88 lines
2.5 KiB
Plaintext
88 lines
2.5 KiB
Plaintext
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the CC-by-NC 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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// Copyright 2004-present Facebook. All Rights Reserved.
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#pragma once
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#include "Tensor.cuh"
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namespace faiss { namespace gpu {
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template <typename T,
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int Dim,
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bool Contig = false,
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typename IndexT = int,
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template <typename U> class PtrTraits = traits::DefaultPtrTraits>
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class HostTensor : public Tensor<T, Dim, Contig, IndexT, PtrTraits> {
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public:
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typedef IndexT IndexType;
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typedef typename PtrTraits<T>::PtrType DataPtrType;
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/// Default constructor
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__host__ HostTensor();
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/// Destructor
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__host__ ~HostTensor();
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/// Constructs a tensor of the given size, allocating memory for it
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/// locally
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__host__ HostTensor(const IndexT sizes[Dim]);
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__host__ HostTensor(std::initializer_list<IndexT> sizes);
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/// Constructs a tensor of the given size and stride, referencing a
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/// memory region we do not own
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__host__ HostTensor(DataPtrType data,
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const IndexT sizes[Dim]);
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__host__ HostTensor(DataPtrType data,
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std::initializer_list<IndexT> sizes);
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/// Constructs a tensor of the given size and stride, referencing a
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/// memory region we do not own
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__host__ HostTensor(DataPtrType data,
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const IndexT sizes[Dim],
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const IndexT strides[Dim]);
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/// Copies a tensor into ourselves, allocating memory for it
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/// locally. If the tensor is on the GPU, then we will copy it to
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/// ourselves wrt the given stream.
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__host__ HostTensor(Tensor<T, Dim, Contig, IndexT, PtrTraits>& t,
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cudaStream_t stream);
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/// Call to zero out memory
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__host__ HostTensor<T, Dim, Contig, IndexT, PtrTraits>& zero();
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/// Returns the maximum difference seen between two tensors
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__host__ T
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maxDiff(const HostTensor<T, Dim, Contig, IndexT, PtrTraits>& t) const;
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/// Are the two tensors exactly equal?
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__host__ bool
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equal(const HostTensor<T, Dim, Contig, IndexT, PtrTraits>& t) const {
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return (maxDiff(t) == (T) 0);
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}
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private:
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enum AllocState {
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/// This tensor itself owns the memory, which must be freed via
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/// cudaFree
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Owner,
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/// This tensor itself is not an owner of the memory; there is
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/// nothing to free
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NotOwner,
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};
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AllocState state_;
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};
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} } // namespace
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#include "HostTensor-inl.cuh"
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