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NoTypeTensor.cuh
1
2 /**
3 * Copyright (c) 2015-present, Facebook, Inc.
4 * All rights reserved.
5 *
6 * This source code is licensed under the CC-by-NC license found in the
7 * LICENSE file in the root directory of this source tree.
8 */
9
10 // Copyright 2004-present Facebook. All Rights Reserved.
11
12 #pragma once
13
14 #include "../../FaissAssert.h"
15 #include "Tensor.cuh"
16 #include <initializer_list>
17
18 namespace faiss { namespace gpu {
19
20 template <int Dim, bool Contig = false, typename IndexT = int>
21 class NoTypeTensor {
22 public:
23 NoTypeTensor()
24 : mem_(nullptr),
25 typeSize_(0) {
26 }
27
28 template <typename T>
29 NoTypeTensor(Tensor<T, Dim, Contig, IndexT>& t)
30 : mem_(t.data()),
31 typeSize_(sizeof(T)) {
32 for (int i = 0; i < Dim; ++i) {
33 size_[i] = t.getSize(i);
34 stride_[i] = t.getStride(i);
35 }
36 }
37
38 NoTypeTensor(void* mem, int typeSize, std::initializer_list<IndexT> sizes)
39 : mem_(mem),
40 typeSize_(typeSize) {
41
42 int i = 0;
43 for (auto s : sizes) {
44 size_[i++] = s;
45 }
46
47 stride_[Dim - 1] = (IndexT) 1;
48 for (int j = Dim - 2; j >= 0; --j) {
49 stride_[j] = stride_[j + 1] * size_[j + 1];
50 }
51 }
52
53 NoTypeTensor(void* mem, int typeSize, int sizes[Dim])
54 : mem_(mem),
55 typeSize_(typeSize) {
56 for (int i = 0; i < Dim; ++i) {
57 size_[i] = sizes[i];
58 }
59
60 stride_[Dim - 1] = (IndexT) 1;
61 for (int i = Dim - 2; i >= 0; --i) {
62 stride_[i] = stride_[i + 1] * sizes[i + 1];
63 }
64 }
65
66 NoTypeTensor(void* mem, int typeSize,
67 IndexT sizes[Dim], IndexT strides[Dim])
68 : mem_(mem),
69 typeSize_(typeSize) {
70 for (int i = 0; i < Dim; ++i) {
71 size_[i] = sizes[i];
72 stride_[i] = strides[i];
73 }
74 }
75
76 int getTypeSize() const {
77 return typeSize_;
78 }
79
80 IndexT getSize(int dim) const {
81 FAISS_ASSERT(dim < Dim);
82 return size_[dim];
83 }
84
85 IndexT getStride(int dim) const {
86 FAISS_ASSERT(dim < Dim);
87 return stride_[dim];
88 }
89
90 template <typename T>
91 Tensor<T, Dim, Contig, IndexT> toTensor() {
92 FAISS_ASSERT(sizeof(T) == typeSize_);
93
94 return Tensor<T, Dim, Contig, IndexT>((T*) mem_, size_, stride_);
95 }
96
97 NoTypeTensor<Dim, Contig, IndexT> narrowOutermost(IndexT start, IndexT size) {
98 char* newPtr = (char*) mem_;
99
100 if (start > 0) {
101 newPtr += typeSize_ * start * stride_[0];
102 }
103
104 IndexT newSize[Dim];
105 for (int i = 0; i < Dim; ++i) {
106 if (i == 0) {
107 assert(start + size <= size_[0]);
108 newSize[i] = size;
109 } else {
110 newSize[i] = size_[i];
111 }
112 }
113
114 return NoTypeTensor<Dim, Contig, IndexT>(
115 newPtr, typeSize_, newSize, stride_);
116 }
117
118 private:
119 void* mem_;
120 int typeSize_;
121 IndexT size_[Dim];
122 IndexT stride_[Dim];
123 };
124
125 } } // namespace
faiss::gpu::Tensor::data
__host__ __device__ DataPtrType data()
Returns a raw pointer to the start of our data.
Definition: Tensor.cuh:174
faiss::gpu::NoTypeTensor
Definition: NoTypeTensor.cuh:21
faiss::gpu::Tensor::getStride
__host__ __device__ IndexT getStride(int i) const
Definition: Tensor.cuh:228
faiss::gpu::Tensor
Our tensor type.
Definition: Tensor.cuh:31
faiss::gpu::Tensor::getSize
__host__ __device__ IndexT getSize(int i) const
Definition: Tensor.cuh:222