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< title > Faiss: /data/users/matthijs/github_faiss/faiss/gpu/impl/IVFUtilsSelect2.cu Source File< / title >
2017-02-23 06:26:44 +08:00
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > < / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > /**< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > * Copyright (c) 2015-present, Facebook, Inc.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > * All rights reserved.< / span > < / div >
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< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < span class = "comment" > * This source code is licensed under the CC-by-NC license found in the< / span > < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "comment" > * LICENSE file in the root directory of this source tree.< / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < span class = "comment" > */< / 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" > // Copyright 2004-present Facebook. All Rights Reserved.< / 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 " IVFUtils.cuh" < / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "preprocessor" > #include " ../utils/DeviceUtils.h" < / span > < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "preprocessor" > #include " ../utils/Select.cuh" < / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "preprocessor" > #include " ../utils/StaticUtils.h" < / span > < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < span class = "preprocessor" > #include " ../utils/Tensor.cuh" < / span > < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "preprocessor" > #include < limits> < / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "comment" > // This kernel is split into a separate compilation unit to cut down< / span > < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "comment" > // on compile time< / span > < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "comment" > //< / 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 = "keyword" > namespace < / span > faiss { < span class = "keyword" > namespace < / span > gpu {< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   constexpr < span class = "keyword" > auto< / span > kMax = std::numeric_limits< float> ::max();< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   constexpr < span class = "keyword" > auto< / span > kMin = std::numeric_limits< float> ::min();< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "comment" > // This is warp divergence central, but this is really a final step< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "comment" > // and happening a small number of times< / span > < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "keyword" > inline< / span > __device__ < span class = "keywordtype" > int< / span > binarySearchForBucket(< span class = "keywordtype" > int< / span > * prefixSumOffsets,< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "keywordtype" > int< / span > size,< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "keywordtype" > int< / span > val) {< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordtype" > int< / span > start = 0;< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keywordtype" > int< / span > end = size;< / 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" > while< / span > (end - start > 0) {< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "keywordtype" > int< / span > mid = start + (end - start) / 2;< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "keywordtype" > int< / span > midVal = prefixSumOffsets[mid];< / 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 >   < span class = "comment" > // Find the first bucket that we are < =< / span > < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "keywordflow" > if< / span > (midVal < = val) {< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   start = mid + 1;< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   end = mid;< / 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 >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "comment" > // We must find the bucket that it is in< / span > < / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   assert(start != size);< / 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 = "keywordflow" > return< / span > start;< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   }< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keyword" > template< / span > < < span class = "keywordtype" > int< / span > ThreadsPerBlock,< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordtype" > int< / span > NumWarpQ,< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "keywordtype" > int< / span > NumThreadQ,< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keywordtype" > bool< / span > Dir> < / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   __global__ < span class = "keywordtype" > void< / span > < / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   pass2SelectLists(Tensor< float, 2, true> heapDistances,< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   Tensor< int, 2, true> heapIndices,< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   < span class = "keywordtype" > void< / span > ** listIndices,< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   Tensor< int, 2, true> prefixSumOffsets,< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   Tensor< int, 2, true> topQueryToCentroid,< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "keywordtype" > int< / span > k,< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   IndicesOptions opt,< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   Tensor< float, 2, true> outDistances,< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   Tensor< long, 2, true> outIndices) {< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   constexpr < span class = "keywordtype" > int< / span > kNumWarps = ThreadsPerBlock / kWarpSize;< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   __shared__ < span class = "keywordtype" > float< / span > smemK[kNumWarps * NumWarpQ];< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   __shared__ < span class = "keywordtype" > int< / span > smemV[kNumWarps * NumWarpQ];< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   constexpr < span class = "keyword" > auto< / span > kInit = Dir ? kMin : kMax;< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   BlockSelect< float, int, Dir, Comparator< float> ,< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   NumWarpQ, NumThreadQ, ThreadsPerBlock> < / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   heap(kInit, -1, smemK, smemV, k);< / 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 = "keyword" > auto< / span > queryId = blockIdx.x;< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "keywordtype" > int< / span > num = heapDistances.getSize(1);< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < span class = "keywordtype" > int< / span > limit = utils::roundDown(num, kWarpSize);< / div >
