long< / span > nb, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xb,< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < span class = "keywordtype" > float< / span > *dis,< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "keywordtype" > long< / span > ldq = -1, < span class = "keywordtype" > long< / span > ldb = -1, < span class = "keywordtype" > long< / span > ldd = -1);< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   < / div >
2018-12-20 00:48:35 +08:00
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < span class = "comment" > /* compute the inner product between nx vectors x and one y */< / span > < / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   < span class = "keywordtype" > void< / span > fvec_inner_products_ny (< / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < span class = "keywordtype" > float< / span > * ip, < span class = "comment" > /* output inner product */< / span > < / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > ny);< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   < span class = "comment" > /* compute ny square L2 distance bewteen x and a set of contiguous y vectors */< / span > < / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   < span class = "keywordtype" > void< / span > fvec_L2sqr_ny (< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   < span class = "keywordtype" > float< / span > * __restrict dis,< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > ny);< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   < / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   < span class = "comment" > /** squared norm of a vector */< / span > < / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < span class = "keywordtype" > float< / span > < a class = "code" href = "namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84" > fvec_norm_L2sqr< / a > (< span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   < span class = "keywordtype" > size_t< / span > d);< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   < span class = "comment" > /** compute the L2 norms for a set of vectors< / span > < / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   < span class = "comment" > * @param ip output norms, size nx< / span > < / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   < span class = "comment" > * @param x set of vectors, size nx * d< / span > < / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   < span class = "keywordtype" > void< / span > fvec_norms_L2 (< span class = "keywordtype" > float< / span > * ip, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x, < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx);< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00146" > < / a > < span class = "lineno" > 146< / span >   < span class = "comment" > /// same as fvec_norms_L2, but computes square norms< / span > < / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > void< / span > fvec_norms_L2sqr (< span class = "keywordtype" > float< / span > * ip, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x, < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx);< / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   < / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   < span class = "comment" > /* L2-renormalize a set of vector. Nothing done if the vector is 0-normed */< / span > < / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < span class = "keywordtype" > void< / span > fvec_renorm_L2 (< span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > float< / span > * x);< / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   < / div >
2018-12-20 00:48:35 +08:00
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   < span class = "comment" > /* This function exists because the Torch counterpart is extremly slow< / span > < / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   < span class = "comment" > (not multi-threaded + unexpected overhead even in single thread).< / span > < / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   < span class = "comment" > It is here to implement the usual property |x-y|^2=|x|^2+|y|^2-2< x|y> */< / span > < / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   < span class = "keywordtype" > void< / span > inner_product_to_L2sqr (< span class = "keywordtype" > float< / span > * __restrict dis,< / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * nr1,< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * nr2,< / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   < span class = "keywordtype" > size_t< / span > n1, < span class = "keywordtype" > size_t< / span > n2);< / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   < / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < span class = "comment" > /***************************************************************************< / span > < / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   < span class = "comment" > * Compute a subset of distances< / span > < / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   < span class = "comment" > ***************************************************************************/< / span > < / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   < / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   < span class = "comment" > /* compute the inner product between x and a subset y of ny vectors,< / span > < / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < span class = "comment" > whose indices are given by idy. */< / span > < / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   < span class = "keywordtype" > void< / span > fvec_inner_products_by_idx (< / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   < span class = "keywordtype" > float< / span > * __restrict ip,< / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > * __restrict ids,< / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny);< / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < span class = "comment" > /* same but for a subset in y indexed by idsy (ny vectors in total) */< / span > < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "keywordtype" > void< / span > fvec_L2sqr_by_idx (< / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < span class = "keywordtype" > float< / span > * __restrict dis,< / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > * __restrict ids, < span class = "comment" > /* ids of y vecs */< / span > < / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny);< / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   < / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   < span class = "comment" > /***************************************************************************< / span > < / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   < span class = "comment" > * KNN functions< / span > < / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   < span class = "comment" > ***************************************************************************/< / span > < / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   < span class = "comment" > // threshold on nx above which we switch to BLAS to compute distances< / span > < / div >
