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ecde870d4e
This PR moves `ATen/core/DimVector.h`, as suggested in: https://github.com/pytorch/pytorch/pull/76812#discussion_r866875924 The changes can be summarized as: - Changing includes from `ATen/core/DimVector.h` to `c10/util/DimVector.h` - Re-declaring both the type and constant size in `at` namespace - Making `c10::contiguous_strides` return a `DimVector` Pull Request resolved: https://github.com/pytorch/pytorch/pull/77045 Approved by: https://github.com/peterbell10, https://github.com/ezyang
28 lines
699 B
C++
28 lines
699 B
C++
#pragma once
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#include <c10/util/ArrayRef.h>
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#include <c10/util/DimVector.h>
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namespace c10 {
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// Computes the contiguous strides of a tensor, given its sizes.
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static inline DimVector contiguous_strides(const IntArrayRef sizes) {
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using Int = IntArrayRef::value_type;
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const Int dims = static_cast<Int>(sizes.size());
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DimVector strides;
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if (dims > 0) {
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strides.assign(dims, 0);
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// Start by populating the last dimension: its strides is always 1.
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strides[dims - 1] = 1;
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for (auto i = dims - 2; i >= 0; --i) {
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// Strides can't be 0 even if sizes are 0.
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strides[i] = strides[i + 1] * std::max(sizes[i + 1], Int{1});
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}
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}
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return strides;
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}
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} // namespace c10
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