52 lines
2.0 KiB
Plaintext
52 lines
2.0 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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#pragma once
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#include <faiss/gpu/GpuIndicesOptions.h>
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#include <faiss/gpu/utils/Tensor.cuh>
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#include <thrust/device_vector.h>
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// A collection of utility functions for IVFPQ and IVFFlat, for
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// post-processing and k-selecting the results
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namespace faiss { namespace gpu {
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/// Function for multi-pass scanning that collects the length of
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/// intermediate results for all (query, probe) pair
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void runCalcListOffsets(Tensor<int, 2, true>& topQueryToCentroid,
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thrust::device_vector<int>& listLengths,
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Tensor<int, 2, true>& prefixSumOffsets,
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Tensor<char, 1, true>& thrustMem,
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cudaStream_t stream);
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/// Performs a first pass of k-selection on the results
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void runPass1SelectLists(Tensor<int, 2, true>& prefixSumOffsets,
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Tensor<float, 1, true>& distance,
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int nprobe,
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int k,
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bool chooseLargest,
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Tensor<float, 3, true>& heapDistances,
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Tensor<int, 3, true>& heapIndices,
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cudaStream_t stream);
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/// Performs a final pass of k-selection on the results, producing the
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/// final indices
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void runPass2SelectLists(Tensor<float, 2, true>& heapDistances,
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Tensor<int, 2, true>& heapIndices,
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thrust::device_vector<void*>& listIndices,
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IndicesOptions indicesOptions,
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Tensor<int, 2, true>& prefixSumOffsets,
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Tensor<int, 2, true>& topQueryToCentroid,
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int k,
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bool chooseLargest,
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Tensor<float, 2, true>& outDistances,
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Tensor<long, 2, true>& outIndices,
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cudaStream_t stream);
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} } // namespace
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