< div class = "line" > < a name = "l00187" > < / a > < span class = "lineno" > 187< / span >   < span class = "keyword" > extern< / span > < span class = "keywordtype" > int< / span > distance_compute_blas_threshold;< / div >
< div class = "line" > < a name = "l00188" > < / a > < span class = "lineno" > 188< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   < span class = "comment" > /** Return the k nearest neighors of each of the nx vectors x among the ny< / span > < / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   < span class = "comment" > * vector y, w.r.t to max inner product< / span > < / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   < span class = "comment" > * @param x query vectors, size nx * d< / span > < / div >
< div class = "line" > < a name = "l00193" > < / a > < span class = "lineno" > 193< / span >   < span class = "comment" > * @param y database vectors, size ny * d< / span > < / div >
< div class = "line" > < a name = "l00194" > < / a > < span class = "lineno" > 194< / span >   < span class = "comment" > * @param res result array, which also provides k. Sorted on output< / span > < / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a880c7318971f866267a86945aaa61b17" > knn_inner_product< / a > (< / div >
< div class = "line" > < a name = "l00197" > < / a > < span class = "lineno" > 197< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00198" > < / a > < span class = "lineno" > 198< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00199" > < / a > < span class = "lineno" > 199< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00200" > < / a > < span class = "lineno" > 200< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > float_minheap_array_t< / a > * res);< / div >
< div class = "line" > < a name = "l00201" > < / a > < span class = "lineno" > 201< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00202" > < / a > < span class = "lineno" > 202< / span >   < span class = "comment" > /** Same as knn_inner_product, for the L2 distance */< / span > < / div >
< div class = "line" > < a name = "l00203" > < / a > < span class = "lineno" > 203< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a2f803e3d3b07cfab63699c89de161237" > knn_L2sqr< / a > (< / div >
< div class = "line" > < a name = "l00204" > < / a > < span class = "lineno" > 204< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00205" > < / a > < span class = "lineno" > 205< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00206" > < / a > < span class = "lineno" > 206< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00207" > < / a > < span class = "lineno" > 207< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > float_maxheap_array_t< / a > * res);< / div >
< div class = "line" > < a name = "l00208" > < / a > < span class = "lineno" > 208< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00209" > < / a > < span class = "lineno" > 209< / span >   < span class = "comment" > /** same as knn_L2sqr, but base_shift[bno] is subtracted to all< / span > < / div >
< div class = "line" > < a name = "l00210" > < / a > < span class = "lineno" > 210< / span >   < span class = "comment" > * computed distances.< / span > < / div >
< div class = "line" > < a name = "l00211" > < / a > < span class = "lineno" > 211< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00212" > < / a > < span class = "lineno" > 212< / span >   < span class = "comment" > * @param base_shift size ny< / span > < / div >
< div class = "line" > < a name = "l00213" > < / a > < span class = "lineno" > 213< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00214" > < / a > < span class = "lineno" > 214< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a5eb1701e46123827966f2a56da893d1d" > knn_L2sqr_base_shift< / a > (< / div >
< div class = "line" > < a name = "l00215" > < / a > < span class = "lineno" > 215< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00216" > < / a > < span class = "lineno" > 216< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00217" > < / a > < span class = "lineno" > 217< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00218" > < / a > < span class = "lineno" > 218< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > float_maxheap_array_t< / a > * res,< / div >
< div class = "line" > < a name = "l00219" > < / a > < span class = "lineno" > 219< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *base_shift);< / div >
< div class = "line" > < a name = "l00220" > < / a > < span class = "lineno" > 220< / span >   < / div >
< div class = "line" > < a name = "l00221" > < / a > < span class = "lineno" > 221< / span >   < span class = "comment" > /* Find the nearest neighbors for nx queries in a set of ny vectors< / span > < / div >
< div class = "line" > < a name = "l00222" > < / a > < span class = "lineno" > 222< / span >   < span class = "comment" > * indexed by ids. May be useful for re-ranking a pre-selected vector list< / span > < / div >
< div class = "line" > < a name = "l00223" > < / a > < span class = "lineno" > 223< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00224" > < / a > < span class = "lineno" > 224< / span >   < span class = "keywordtype" > void< / span > knn_inner_products_by_idx (< / div >
< div class = "line" > < a name = "l00225" > < / a > < span class = "lineno" > 225< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00226" > < / a > < span class = "lineno" > 226< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00227" > < / a > < span class = "lineno" > 227< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > * ids,< / div >
< div class = "line" > < a name = "l00228" > < / a > < span class = "lineno" > 228< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00229" > < / a > < span class = "lineno" > 229< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > float_minheap_array_t< / a > * res);< / div >
< div class = "line" > < a name = "l00230" > < / a > < span class = "lineno" > 230< / span >   < / div >
< div class = "line" > < a name = "l00231" > < / a > < span class = "lineno" > 231< / span >   < span class = "keywordtype" > void< / span > knn_L2sqr_by_idx (< span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00232" > < / a > < span class = "lineno" > 232< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00233" > < / a > < span class = "lineno" > 233< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > * __restrict ids,< / div >
< div class = "line" > < a name = "l00234" > < / a > < span class = "lineno" > 234< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00235" > < / a > < span class = "lineno" > 235< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > float_maxheap_array_t< / a > * res);< / div >
< div class = "line" > < a name = "l00236" > < / a > < span class = "lineno" > 236< / span >   < / div >
< div class = "line" > < a name = "l00237" > < / a > < span class = "lineno" > 237< / span >   < span class = "comment" > /***************************************************************************< / span > < / div >
< div class = "line" > < a name = "l00238" > < / a > < span class = "lineno" > 238< / span >   < span class = "comment" > * Range search< / span > < / div >
