109 lines
4.2 KiB
Plaintext
109 lines
4.2 KiB
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <faiss/gpu/GpuDistance.h>
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#include <faiss/impl/FaissAssert.h>
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#include <faiss/gpu/GpuResources.h>
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#include <faiss/gpu/impl/Distance.cuh>
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#include <faiss/gpu/utils/ConversionOperators.cuh>
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#include <faiss/gpu/utils/CopyUtils.cuh>
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#include <faiss/gpu/utils/DeviceUtils.h>
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#include <faiss/gpu/utils/DeviceTensor.cuh>
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namespace faiss { namespace gpu {
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void bruteForceKnn(GpuResources* resources,
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faiss::MetricType metric,
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// A region of memory size numVectors x dims, with dims
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// innermost
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const float* vectors,
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bool vectorsRowMajor,
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int numVectors,
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// A region of memory size numQueries x dims, with dims
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// innermost
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const float* queries,
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bool queriesRowMajor,
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int numQueries,
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int dims,
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int k,
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// A region of memory size numQueries x k, with k
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// innermost
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float* outDistances,
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// A region of memory size numQueries x k, with k
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// innermost
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faiss::Index::idx_t* outIndices) {
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auto device = getCurrentDevice();
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auto stream = resources->getDefaultStreamCurrentDevice();
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auto& mem = resources->getMemoryManagerCurrentDevice();
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auto tVectors = toDevice<float, 2>(resources,
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device,
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const_cast<float*>(vectors),
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stream,
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{vectorsRowMajor ? numVectors : dims,
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vectorsRowMajor ? dims : numVectors});
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auto tQueries = toDevice<float, 2>(resources,
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device,
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const_cast<float*>(queries),
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stream,
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{queriesRowMajor ? numQueries : dims,
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queriesRowMajor ? dims : numQueries});
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auto tOutDistances = toDevice<float, 2>(resources,
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device,
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outDistances,
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stream,
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{numQueries, k});
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// FlatIndex only supports an interface returning int indices, allocate
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// temporary memory for it
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DeviceTensor<int, 2, true> tOutIntIndices(mem, {numQueries, k}, stream);
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// Do the work
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if (metric == faiss::MetricType::METRIC_L2) {
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runL2Distance(resources,
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tVectors,
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vectorsRowMajor,
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nullptr, // compute norms in temp memory
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tQueries,
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queriesRowMajor,
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k,
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tOutDistances,
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tOutIntIndices);
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} else if (metric == faiss::MetricType::METRIC_INNER_PRODUCT) {
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runIPDistance(resources,
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tVectors,
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vectorsRowMajor,
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tQueries,
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queriesRowMajor,
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k,
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tOutDistances,
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tOutIntIndices);
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} else {
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FAISS_THROW_MSG("metric should be METRIC_L2 or METRIC_INNER_PRODUCT");
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}
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// Convert and copy int indices out
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auto tOutIndices = toDevice<faiss::Index::idx_t, 2>(resources,
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device,
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outIndices,
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stream,
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{numQueries, k});
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// Convert int to idx_t
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convertTensor<int, faiss::Index::idx_t, 2>(stream,
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tOutIntIndices,
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tOutIndices);
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// Copy back if necessary
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fromDevice<float, 2>(tOutDistances, outDistances, stream);
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fromDevice<faiss::Index::idx_t, 2>(tOutIndices, outIndices, stream);
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}
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} } // namespace
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