< 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 >   < span class = "keywordtype" > int< / span > i = threadIdx.x;< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "keyword" > auto< / span > heapDistanceStart = heapDistances[queryId];< / 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 = "comment" > // BlockSelect add cannot be used in a warp divergent circumstance; we< / span > < / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   < span class = "comment" > // handle the remainder warp below< / span > < / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < span class = "keywordflow" > for< / span > (; i < limit; i += blockDim.x) {< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   heap.add(heapDistanceStart[i], i);< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   }< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < span class = "comment" > // Handle warp divergence separately< / span > < / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordflow" > if< / span > (i < num) {< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   heap.addThreadQ(heapDistanceStart[i], i);< / 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 >   < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > // Merge all final results< / span > < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   heap.reduce();< / 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 > (< span class = "keywordtype" > int< / span > i = threadIdx.x; i < k; i += blockDim.x) {< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   outDistances[queryId][i] = smemK[i];< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "comment" > // `v` is the index in `heapIndices`< / span > < / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "comment" > // We need to translate this into an original user index. The< / span > < / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < span class = "comment" > // reason why we don' t maintain intermediate results in terms of< / span > < / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "comment" > // user indices is to substantially reduce temporary memory< / span > < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < span class = "comment" > // requirements and global memory write traffic for the list< / span > < / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "comment" > // scanning.< / span > < / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < span class = "comment" > // This code is highly divergent, but it' s probably ok, since this< / span > < / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < span class = "comment" > // is the very last step and it is happening a small number of< / span > < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   < span class = "comment" > // times (#queries x k).< / span > < / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "keywordtype" > int< / span > v = smemV[i];< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "keywordtype" > long< / span > index = -1;< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < span class = "keywordflow" > if< / span > (v != -1) {< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "comment" > // `offset` is the offset of the intermediate result, as< / span > < / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   < span class = "comment" > // calculated by the original scan.< / span > < / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < span class = "keywordtype" > int< / span > offset = heapIndices[queryId][v];< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   < span class = "comment" > // In order to determine the actual user index, we need to first< / span > < / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < span class = "comment" > // determine what list it was in.< / span > < / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < span class = "comment" > // We do this by binary search in the prefix sum list.< / span > < / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < span class = "keywordtype" > int< / span > probe = binarySearchForBucket(prefixSumOffsets[queryId].data(),< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   prefixSumOffsets.getSize(1),< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   offset);< / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   < / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   < span class = "comment" > // This is then the probe for the query; we can find the actual< / span > < / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   < span class = "comment" > // list ID from this< / span > < / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < span class = "keywordtype" > int< / span > listId = topQueryToCentroid[queryId][probe];< / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   < / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "comment" > // Now, we need to know the offset within the list< / span > < / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   < span class = "comment" > // We ensure that before the array (at offset -1), there is a 0 value< / span > < / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < span class = "keywordtype" > int< / span > listStart = *(prefixSumOffsets[queryId][probe].data() - 1);< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   < span class = "keywordtype" > int< / span > listOffset = offset - listStart;< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   < span class = "comment" > // This gives us our final index< / span > < / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < span class = "keywordflow" > if< / span > (opt == INDICES_32_BIT) {< / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   index = (long) ((< span class = "keywordtype" > int< / span > *) listIndices[listId])[listOffset];< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (opt == INDICES_64_BIT) {< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   index = ((< span class = "keywordtype" > long< / span > *) listIndices[listId])[listOffset];< / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   index = ((long) listId < < 32 | (< span class = "keywordtype" > long< / span > ) listOffset);< / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   }< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   }< / 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 >   outIndices[queryId][i] = index;< / 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 >   }< / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   < span class = "keywordtype" > void< / span > < / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   runPass2SelectLists(Tensor< float, 2, true> & heapDistances,< / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   Tensor< int, 2, true> & heapIndices,< / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   thrust::device_vector< void*> & listIndices,< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   IndicesOptions indicesOptions,< / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   Tensor< int, 2, true> & prefixSumOffsets,< / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   Tensor< int, 2, true> & topQueryToCentroid,< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   < span class = "keywordtype" > int< / span > k,< / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   < span class = "keywordtype" > bool< / span > chooseLargest,< / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   Tensor< float, 