< div class = "line" > < a name = "l00239" > < / a > < span class = "lineno" > 239< / span >   < span class = "comment" > ***************************************************************************/< / span > < / div >
< div class = "line" > < a name = "l00240" > < / a > < span class = "lineno" > 240< / span >   < / div >
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< div class = "line" > < a name = "l00241" > < / a > < span class = "lineno" > 241< / span >   < / div >
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< div class = "line" > < a name = "l00242" > < / a > < span class = "lineno" > 242< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00243" > < / a > < span class = "lineno" > 243< / span >   < span class = "comment" > /// Forward declaration, see AuxIndexStructures.h< / span > < / div >
< div class = "line" > < a name = "l00244" > < / a > < span class = "lineno" > 244< / span >   < span class = "comment" > < / span > < span class = "keyword" > struct < / span > < a class = "code" href = "structfaiss_1_1RangeSearchResult.html" > RangeSearchResult< / a > ;< / div >
< div class = "line" > < a name = "l00245" > < / a > < span class = "lineno" > 245< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00246" > < / a > < span class = "lineno" > 246< / span >   < span class = "comment" > /** Return the k nearest neighors of each of the nx vectors x among the ny< / span > < / div >
< div class = "line" > < a name = "l00247" > < / a > < span class = "lineno" > 247< / span >   < span class = "comment" > * vector y, w.r.t to max inner product< / span > < / div >
< div class = "line" > < a name = "l00248" > < / a > < span class = "lineno" > 248< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00249" > < / a > < span class = "lineno" > 249< / span >   < span class = "comment" > * @param x query vectors, size nx * d< / span > < / div >
< div class = "line" > < a name = "l00250" > < / a > < span class = "lineno" > 250< / span >   < span class = "comment" > * @param y database vectors, size ny * d< / span > < / div >
< div class = "line" > < a name = "l00251" > < / a > < span class = "lineno" > 251< / span >   < span class = "comment" > * @param radius search radius around the x vectors< / span > < / div >
< div class = "line" > < a name = "l00252" > < / a > < span class = "lineno" > 252< / span >   < span class = "comment" > * @param result result structure< / span > < / div >
< div class = "line" > < a name = "l00253" > < / a > < span class = "lineno" > 253< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00254" > < / a > < span class = "lineno" > 254< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a1faa7bd079c9b1addf3058ddf882a000" > range_search_L2sqr< / a > (< / div >
< div class = "line" > < a name = "l00255" > < / a > < span class = "lineno" > 255< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00256" > < / a > < span class = "lineno" > 256< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00257" > < / a > < span class = "lineno" > 257< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00258" > < / a > < span class = "lineno" > 258< / span >   < span class = "keywordtype" > float< / span > radius,< / div >
< div class = "line" > < a name = "l00259" > < / a > < span class = "lineno" > 259< / span >   < a class = "code" href = "structfaiss_1_1RangeSearchResult.html" > RangeSearchResult< / a > *result);< / div >
< div class = "line" > < a name = "l00260" > < / a > < span class = "lineno" > 260< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00261" > < / a > < span class = "lineno" > 261< / span >   < span class = "comment" > /// same as range_search_L2sqr for the inner product similarity< / span > < / div >
< div class = "line" > < a name = "l00262" > < / a > < span class = "lineno" > 262< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#ab29d725b808df6f142b80f21aa45e507" > range_search_inner_product< / a > (< / div >
< div class = "line" > < a name = "l00263" > < / a > < span class = "lineno" > 263< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00264" > < / a > < span class = "lineno" > 264< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * y,< / div >
< div class = "line" > < a name = "l00265" > < / a > < span class = "lineno" > 265< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nx, < span class = "keywordtype" > size_t< / span > ny,< / div >
< div class = "line" > < a name = "l00266" > < / a > < span class = "lineno" > 266< / span >   < span class = "keywordtype" > float< / span > radius,< / div >
< div class = "line" > < a name = "l00267" > < / a > < span class = "lineno" > 267< / span >   < a class = "code" href = "structfaiss_1_1RangeSearchResult.html" > RangeSearchResult< / a > *result);< / div >
< div class = "line" > < a name = "l00268" > < / a > < span class = "lineno" > 268< / span >   < / div >
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< div class = "line" > < a name = "l00269" > < / a > < span class = "lineno" > 269< / span >   < / div >
< div class = "line" > < a name = "l00270" > < / a > < span class = "lineno" > 270< / span >   < / div >
< div class = "line" > < a name = "l00271" > < / a > < span class = "lineno" > 271< / span >   < / div >
< div class = "line" > < a name = "l00272" > < / a > < span class = "lineno" > 272< / span >   < / div >
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< div class = "line" > < a name = "l00273" > < / a > < span class = "lineno" > 273< / span >   < span class = "comment" > /***************************************************************************< / span > < / div >
< div class = "line" > < a name = "l00274" > < / a > < span class = "lineno" > 274< / span >   < span class = "comment" > * Misc matrix and vector manipulation functions< / span > < / div >
< div class = "line" > < a name = "l00275" > < / a > < span class = "lineno" > 275< / span >   < span class = "comment" > ***************************************************************************/< / span > < / 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 >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00278" > < / a > < span class = "lineno" > 278< / span >   < span class = "comment" > /** compute c := a + bf * b for a, b and c tables< / span > < / div >
< div class = "line" > < a name = "l00279" > < / a > < span class = "lineno" > 279< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00280" > < / a > < span class = "lineno" > 280< / span >   < span class = "comment" > * @param n size of the tables< / span > < / div >
< div class = "line" > < a name = "l00281" > < / a > < span class = "lineno" > 281< / span >   < span class = "comment" > * @param a size n< / span > < / div >
< div class = "line" > < a name = "l00282" > < / a > < span class = "lineno" > 282< / span >   < span class = "comment" > * @param b size n< / span > < / div >
< div class = "line" > < a name = "l00283" > < / a > < span class = "lineno" > 283< / span >   < span class = "comment" > * @param c restult table, size n< / span > < / div >
< div class = "line" > < a name = "l00284" > < / a > < span class = "lineno" > 284< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00285" > < / a > < span class = "lineno" > 285< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847" > fvec_madd< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *a,< / div >
