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2017-02-23 06:26:44 +08:00
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< div class = "title" > /data/users/hoss/faiss/IndexLSH.cpp< / div > < / div >
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > /**< / span > < / div >
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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 = "preprocessor" > #include " IndexLSH.h" < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "preprocessor" > #include < cstdio> < / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "preprocessor" > #include < cstring> < / span > < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "preprocessor" > #include < algorithm> < / 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" > #include " utils.h" < / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "preprocessor" > #include " hamming.h" < / span > < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "preprocessor" > #include " FaissAssert.h" < / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < / div >
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< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < / div >
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< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keyword" > namespace < / span > faiss {< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "comment" > /***************************************************************< / span > < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "comment" > * IndexLSH< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "comment" > ***************************************************************/< / span > < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < / div >
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< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < / div >
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< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   IndexLSH::IndexLSH (idx_t d, < span class = "keywordtype" > int< / span > nbits, < span class = "keywordtype" > bool< / span > rotate_data, < span class = "keywordtype" > bool< / span > train_thresholds):< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   Index(d), nbits(nbits), rotate_data(rotate_data),< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   train_thresholds (train_thresholds), rrot(d, nbits)< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   {< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < a class = "code" href = "structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f" > is_trained< / a > = !train_thresholds;< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   bytes_per_vec = (nbits + 7) / 8;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > if< / span > (rotate_data) {< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   rrot.init(5);< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   FAISS_THROW_IF_NOT (d > = nbits);< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   }< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   }< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   IndexLSH::IndexLSH ():< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   nbits (0), bytes_per_vec(0), rotate_data (false), train_thresholds (false)< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   {< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   }< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < / div >
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< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < / div >
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< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > 50< / a > < / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > * < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > IndexLSH::apply_preprocess< / a > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *x)< span class = "keyword" > const< / span > < / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keyword" > < / span > {< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   < span class = "keywordtype" > float< / span > *xt = < span class = "keyword" > nullptr< / span > ;< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "keywordflow" > if< / span > (rotate_data) {< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "comment" > // also applies bias if exists< / span > < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   xt = < a class = "code" href = "structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8" > rrot< / a > .< a class = "code" href = "structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5" > apply< / a > (n, x);< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (d != nbits) {< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   xt = < span class = "keyword" > new< / span > < span class = "keywordtype" > float< / span > [nbits * n];< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keywordtype" > float< / span > *xp = xt;< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordflow" > for< / span > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > i = 0; i < n; i++) {< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xl = x + i * < a class = "code" href = "structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d" > d< / a > ;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = 0; j < < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ; j++)< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   *xp++ = xl [j];< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   }< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   }< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < span class = "keywordflow" > if< / span > (train_thresholds) {< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < span class = "keywordflow" > if< / span > (xt == NULL) {< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   xt = < span class = "keyword" > new< / span > < span class = "keywordtype" > float< / span > [nbits * n];< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   memcpy (xt, x, < span class = "keyword" > sizeof< / span > (*x) * n * nbits);< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   }< / 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 = "keywordtype" > float< / span > *xp = xt;< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keywordflow" > for< / span > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > i = 0; i < n; i++)< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = 0; j < < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ; j++)< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   *xp++ -= < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > [j];< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   }< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   < span class = "keywordflow" > return< / span > xt ? xt : x;< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   }< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < / div >