2, true> & outDistances,< / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   Tensor< long, 2, true> & outIndices,< / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   cudaStream_t stream) {< / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   constexpr < span class = "keyword" > auto< / span > kThreadsPerBlock = 128;< / 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 = "keyword" > auto< / span > grid = dim3(topQueryToCentroid.getSize(0));< / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < span class = "keyword" > auto< / span > block = dim3(kThreadsPerBlock);< / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   < / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   < span class = "preprocessor" > #define RUN_PASS(NUM_WARP_Q, NUM_THREAD_Q, DIR) \< / span > < / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "preprocessor" > do { \< / span > < / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   < span class = "preprocessor" > pass2SelectLists< kThreadsPerBlock, \< / span > < / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   < span class = "preprocessor" > NUM_WARP_Q, NUM_THREAD_Q, DIR> \< / span > < / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < span class = "preprocessor" > < < < grid, block, 0, stream> > > (heapDistances, \< / span > < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < span class = "preprocessor" > heapIndices, \< / span > < / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < span class = "preprocessor" > listIndices.data().get(), \< / span > < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "preprocessor" > prefixSumOffsets, \< / span > < / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < span class = "preprocessor" > topQueryToCentroid, \< / span > < / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < span class = "preprocessor" > k, \< / span > < / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < span class = "preprocessor" > indicesOptions, \< / span > < / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   < span class = "preprocessor" > outDistances, \< / span > < / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   < span class = "preprocessor" > outIndices); \< / span > < / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   < span class = "preprocessor" > return; < / span > < span class = "comment" > /* success */< / span > < span class = "preprocessor" > \< / span > < / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   < span class = "preprocessor" > } while (0)< / span > < / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   < span class = "preprocessor" > #define RUN_PASS_DIR(DIR) \< / span > < / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < span class = "preprocessor" > do { \< / span > < / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   < span class = "preprocessor" > if (k == 1) { \< / span > < / div >
< div class = "line" > < a name = "l00187" > < / a > < span class = "lineno" > 187< / span >   < span class = "preprocessor" > RUN_PASS(1, 1, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00188" > < / a > < span class = "lineno" > 188< / span >   < span class = "preprocessor" > } else if (k < = 32) { \< / span > < / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   < span class = "preprocessor" > RUN_PASS(32, 2, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   < span class = "preprocessor" > } else if (k < = 64) { \< / span > < / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   < span class = "preprocessor" > RUN_PASS(64, 3, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   < span class = "preprocessor" > } else if (k < = 128) { \< / span > < / div >
< div class = "line" > < a name = "l00193" > < / a > < span class = "lineno" > 193< / span >   < span class = "preprocessor" > RUN_PASS(128, 3, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00194" > < / a > < span class = "lineno" > 194< / span >   < span class = "preprocessor" > } else if (k < = 256) { \< / span > < / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   < span class = "preprocessor" > RUN_PASS(256, 4, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   < span class = "preprocessor" > } else if (k < = 512) { \< / span > < / div >
< div class = "line" > < a name = "l00197" > < / a > < span class = "lineno" > 197< / span >   < span class = "preprocessor" > RUN_PASS(512, 8, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00198" > < / a > < span class = "lineno" > 198< / span >   < span class = "preprocessor" > } else if (k < = 1024) { \< / span > < / div >
< div class = "line" > < a name = "l00199" > < / a > < span class = "lineno" > 199< / span >   < span class = "preprocessor" > RUN_PASS(1024, 8, DIR); \< / span > < / div >
< div class = "line" > < a name = "l00200" > < / a > < span class = "lineno" > 200< / span >   < span class = "preprocessor" > } \< / span > < / div >
< div class = "line" > < a name = "l00201" > < / a > < span class = "lineno" > 201< / span >   < span class = "preprocessor" > } while (0)< / span > < / div >
< div class = "line" > < a name = "l00202" > < / a > < span class = "lineno" > 202< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00203" > < / a > < span class = "lineno" > 203< / span >   < span class = "keywordflow" > if< / span > (chooseLargest) {< / div >
< div class = "line" > < a name = "l00204" > < / a > < span class = "lineno" > 204< / span >   RUN_PASS_DIR(< span class = "keyword" > true< / span > );< / div >
< div class = "line" > < a name = "l00205" > < / a > < span class = "lineno" > 205< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00206" > < / a > < span class = "lineno" > 206< / span >   RUN_PASS_DIR(< span class = "keyword" > false< / span > );< / div >
< div class = "line" > < a name = "l00207" > < / a > < span class = "lineno" > 207< / span >   }< / div >
< div class = "line" > < a name = "l00208" > < / a > < span class = "lineno" > 208< / span >   < / div >
< div class = "line" > < a name = "l00209" > < / a > < span class = "lineno" > 209< / span >   < span class = "comment" > // unimplemented / too many resources< / span > < / div >
< div class = "line" > < a name = "l00210" > < / a > < span class = "lineno" > 210< / span >   FAISS_ASSERT(< span class = "keyword" > false< / span > );< / div >
< div class = "line" > < a name = "l00211" > < / a > < span class = "lineno" > 211< / span >   < / div >
< div class = "line" > < a name = "l00212" > < / a > < span class = "lineno" > 212< / span >   < span class = "preprocessor" > #undef RUN_PASS_DIR< / span > < / div >
< div class = "line" > < a name = "l00213" > < / a > < span class = "lineno" > 213< / span >   < span class = "preprocessor" > < / span > < span class = "preprocessor" > #undef RUN_PASS< / span > < / div >
< div class = "line" > < a name = "l00214" > < / a > < span class = "lineno" > 214< / span >   < span class = "preprocessor" > < / span > }< / div >
< div class = "line" > < a name = "l00215" > < / a > < span class = "lineno" > 215< / span >   < / div >
< div class = "line" > < a name = "l00216" > < / a > < span class = "lineno" > 216< / span >   } } < span class = "comment" > // namespace< / span > < / div >
< / div > <!-- fragment --> < / div > <!-- contents -->
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