< div class = "line" > < a name = "l00286" > < / a > < span class = "lineno" > 286< / span >   < span class = "keywordtype" > float< / span > bf, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *b, < span class = "keywordtype" > float< / span > *c);< / div >
< div class = "line" > < a name = "l00287" > < / a > < span class = "lineno" > 287< / span >   < / div >
< div class = "line" > < a name = "l00288" > < / a > < span class = "lineno" > 288< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00289" > < / a > < span class = "lineno" > 289< / span >   < span class = "comment" > /** same as fvec_madd, also return index of the min of the result table< / span > < / div >
< div class = "line" > < a name = "l00290" > < / a > < span class = "lineno" > 290< / span >   < span class = "comment" > * @return index of the min of table c< / span > < / div >
< div class = "line" > < a name = "l00291" > < / a > < span class = "lineno" > 291< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00292" > < / a > < span class = "lineno" > 292< / span >   < span class = "keywordtype" > int< / span > < a class = "code" href = "namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a" > fvec_madd_and_argmin< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *a,< / div >
< div class = "line" > < a name = "l00293" > < / a > < span class = "lineno" > 293< / span >   < span class = "keywordtype" > float< / span > bf, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *b, < span class = "keywordtype" > float< / span > *c);< / div >
< div class = "line" > < a name = "l00294" > < / a > < span class = "lineno" > 294< / span >   < / div >
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< div class = "line" > < a name = "l00295" > < / a > < span class = "lineno" > 295< / span >   < / div >
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< div class = "line" > < a name = "l00296" > < / a > < span class = "lineno" > 296< / span >   < span class = "comment" > /* perform a reflection (not an efficient implementation, just for test ) */< / span > < / div >
< div class = "line" > < a name = "l00297" > < / a > < span class = "lineno" > 297< / span >   < span class = "keywordtype" > void< / span > reflection (< span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * u, < span class = "keywordtype" > float< / span > * x, < span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > nu);< / 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 >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00300" > < / a > < span class = "lineno" > 300< / span >   < span class = "comment" > /** For k-means: update stage.< / span > < / div >
< div class = "line" > < a name = "l00301" > < / a > < span class = "lineno" > 301< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00302" > < / a > < span class = "lineno" > 302< / span >   < span class = "comment" > * @param x training vectors, size n * d< / span > < / div >
< div class = "line" > < a name = "l00303" > < / a > < span class = "lineno" > 303< / span >   < span class = "comment" > * @param centroids centroid vectors, size k * d< / span > < / div >
< div class = "line" > < a name = "l00304" > < / a > < span class = "lineno" > 304< / span >   < span class = "comment" > * @param assign nearest centroid for each training vector, size n< / span > < / div >
< div class = "line" > < a name = "l00305" > < / a > < span class = "lineno" > 305< / span >   < span class = "comment" > * @param k_frozen do not update the k_frozen first centroids< / span > < / div >
< div class = "line" > < a name = "l00306" > < / a > < span class = "lineno" > 306< / span >   < span class = "comment" > * @return nb of spliting operations to fight empty clusters< / span > < / div >
< div class = "line" > < a name = "l00307" > < / a > < span class = "lineno" > 307< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00308" > < / a > < span class = "lineno" > 308< / span >   < span class = "keywordtype" > int< / span > < a class = "code" href = "namespacefaiss.html#aa2c6a9e87a64bba8e8014e14f70bde21" > km_update_centroids< / a > (< / div >
< div class = "line" > < a name = "l00309" > < / a > < span class = "lineno" > 309< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * x,< / div >
< div class = "line" > < a name = "l00310" > < / a > < span class = "lineno" > 310< / span >   < span class = "keywordtype" > float< / span > * centroids,< / div >
< div class = "line" > < a name = "l00311" > < / a > < span class = "lineno" > 311< / span >   < span class = "keywordtype" > long< / span > * assign,< / div >
< div class = "line" > < a name = "l00312" > < / a > < span class = "lineno" > 312< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > k, < span class = "keywordtype" > size_t< / span > n,< / div >
< div class = "line" > < a name = "l00313" > < / a > < span class = "lineno" > 313< / span >   < span class = "keywordtype" > size_t< / span > k_frozen);< / div >
< div class = "line" > < a name = "l00314" > < / a > < span class = "lineno" > 314< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00315" > < / a > < span class = "lineno" > 315< / span >   < span class = "comment" > /** compute the Q of the QR decomposition for m > n< / span > < / div >
< div class = "line" > < a name = "l00316" > < / a > < span class = "lineno" > 316< / span >   < span class = "comment" > * @param a size n * m: input matrix and output Q< / span > < / div >
< div class = "line" > < a name = "l00317" > < / a > < span class = "lineno" > 317< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00318" > < / a > < span class = "lineno" > 318< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#afb68fe89ad5e948974da1b70d7b4157c" > matrix_qr< / a > (< span class = "keywordtype" > int< / span > m, < span class = "keywordtype" > int< / span > n, < span class = "keywordtype" > float< / span > *a);< / div >
< div class = "line" > < a name = "l00319" > < / a > < span class = "lineno" > 319< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00320" > < / a > < span class = "lineno" > 320< / span >   < span class = "comment" > /** distances are supposed to be sorted. Sorts indices with same distance*/< / span > < / div >
< div class = "line" > < a name = "l00321" > < / a > < span class = "lineno" > 321< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#ae0ee1b6fbd3d6da0f1a3550a780ca24c" > ranklist_handle_ties< / a > (< span class = "keywordtype" > int< / span > k, < span class = "keywordtype" > long< / span > *idx, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *dis);< / div >
< div class = "line" > < a name = "l00322" > < / a > < span class = "lineno" > 322< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00323" > < / a > < span class = "lineno" > 323< / span >   < span class = "comment" > /** count the number of comon elements between v1 and v2< / span > < / div >
< div class = "line" > < a name = "l00324" > < / a > < span class = "lineno" > 324< / span >   < span class = "comment" > * algorithm = sorting + bissection to avoid double-counting duplicates< / span > < / div >