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< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   < / div >
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< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06" > 85< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06" > IndexLSH::train< / a > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *x)< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   {< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keywordflow" > if< / span > (train_thresholds) {< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > .resize (nbits);< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   train_thresholds = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xt = < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > apply_preprocess< / a > (n, x);< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< float> < / a > del (xt == x ? < span class = "keyword" > nullptr< / span > : xt);< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   train_thresholds = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordtype" > float< / span > * transposed_x = < span class = "keyword" > new< / span > < span class = "keywordtype" > float< / span > [n * < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ];< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< float> < / a > del2 (transposed_x);< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "keywordflow" > for< / span > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > i = 0; i < n; i++)< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "keywordflow" > for< / span > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > j = 0; j < < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ; j++)< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   transposed_x [j * n + i] = xt [i * nbits + j];< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "keywordflow" > for< / span > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > i = 0; i < < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ; i++) {< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   < span class = "keywordtype" > float< / span > *xi = transposed_x + i * n;< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "comment" > // std::nth_element< / span > < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   std::sort (xi, xi + n);< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "keywordflow" > if< / span > (n % 2 == 1)< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > [i] = xi [n / 2];< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > [i] = (xi [n / 2 - 1] + xi [n / 2]) / 2;< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   }< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   }< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   < a class = "code" href = "structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f" > is_trained< / a > = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   }< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < / div >
2017-06-21 21:54:28 +08:00
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8" > 116< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8" > IndexLSH::add< / a > (< a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > n, < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *x)< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   {< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   FAISS_THROW_IF_NOT (< a class = "code" href = "structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f" > is_trained< / a > );< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xt = < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > apply_preprocess< / a > (n, x);< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< float> < / a > del (xt == x ? < span class = "keyword" > nullptr< / span > : xt);< / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   < / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572" > codes< / a > .resize ((< a class = "code" href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > ntotal< / a > + n) * < a class = "code" href = "structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6" > bytes_per_vec< / a > );< / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   fvecs2bitvecs (xt, & < a class = "code" href = "structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572" > codes< / a > [< a class = "code" href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > ntotal< / a > * bytes_per_vec], nbits, n);< / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < a class = "code" href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > ntotal< / a > += n;< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   }< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < / div >
2017-06-21 21:54:28 +08:00
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee" > 128< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee" > IndexLSH::search< / a > (< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   < a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > n,< / 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 >   < a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > k,< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "keywordtype" > float< / span > *distances,< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   < a class = "code" href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > idx_t< / a > *labels)< span class = "keyword" > const< / span > < / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < span class = "keyword" > < / span > {< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   FAISS_THROW_IF_NOT (< a class = "code" href = "structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f" > is_trained< / a > );< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > float< / span > *xt = < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > apply_preprocess< / a > (n, x);< / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< float> < / a > del (xt == x ? < span class = "keyword" > nullptr< / span > : xt);< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   uint8_t * qcodes = < span class = "keyword" > new< / span > uint8_t [n * < a class = "code" href = "structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6" > bytes_per_vec< / a > ];< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< uint8_t> < / a > del2 (qcodes);< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   < / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   fvecs2bitvecs (xt, qcodes, nbits, n);< / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   < / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   < span class = "keywordtype" > int< / span > * idistances = < span class = "keyword" > new< / span > < span class = "keywordtype" > int< / span > [n * k];< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   < a class = "code" href = "structfaiss_1_1ScopeDeleter.html" > ScopeDeleter< int> < / a > del3 (idistances);< / div >
