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IVFUtils.cuh
1 /**
2 * Copyright (c) 2015-present, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under the CC-by-NC license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9 // Copyright 2004-present Facebook. All Rights Reserved.
10
11 #pragma once
12
13 #include "../GpuIndicesOptions.h"
14 #include "../utils/Tensor.cuh"
15 #include <thrust/device_vector.h>
16
17 // A collection of utility functions for IVFPQ and IVFFlat, for
18 // post-processing and k-selecting the results
19 namespace faiss { namespace gpu {
20
21 /// Function for multi-pass scanning that collects the length of
22 /// intermediate results for all (query, probe) pair
23 void runCalcListOffsets(Tensor<int, 2, true>& topQueryToCentroid,
24 thrust::device_vector<int>& listLengths,
25 Tensor<int, 2, true>& prefixSumOffsets,
26 Tensor<char, 1, true>& thrustMem,
27 cudaStream_t stream);
28
29 /// Performs a first pass of k-selection on the results
30 void runPass1SelectLists(Tensor<int, 2, true>& prefixSumOffsets,
31 Tensor<float, 1, true>& distance,
32 int nprobe,
33 int k,
34 bool chooseLargest,
35 Tensor<float, 3, true>& heapDistances,
36 Tensor<int, 3, true>& heapIndices,
37 cudaStream_t stream);
38
39 /// Performs a final pass of k-selection on the results, producing the
40 /// final indices
41 void runPass2SelectLists(Tensor<float, 2, true>& heapDistances,
42 Tensor<int, 2, true>& heapIndices,
43 thrust::device_vector<void*>& listIndices,
44 IndicesOptions indicesOptions,
45 Tensor<int, 2, true>& prefixSumOffsets,
46 Tensor<int, 2, true>& topQueryToCentroid,
47 int k,
48 bool chooseLargest,
49 Tensor<float, 2, true>& outDistances,
50 Tensor<long, 2, true>& outIndices,
51 cudaStream_t stream);
52
53 } } // namespace