< div class = "line" > < a name = "l00325" > < / a > < span class = "lineno" > 325< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00326" > < / a > < span class = "lineno" > 326< / span >   < span class = "keywordtype" > size_t< / span > < a class = "code" href = "namespacefaiss.html#a8dbc652ba48d41f126b8815004899448" > ranklist_intersection_size< / a > (< span class = "keywordtype" > size_t< / span > k1, < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > *v1,< / div >
< div class = "line" > < a name = "l00327" > < / a > < span class = "lineno" > 327< / span >   < span class = "keywordtype" > size_t< / span > k2, < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > *v2);< / div >
< div class = "line" > < a name = "l00328" > < / a > < span class = "lineno" > 328< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00329" > < / a > < span class = "lineno" > 329< / span >   < span class = "comment" > /** merge a result table into another one< / span > < / div >
< div class = "line" > < a name = "l00330" > < / a > < span class = "lineno" > 330< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00331" > < / a > < span class = "lineno" > 331< / span >   < span class = "comment" > * @param I0, D0 first result table, size (n, k)< / span > < / div >
< div class = "line" > < a name = "l00332" > < / a > < span class = "lineno" > 332< / span >   < span class = "comment" > * @param I1, D1 second result table, size (n, k)< / span > < / div >
< div class = "line" > < a name = "l00333" > < / a > < span class = "lineno" > 333< / span >   < span class = "comment" > * @param keep_min if true, keep min values, otherwise keep max< / span > < / div >
< div class = "line" > < a name = "l00334" > < / a > < span class = "lineno" > 334< / span >   < span class = "comment" > * @param translation add this value to all I1' s indexes< / span > < / div >
< div class = "line" > < a name = "l00335" > < / a > < span class = "lineno" > 335< / span >   < span class = "comment" > * @return nb of values that were taken from the second table< / span > < / div >
< div class = "line" > < a name = "l00336" > < / a > < span class = "lineno" > 336< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00337" > < / a > < span class = "lineno" > 337< / span >   < span class = "keywordtype" > size_t< / span > < a class = "code" href = "namespacefaiss.html#afb7b33f6892678ba79aaf5e71777837c" > merge_result_table_with< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > size_t< / span > k,< / div >
< div class = "line" > < a name = "l00338" > < / a > < span class = "lineno" > 338< / span >   < span class = "keywordtype" > long< / span > *I0, < span class = "keywordtype" > float< / span > *D0,< / div >
< div class = "line" > < a name = "l00339" > < / a > < span class = "lineno" > 339< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > long< / span > *I1, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *D1,< / div >
< div class = "line" > < a name = "l00340" > < / a > < span class = "lineno" > 340< / span >   < span class = "keywordtype" > bool< / span > keep_min = < span class = "keyword" > true< / span > ,< / div >
< div class = "line" > < a name = "l00341" > < / a > < span class = "lineno" > 341< / span >   < span class = "keywordtype" > long< / span > translation = 0);< / div >
< div class = "line" > < a name = "l00342" > < / a > < span class = "lineno" > 342< / span >   < / div >
2018-12-20 00:48:35 +08:00
< div class = "line" > < a name = "l00343" > < / a > < span class = "lineno" > 343< / span >   < / div >
< div class = "line" > < a name = "l00344" > < / a > < span class = "lineno" > 344< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00345" > < / a > < span class = "lineno" > 345< / span >   < span class = "keywordtype" > void< / span > fvec_argsort (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *vals,< / div >
< div class = "line" > < a name = "l00346" > < / a > < span class = "lineno" > 346< / span >   < span class = "keywordtype" > size_t< / span > *perm);< / div >
< div class = "line" > < a name = "l00347" > < / a > < span class = "lineno" > 347< / span >   < / div >
< div class = "line" > < a name = "l00348" > < / a > < span class = "lineno" > 348< / span >   < span class = "keywordtype" > void< / span > fvec_argsort_parallel (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *vals,< / div >
< div class = "line" > < a name = "l00349" > < / a > < span class = "lineno" > 349< / span >   < span class = "keywordtype" > size_t< / span > *perm);< / div >
< div class = "line" > < a name = "l00350" > < / a > < span class = "lineno" > 350< / span >   < / div >
< div class = "line" > < a name = "l00351" > < / a > < span class = "lineno" > 351< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00352" > < / a > < span class = "lineno" > 352< / span >   < span class = "comment" > /// compute histogram on v< / span > < / div >
< div class = "line" > < a name = "l00353" > < / a > < span class = "lineno" > 353< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > int< / span > < a class = "code" href = "namespacefaiss.html#a7bea462108bee98d8d5859b51ec4db8e" > ivec_hist< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > * v, < span class = "keywordtype" > int< / span > vmax, < span class = "keywordtype" > int< / span > *hist);< / div >
< div class = "line" > < a name = "l00354" > < / a > < span class = "lineno" > 354< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00355" > < / a > < span class = "lineno" > 355< / span >   < span class = "comment" > /** Compute histogram of bits on a code array< / span > < / div >
< div class = "line" > < a name = "l00356" > < / a > < span class = "lineno" > 356< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00357" > < / a > < span class = "lineno" > 357< / span >   < span class = "comment" > * @param codes size(n, nbits / 8)< / span > < / div >
< div class = "line" > < a name = "l00358" > < / a > < span class = "lineno" > 358< / span >   < span class = "comment" > * @param hist size(nbits): nb of 1s in the array of codes< / span > < / div >
< div class = "line" > < a name = "l00359" > < / a > < span class = "lineno" > 359< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00360" > < / a > < span class = "lineno" > 360< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#a154a47857ed321b9db91122770a16e09" > bincode_hist< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keywordtype" > size_t< / span > nbits, < span class = "keyword" > const< / span > uint8_t *codes, < span class = "keywordtype" > int< / span > *hist);< / div >
< div class = "line" > < a name = "l00361" > < / a > < span class = "lineno" > 361< / span >   < / div >
< div class = "line" > < a name = "l00362" > < / a > < span class = "lineno" > 362< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00363" > < / a > < span class = "lineno" > 363< / span >   < span class = "comment" > /// compute a checksum on a table.< / span > < / div >
