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HostTensor.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 "Tensor.cuh"
15
16 namespace faiss { namespace gpu {
17
18 template <typename T,
19 int Dim,
20 bool Contig = false,
21 typename IndexT = int,
22 template <typename U> class PtrTraits = traits::DefaultPtrTraits>
23 class HostTensor : public Tensor<T, Dim, Contig, IndexT, PtrTraits> {
24 public:
25 typedef IndexT IndexType;
26 typedef typename PtrTraits<T>::PtrType DataPtrType;
27
28 /// Default constructor
29 __host__ HostTensor();
30
31 /// Destructor
32 __host__ ~HostTensor();
33
34 /// Constructs a tensor of the given size, allocating memory for it
35 /// locally
36 __host__ HostTensor(const IndexT sizes[Dim]);
37 __host__ HostTensor(std::initializer_list<IndexT> sizes);
38
39 /// Constructs a tensor of the given size and stride, referencing a
40 /// memory region we do not own
41 __host__ HostTensor(DataPtrType data,
42 const IndexT sizes[Dim]);
43 __host__ HostTensor(DataPtrType data,
44 std::initializer_list<IndexT> sizes);
45
46 /// Constructs a tensor of the given size and stride, referencing a
47 /// memory region we do not own
48 __host__ HostTensor(DataPtrType data,
49 const IndexT sizes[Dim],
50 const IndexT strides[Dim]);
51
52 /// Copies a tensor into ourselves, allocating memory for it
53 /// locally. If the tensor is on the GPU, then we will copy it to
54 /// ourselves wrt the given stream.
55 __host__ HostTensor(Tensor<T, Dim, Contig, IndexT, PtrTraits>& t,
56 cudaStream_t stream);
57
58 /// Call to zero out memory
59 __host__ HostTensor<T, Dim, Contig, IndexT, PtrTraits>& zero();
60
61 /// Returns the maximum difference seen between two tensors
62 __host__ T
63 maxDiff(const HostTensor<T, Dim, Contig, IndexT, PtrTraits>& t) const;
64
65 /// Are the two tensors exactly equal?
66 __host__ bool
67 equal(const HostTensor<T, Dim, Contig, IndexT, PtrTraits>& t) const {
68 return (maxDiff(t) == (T) 0);
69 }
70
71 private:
72 enum AllocState {
73 /// This tensor itself owns the memory, which must be freed via
74 /// cudaFree
75 Owner,
76
77 /// This tensor itself is not an owner of the memory; there is
78 /// nothing to free
79 NotOwner,
80 };
81
82 AllocState state_;
83 };
84
85 } } // namespace
86
87 #include "HostTensor-inl.cuh"
faiss::gpu::Tensor::data
__host__ __device__ DataPtrType data()
Returns a raw pointer to the start of our data.
Definition: Tensor.cuh:174
faiss::gpu::HostTensor::zero
__host__ HostTensor< T, Dim, Contig, IndexT, PtrTraits > & zero()
Call to zero out memory.
Definition: HostTensor-inl.cuh:106
faiss::gpu::HostTensor::HostTensor
__host__ HostTensor()
Default constructor.
Definition: HostTensor-inl.cuh:17
faiss::gpu::Tensor::strides
__host__ __device__ const IndexT * strides() const
Returns the stride array.
Definition: Tensor.cuh:248
faiss::gpu::Tensor
Our tensor type.
Definition: Tensor.cuh:31
faiss::gpu::Tensor::sizes
__host__ __device__ const IndexT * sizes() const
Returns the size array.
Definition: Tensor.cuh:243
faiss::gpu::HostTensor
Definition: HostTensor.cuh:23
faiss::gpu::HostTensor::~HostTensor
__host__ ~HostTensor()
Destructor.
Definition: HostTensor-inl.cuh:25
faiss::gpu::HostTensor::equal
__host__ bool equal(const HostTensor< T, Dim, Contig, IndexT, PtrTraits > &t) const
Are the two tensors exactly equal?
Definition: HostTensor.cuh:67
faiss::gpu::HostTensor::maxDiff
__host__ T maxDiff(const HostTensor< T, Dim, Contig, IndexT, PtrTraits > &t) const
Returns the maximum difference seen between two tensors.
Definition: HostTensor-inl.cuh:120