< div class = "line" > < a name = "l00146" > < / a > < span class = "lineno" > 146< / span >   < / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   < a class = "code" href = "structfaiss_1_1HeapArray.html" > int_maxheap_array_t< / a > res = { size_t(n), size_t(k), labels, idistances};< / 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 >   < a class = "code" href = "namespacefaiss.html#aef2e95991f435b0103db0efe07edff81" > hammings_knn_hc< / a > (& res, qcodes, < a class = "code" href = "structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572" > codes< / a > .data(),< / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < a class = "code" href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > ntotal< / a > , < a class = "code" href = "structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6" > bytes_per_vec< / a > , < span class = "keyword" > true< / span > );< / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   < / div >
2017-02-23 06:26:44 +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" > // convert distances to floats< / span > < / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < k * n; i++)< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   distances[i] = idistances[i];< / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   < / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   }< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   < / div >
2017-06-21 21:54:28 +08:00
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c" > 160< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c" > IndexLSH::transfer_thresholds< / a > (< a class = "code" href = "structfaiss_1_1LinearTransform.html" > LinearTransform< / a > *vt) {< / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < span class = "keywordflow" > if< / span > (!train_thresholds) < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   FAISS_THROW_IF_NOT (nbits == vt-> < a class = "code" href = "structfaiss_1_1VectorTransform.html#a589d612f7b1773614619a0cbecd728a9" > d_out< / a > );< / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   < span class = "keywordflow" > if< / span > (!vt-> have_bias) {< / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   vt-> < a class = "code" href = "structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87" > b< / a > .resize (nbits, 0);< / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   vt-> have_bias = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   }< / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < < a class = "code" href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > nbits< / a > ; i++)< / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   vt-> < a class = "code" href = "structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87" > b< / a > [i] -= < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > [i];< / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   train_thresholds = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > thresholds< / a > .clear();< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   }< / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > < a class = "line" href = "structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab" > 173< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab" > IndexLSH::reset< / a > () {< / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < a class = "code" href = "structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572" > codes< / a > .clear();< / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < a class = "code" href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > ntotal< / a > = 0;< / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   }< / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < / div >
2017-06-21 21:54:28 +08:00
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < / div >
2019-05-28 22:17:22 +08:00
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   } < span class = "comment" > // namespace faiss< / span > < / div >
< div class = "ttc" id = "namespacefaiss_html_aef2e95991f435b0103db0efe07edff81" > < div class = "ttname" > < a href = "namespacefaiss.html#aef2e95991f435b0103db0efe07edff81" > faiss::hammings_knn_hc< / a > < / div > < div class = "ttdeci" > void hammings_knn_hc(int_maxheap_array_t *ha, const uint8_t *a, const uint8_t *b, size_t nb, size_t ncodes, int order)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "hamming_8cpp_source.html#l00517" > hamming.cpp:517< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a0116f529bc5de64a7ef142caa652d9f6" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a0116f529bc5de64a7ef142caa652d9f6" > faiss::IndexLSH::bytes_per_vec< / a > < / div > < div class = "ttdeci" > int bytes_per_vec< / div > < div class = "ttdoc" > nb of 8-bits per encoded vector < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8h_source.html#l00026" > IndexLSH.h:26< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_ae203ad895b15ae16fc1a748661b84df3" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#ae203ad895b15ae16fc1a748661b84df3" > faiss::IndexLSH::thresholds< / a > < / div > < div class = "ttdeci" > std::vector< float > thresholds< / div > < div class = "ttdoc" > thresholds to compare with < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8h_source.html#l00032" > IndexLSH.h:32< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1ScopeDeleter_html" > < div class = "ttname" > < a href = "structfaiss_1_1ScopeDeleter.html" > faiss::ScopeDeleter< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "FaissException_8h_source.html#l00045" > FaissException.h:45< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a66b6afb56afa1f58e2d93abfdfd223ee" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a66b6afb56afa1f58e2d93abfdfd223ee" > faiss::IndexLSH::search< / a > < / div > < div class = "ttdeci" > void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00128" > IndexLSH.cpp:128< / a > < / div > < / div >
2018-12-20 00:48:35 +08:00