< div class = "line" > < a name = "l00364" > < / a > < span class = "lineno" > 364< / span >   < span class = "comment" > < / span > < span class = "keywordtype" > size_t< / span > < a class = "code" href = "namespacefaiss.html#a4369329c9dbdfe23e3f35d09ba7b5c6e" > ivec_checksum< / a > (< span class = "keywordtype" > size_t< / span > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > *a);< / div >
< div class = "line" > < a name = "l00365" > < / a > < span class = "lineno" > 365< / span >   < / div >
< div class = "line" > < a name = "l00366" > < / a > < span class = "lineno" > 366< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00367" > < / a > < span class = "lineno" > 367< / span >   < span class = "comment" > /** random subsamples a set of vectors if there are too many of them< / span > < / div >
< div class = "line" > < a name = "l00368" > < / a > < span class = "lineno" > 368< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00369" > < / a > < span class = "lineno" > 369< / span >   < span class = "comment" > * @param d dimension of the vectors< / span > < / div >
< div class = "line" > < a name = "l00370" > < / a > < span class = "lineno" > 370< / span >   < span class = "comment" > * @param n on input: nb of input vectors, output: nb of output vectors< / span > < / div >
< div class = "line" > < a name = "l00371" > < / a > < span class = "lineno" > 371< / span >   < span class = "comment" > * @param nmax max nb of vectors to keep< / span > < / div >
< div class = "line" > < a name = "l00372" > < / a > < span class = "lineno" > 372< / span >   < span class = "comment" > * @param x input array, size *n-by-d< / span > < / div >
< div class = "line" > < a name = "l00373" > < / a > < span class = "lineno" > 373< / span >   < span class = "comment" > * @param seed random seed to use for sampling< / span > < / div >
< div class = "line" > < a name = "l00374" > < / a > < span class = "lineno" > 374< / span >   < span class = "comment" > * @return x or an array allocated with new [] with *n vectors< / span > < / div >
< div class = "line" > < a name = "l00375" > < / a > < span class = "lineno" > 375< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00376" > < / a > < span class = "lineno" > 376< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *< a class = "code" href = "namespacefaiss.html#a14884d253128c7af5891a65082ad7dc6" > fvecs_maybe_subsample< / a > (< / div >
< div class = "line" > < a name = "l00377" > < / a > < span class = "lineno" > 377< / span >   < span class = "keywordtype" > size_t< / span > d, < span class = "keywordtype" > size_t< / span > *n, < span class = "keywordtype" > size_t< / span > nmax, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *x,< / div >
< div class = "line" > < a name = "l00378" > < / a > < span class = "lineno" > 378< / span >   < span class = "keywordtype" > bool< / span > verbose = < span class = "keyword" > false< / span > , < span class = "keywordtype" > long< / span > seed = 1234);< / div >
< div class = "line" > < a name = "l00379" > < / a > < span class = "lineno" > 379< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00380" > < / a > < span class = "lineno" > 380< / span >   < span class = "comment" > /** Convert binary vector to +1/-1 valued float vector.< / span > < / div >
< div class = "line" > < a name = "l00381" > < / a > < span class = "lineno" > 381< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00382" > < / a > < span class = "lineno" > 382< / span >   < span class = "comment" > * @param d dimension of the vector (multiple of 8)< / span > < / div >
< div class = "line" > < a name = "l00383" > < / a > < span class = "lineno" > 383< / span >   < span class = "comment" > * @param x_in input binary vector (uint8_t table of size d / 8)< / span > < / div >
< div class = "line" > < a name = "l00384" > < / a > < span class = "lineno" > 384< / span >   < span class = "comment" > * @param x_out output float vector (float table of size d)< / span > < / div >
< div class = "line" > < a name = "l00385" > < / a > < span class = "lineno" > 385< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00386" > < / a > < span class = "lineno" > 386< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#ac8260e10cfeed08a4344b85845773e16" > binary_to_real< / a > (< span class = "keywordtype" > size_t< / span > d, < span class = "keyword" > const< / span > uint8_t *x_in, < span class = "keywordtype" > float< / span > *x_out);< / div >
< div class = "line" > < a name = "l00387" > < / a > < span class = "lineno" > 387< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00388" > < / a > < span class = "lineno" > 388< / span >   < span class = "comment" > /** Convert float vector to binary vector. Components > 0 are converted to 1,< / span > < / div >
< div class = "line" > < a name = "l00389" > < / a > < span class = "lineno" > 389< / span >   < span class = "comment" > * others to 0.< / span > < / div >
< div class = "line" > < a name = "l00390" > < / a > < span class = "lineno" > 390< / span >   < span class = "comment" > *< / span > < / div >
< div class = "line" > < a name = "l00391" > < / a > < span class = "lineno" > 391< / span >   < span class = "comment" > * @param d dimension of the vector (multiple of 8)< / span > < / div >
< div class = "line" > < a name = "l00392" > < / a > < span class = "lineno" > 392< / span >   < span class = "comment" > * @param x_in input float vector (float table of size d)< / span > < / div >
< div class = "line" > < a name = "l00393" > < / a > < span class = "lineno" > 393< / span >   < span class = "comment" > * @param x_out output binary vector (uint8_t table of size d / 8)< / span > < / div >
< div class = "line" > < a name = "l00394" > < / a > < span class = "lineno" > 394< / span >   < span class = "comment" > */< / span > < / div >
< div class = "line" > < a name = "l00395" > < / a > < span class = "lineno" > 395< / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "namespacefaiss.html#ab491c9e2f77a750c9f0324bfe00e3e57" > real_to_binary< / a > (< span class = "keywordtype" > size_t< / span > d, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *x_in, uint8_t *x_out);< / div >
< div class = "line" > < a name = "l00396" > < / a > < span class = "lineno" > 396< / span >   < / div >
< div class = "line" > < a name = "l00397" > < / a > < span class = "lineno" > 397< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00398" > < / a > < span class = "lineno" > 398< / span >   < span class = "comment" > /** A reasonable hashing function */< / span > < / div >
< div class = "line" > < a name = "l00399" > < / a > < span class = "lineno" > 399< / span >   uint64_t < a class = "code" href = "namespacefaiss.html#abefd45801bab63d2eb71005ad7a51d32" > hash_bytes< / a > (< span class = "keyword" > const< / span > uint8_t *bytes, < span class = "keywordtype" > long< / span > n);< / div >
< div class = "line" > < a name = "l00400" > < / a > < span class = "lineno" > 400< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00401" > < / a > < span class = "lineno" > 401< / span >   < span class = "comment" > /** Whether OpenMP annotations were respected. */< / span > < / div >
< div class = "line" > < a name = "l00402" > < / a > < span class = "lineno" > 402< / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "namespacefaiss.html#ad86caef545c6a7672422d7d34c03f446" > check_openmp< / a > ();< / div >
< div class = "line" > < a name = "l00403" > < / a > < span class = "lineno" > 403< / span >   < / div >
< div class = "line" > < a name = "l00404" > < / a > < span class = "lineno" > 404< / span >   } < span class = "comment" > // namspace faiss< / span > < / div >
< div class = "line" > < a name = "l00405" > < / a > < span class = "lineno" > 405< / span >   < / div >
< div class = "line" > < a name = "l00406" > < / a > < span class = "lineno" > 406< / span >   < / div >
< div class = "line" > < a name = "l00407" > < / a > < span class = "lineno" > 407< / span >   < span class = "preprocessor" > #endif < / span > < span class = "comment" > /* FAISS_utils_h */< / span > < span class = "preprocessor" > < / span > < / div >
< div class = "ttc" id = "structfaiss_1_1RandomGenerator_html" > < div class = "ttname" > < a href = "structfaiss_1_1RandomGenerator.html" > faiss::RandomGenerator< / a > < / div > < div class = "ttdoc" > random generator that can be used in multithreaded contexts < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8h_source.html#l00047" > utils.h:47< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_aa2c6a9e87a64bba8e8014e14f70bde21" > < div class = "ttname" > < a href = "namespacefaiss.html#aa2c6a9e87a64bba8e8014e14f70bde21" > faiss::km_update_centroids< / a > < / div > < div class = "ttdeci" > int km_update_centroids(const float *x, float *centroids, long *assign, size_t d, size_t k, size_t n, size_t k_frozen)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01078" > utils.cpp:1078< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a5eb1701e46123827966f2a56da893d1d" > < div class = "ttname" > < a href = "namespacefaiss.html#a5eb1701e46123827966f2a56da893d1d" > faiss::knn_L2sqr_base_shift< / a > < / div > < div class = "ttdeci" > void knn_L2sqr_base_shift(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_maxheap_array_t *res, const float *base_shift)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00664" > utils.cpp:664< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a7466bd32de31640860393a701eaac5ad" > < div class = "ttname" > < a href = "namespacefaiss.html#a7466bd32de31640860393a701eaac5ad" > faiss::fvec_L2sqr< / a > < / div > < div class = "ttdeci" > float fvec_L2sqr(const float *x, const float *y, size_t d)< / div > < div class = "ttdoc" > Squared L2 distance between two vectors. < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils__simd_8cpp_source.html#l00501" > utils_simd.cpp:501< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_ad86caef545c6a7672422d7d34c03f446" > < div class = "ttname" > < a href = "namespacefaiss.html#ad86caef545c6a7672422d7d34c03f446" > faiss::check_openmp< / a > < / div > < div class = "ttdeci" > bool check_openmp()< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01596" > utils.cpp:1596< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a154a47857ed321b9db91122770a16e09" > < div class = "ttname" > < a href = "namespacefaiss.html#a154a47857ed321b9db91122770a16e09" > faiss::bincode_hist< / a > < / div > < div class = "ttdeci" > void bincode_hist(size_t n, size_t nbits, const uint8_t *codes, int *hist)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01326" > utils.cpp:1326< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a14884d253128c7af5891a65082ad7dc6" > < div class = "ttname" > < a href = "namespacefaiss.html#a14884d253128c7af5891a65082ad7dc6" > faiss::fvecs_maybe_subsample< / a > < / div > < div class = "ttdeci" > const float * fvecs_maybe_subsample(size_t d, size_t *n, size_t nmax, const float *x, bool verbose, long seed)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01540" > utils.cpp:1540< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_ae0ee1b6fbd3d6da0f1a3550a780ca24c" > < div class = "ttname" > < a href = "namespacefaiss.html#ae0ee1b6fbd3d6da0f1a3550a780ca24c" > faiss::ranklist_handle_ties< / a > < / div > < div class = "ttdeci" > void ranklist_handle_ties(int k, long *idx, const float *dis)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01172" > utils.cpp:1172< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1RandomGenerator_html_ac82a433d7bfa56d750907ba5cf74aed7" > < div class = "ttname" > < a href = "structfaiss_1_1RandomGenerator.html#ac82a433d7bfa56d750907ba5cf74aed7" > faiss::RandomGenerator::rand_float< / a > < / div > < div class = "ttdeci" > float rand_float()< / div > < div class = "ttdoc" > between 0 and 1 < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00129" > utils.cpp:129< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a40328c31abd0bbba5bd95d7de951e847" > < div class = "ttname" > < a href = "namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847" > faiss::fvec_madd< / a > < / div > < div class = "ttdeci" > void fvec_madd(size_t n, const float *a, float bf, const float *b, float *c)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils__simd_8cpp_source.html#l00588" > utils_simd.cpp:588< / a > < / div > < / div >
2017-02-23 06:26:44 +08:00
< div class = "ttc" id = "namespacefaiss_html_aa3af5769b0b649f112332a874c64d361" > < div class = "ttname" > < a href = "namespacefaiss.html#aa3af5769b0b649f112332a874c64d361" > faiss::get_mem_usage_kb< / a > < / div > < div class = "ttdeci" > size_t get_mem_usage_kb()< / div > < div class = "ttdoc" > get current RSS usage in kB < / div > < / div >
2019-05-28 22:17:22 +08:00
< div class = "ttc" id = "namespacefaiss_html_a7bea462108bee98d8d5859b51ec4db8e" > < div class = "ttname" > < a href = "namespacefaiss.html#a7bea462108bee98d8d5859b51ec4db8e" > faiss::ivec_hist< / a > < / div > < div class = "ttdeci" > int ivec_hist(size_t n, const int *v, int vmax, int *hist)< / div > < div class = "ttdoc" > compute histogram on v < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01315" > utils.cpp:1315< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1RandomGenerator_html_acbceaa8b017793ca4f8d90e644b0d7f4" > < div class = "ttname" > < a href = "structfaiss_1_1RandomGenerator.html#acbceaa8b017793ca4f8d90e644b0d7f4" > faiss::RandomGenerator::rand_long< / a > < / div > < div class = "ttdeci" > long rand_long()< / div > < div class = "ttdoc" > random long < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00119" > utils.cpp:119< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_abefd45801bab63d2eb71005ad7a51d32" > < div class = "ttname" > < a href = "namespacefaiss.html#abefd45801bab63d2eb71005ad7a51d32" > faiss::hash_bytes< / a > < / div > < div class = "ttdeci" > uint64_t hash_bytes(const uint8_t *bytes, long n)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01584" > utils.cpp:1584< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_afb7b33f6892678ba79aaf5e71777837c" > < div class = "ttname" > < a href = "namespacefaiss.html#afb7b33f6892678ba79aaf5e71777837c" > faiss::merge_result_table_with< / a > < / div > < div class = "ttdeci" > size_t merge_result_table_with(size_t n, size_t k, long *I0, float *D0, const long *I1, const float *D1, bool keep_min, long translation)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01188" > utils.cpp:1188< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1RandomGenerator_html_a583f124ecacdbe037ac96e23a44dd420" > < div