< div class = "ttc" id = "structfaiss_1_1Index_html_a2a002388d2c081c2dbab8508dcefe73d" > < div class = "ttname" > < a href = "structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d" > faiss::Index::d< / a > < / div > < div class = "ttdeci" > int d< / div > < div class = "ttdoc" > vector dimension < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "Index_8h_source.html#l00066" > Index.h:66< / a > < / div > < / div >
2019-05-28 22:17:22 +08:00
< div class = "ttc" id = "structfaiss_1_1Index_html_ad3f0d3071f987baabbdd3da4500c87ea" > < div class = "ttname" > < a href = "structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea" > faiss::Index::idx_t< / a > < / div > < div class = "ttdeci" > long idx_t< / div > < div class = "ttdoc" > all indices are this type < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "Index_8h_source.html#l00062" > Index.h:62< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1LinearTransform_html_ab0383f690aeb823876e9143febad1a87" > < div class = "ttname" > < a href = "structfaiss_1_1LinearTransform.html#ab0383f690aeb823876e9143febad1a87" > faiss::LinearTransform::b< / a > < / div > < div class = "ttdeci" > std::vector< float > b< / div > < div class = "ttdoc" > bias vector, size d_out < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "VectorTransform_8h_source.html#l00086" > VectorTransform.h:86< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a71c8aa08d3bd0483ccc0f11c22cd3cd8" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a71c8aa08d3bd0483ccc0f11c22cd3cd8" > faiss::IndexLSH::rrot< / a > < / div > < div class = "ttdeci" > RandomRotationMatrix rrot< / div > < div class = "ttdoc" > optional random rotation < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8h_source.html#l00030" > IndexLSH.h:30< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_ac95fb0b3cb8fe2b265be9822c41c448c" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#ac95fb0b3cb8fe2b265be9822c41c448c" > faiss::IndexLSH::transfer_thresholds< / a > < / div > < div class = "ttdeci" > void transfer_thresholds(LinearTransform *vt)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00160" > IndexLSH.cpp:160< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1LinearTransform_html" > < div class = "ttname" > < a href = "structfaiss_1_1LinearTransform.html" > faiss::LinearTransform< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "VectorTransform_8h_source.html#l00075" > VectorTransform.h:75< / 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 >
2018-12-20 00:48:35 +08:00
< div class = "ttc" id = "structfaiss_1_1Index_html_a6970683faa021b7a6f1a0865c0d4eccd" > < div class = "ttname" > < a href = "structfaiss_1_1Index.html#a6970683faa021b7a6f1a0865c0d4eccd" > faiss::Index::ntotal< / a > < / div > < div class = "ttdeci" > idx_t ntotal< / div > < div class = "ttdoc" > total nb of indexed vectors < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "Index_8h_source.html#l00067" > Index.h:67< / a > < / div > < / div >
2019-05-28 22:17:22 +08:00
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_aba7791311191bb168b79f8f59dd459ab" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#aba7791311191bb168b79f8f59dd459ab" > faiss::IndexLSH::reset< / a > < / div > < div class = "ttdeci" > void reset() override< / div > < div class = "ttdoc" > removes all elements from the database. < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00173" > IndexLSH.cpp:173< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a76de2c3212c72fd48136d84283a6e0a8" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a76de2c3212c72fd48136d84283a6e0a8" > faiss::IndexLSH::add< / a > < / div > < div class = "ttdeci" > void add(idx_t n, const float *x) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00116" > IndexLSH.cpp:116< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a01f569a16a812aa3945b8a0b64eaff06" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a01f569a16a812aa3945b8a0b64eaff06" > faiss::IndexLSH::train< / a > < / div > < div class = "ttdeci" > void train(idx_t n, const float *x) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00085" > IndexLSH.cpp:85< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1VectorTransform_html_a589d612f7b1773614619a0cbecd728a9" > < div class = "ttname" > < a href = "structfaiss_1_1VectorTransform.html#a589d612f7b1773614619a0cbecd728a9" > faiss::VectorTransform::d_out< / a > < / div > < div class = "ttdeci" > int d_out< / div > < div class = "ttdoc" > ! input dimension < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "VectorTransform_8h_source.html#l00031" > VectorTransform.h:31< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_af8c48006f210f0cbbf45ec9972558d20" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#af8c48006f210f0cbbf45ec9972558d20" > faiss::IndexLSH::nbits< / a > < / div > < div class = "ttdeci" > int nbits< / div > < div class = "ttdoc" > nb of bits per vector < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8h_source.html#l00025" > IndexLSH.h:25< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#ae7bb111e0aa6bd1b2a13e5efa8ef9cea" > faiss::IndexLSH::apply_preprocess< / a > < / div > < div class = "ttdeci" > const float * apply_preprocess(idx_t n, const float *x) const < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8cpp_source.html#l00050" > IndexLSH.cpp:50< / a > < / div > < / div >
2018-12-20 00:48:35 +08:00
< div class = "ttc" id = "structfaiss_1_1Index_html_a6e92732617c4dbe364e7678dd8773a7f" > < div class = "ttname" > < a href = "structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f" > faiss::Index::is_trained< / a > < / div > < div class = "ttdeci" > bool is_trained< / div > < div class = "ttdoc" > set if the Index does not require training, or if training is done already < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "Index_8h_source.html#l00071" > Index.h:71< / a > < / div > < / div >
2019-05-28 22:17:22 +08:00
< div class = "ttc" id = "structfaiss_1_1VectorTransform_html_af3b3a8bf95911f4b28128001c83f91a5" > < div class = "ttname" > < a href = "structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5" > faiss::VectorTransform::apply< / a > < / div > < div class = "ttdeci" > float * apply(idx_t n, const float *x) const < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "VectorTransform_8cpp_source.html#l00070" > VectorTransform.cpp:70< / a > < / div > < / div >
< div class = "ttc" id = "structfaiss_1_1IndexLSH_html_a55c0f1127850af0d06ef22fc8b791572" > < div class = "ttname" > < a href = "structfaiss_1_1IndexLSH.html#a55c0f1127850af0d06ef22fc8b791572" > faiss::IndexLSH::codes< / a > < / div > < div class = "ttdeci" > std::vector< uint8_t > codes< / div > < div class = "ttdoc" > encoded dataset < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "IndexLSH_8h_source.html#l00035" > IndexLSH.h:35< / a > < / div > < / div >
2017-02-23 06:26:44 +08:00
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