class = "ttname" > < a href = "structfaiss_1_1RandomGenerator.html#a583f124ecacdbe037ac96e23a44dd420" > faiss::RandomGenerator::rand_int< / a > < / div > < div class = "ttdeci" > int rand_int()< / div > < div class = "ttdoc" > random positive integer < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00114" > utils.cpp:114< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1HeapArray_html" > < div class = "ttname" > < a href = "structfaiss_1_1HeapArray.html" > faiss::HeapArray< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "Heap_8h_source.html#l00349" > Heap.h:349< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a8dbc652ba48d41f126b8815004899448" > < div class = "ttname" > < a href = "namespacefaiss.html#a8dbc652ba48d41f126b8815004899448" > faiss::ranklist_intersection_size< / a > < / div > < div class = "ttdeci" > size_t ranklist_intersection_size(size_t k1, const long *v1, size_t k2, const long *v2_in)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01253" > utils.cpp:1253< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a3d9c7db82d43c1f0ab1d28b92bc9fe57" > < div class = "ttname" > < a href = "namespacefaiss.html#a3d9c7db82d43c1f0ab1d28b92bc9fe57" > faiss::pairwise_L2sqr< / a > < / div > < div class = "ttdeci" > void pairwise_L2sqr(long d, long nq, const float *xq, long nb, const float *xb, float *dis, long ldq, long ldb, long ldd)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01021" > utils.cpp:1021< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_ab29d725b808df6f142b80f21aa45e507" > < div class = "ttname" > < a href = "namespacefaiss.html#ab29d725b808df6f142b80f21aa45e507" > faiss::range_search_inner_product< / a > < / div > < div class = "ttdeci" > void range_search_inner_product(const float *x, const float *y, size_t d, size_t nx, size_t ny, float radius, RangeSearchResult *res)< / div > < div class = "ttdoc" > same as range_search_L2sqr for the inner product similarity < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00959" > utils.cpp:959< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a880c7318971f866267a86945aaa61b17" > < div class = "ttname" > < a href = "namespacefaiss.html#a880c7318971f866267a86945aaa61b17" > faiss::knn_inner_product< / a > < / div > < div class = "ttdeci" > void knn_inner_product(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_minheap_array_t *res)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00624" > utils.cpp:624< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_af2a71f7d5402ae02ce169a4cc83020eb" > < div class = "ttname" > < a href = "namespacefaiss.html#af2a71f7d5402ae02ce169a4cc83020eb" > faiss::getmillisecs< / a > < / div > < div class = "ttdeci" > double getmillisecs()< / div > < div class = "ttdoc" > ms elapsed since some arbitrary epoch < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00069" > utils.cpp:69< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_ab491c9e2f77a750c9f0324bfe00e3e57" > < div class = "ttname" > < a href = "namespacefaiss.html#ab491c9e2f77a750c9f0324bfe00e3e57" > faiss::real_to_binary< / a > < / div > < div class = "ttdeci" > void real_to_binary(size_t d, const float *x_in, uint8_t *x_out)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01570" > utils.cpp:1570< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a94c1d99ac39d22e362aa27ce7c7ff714" > < div class = "ttname" > < a href = "namespacefaiss.html#a94c1d99ac39d22e362aa27ce7c7ff714" > faiss::imbalance_factor< / a > < / div > < div class = "ttdeci" > double imbalance_factor(int k, const int *hist)< / div > < div class = "ttdoc" > same, takes a histogram as input < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01291" > utils.cpp:1291< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a7a49180ebf10e643217bbce5862c7f84" > < div class = "ttname" > < a href = "namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84" > faiss::fvec_norm_L2sqr< / a > < / div > < div class = "ttdeci" > float fvec_norm_L2sqr(const float *x, size_t d)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils__simd_8cpp_source.html#l00515" > utils_simd.cpp:515< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a1faa7bd079c9b1addf3058ddf882a000" > < div class = "ttname" > < a href = "namespacefaiss.html#a1faa7bd079c9b1addf3058ddf882a000" > faiss::range_search_L2sqr< / a > < / div > < div class = "ttdeci" > void range_search_L2sqr(const float *x, const float *y, size_t d, size_t nx, size_t ny, float radius, RangeSearchResult *res)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00944" > utils.cpp:944< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_afb68fe89ad5e948974da1b70d7b4157c" > < div class = "ttname" > < a href = "namespacefaiss.html#afb68fe89ad5e948974da1b70d7b4157c" > faiss::matrix_qr< / a > < / div > < div class = "ttdeci" > void matrix_qr(int m, int n, float *a)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00999" > utils.cpp:999< / a > < / div > < / div >
2018-12-20 00:48:35 +08:00
< div class = "ttc" id = "structfaiss_1_1RangeSearchResult_html" > < div class = "ttname" > < a href = "structfaiss_1_1RangeSearchResult.html" > faiss::RangeSearchResult< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "AuxIndexStructures_8h_source.html#l00031" > AuxIndexStructures.h:31< / a > < / div > < / div >
2019-05-28 22:17:22 +08:00
< div class = "ttc" id = "namespacefaiss_html_a4369329c9dbdfe23e3f35d09ba7b5c6e" > < div class = "ttname" > < a href = "namespacefaiss.html#a4369329c9dbdfe23e3f35d09ba7b5c6e" > faiss::ivec_checksum< / a > < / div > < div class = "ttdeci" > size_t ivec_checksum(size_t n, const int *a)< / div > < div class = "ttdoc" > compute a checksum on a table. < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01349" > utils.cpp:1349< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a9da63b8bb84460f5e8ccf8e17622cc7a" > < div class = "ttname" > < a href = "namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a" > faiss::fvec_madd_and_argmin< / a > < / div > < div class = "ttdeci" > int fvec_madd_and_argmin(size_t n, const float *a, float bf, const float *b, float *c)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils__simd_8cpp_source.html#l00675" > utils_simd.cpp:675< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_a2f803e3d3b07cfab63699c89de161237" > < div class = "ttname" > < a href = "namespacefaiss.html#a2f803e3d3b07cfab63699c89de161237" > faiss::knn_L2sqr< / a > < / div > < div class = "ttdeci" > void knn_L2sqr(const float *x, const float *y, size_t d, size_t nx, size_t ny, float_maxheap_array_t *res)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l00644" > utils.cpp:644< / a > < / div > < / div >
< div class = "ttc" id = "namespacefaiss_html_ac8260e10cfeed08a4344b85845773e16" > < div class = "ttname" > < a href = "namespacefaiss.html#ac8260e10cfeed08a4344b85845773e16" > faiss::binary_to_real< / a > < / div > < div class = "ttdeci" > void binary_to_real(size_t d, const uint8_t *x_in, float *x_out)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "utils_8cpp_source.html#l01564" > utils.cpp:1564< / a > < / div > < / div >
2017-02-23 06:26:44 +08:00
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