1#pragma once
2#include <c10/util/ArrayRef.h>
3#include <c10/util/DimVector.h>
4
5namespace c10 {
6
7// Computes the contiguous strides of a tensor, given its sizes.
8static inline DimVector contiguous_strides(const IntArrayRef sizes) {
9 using Int = IntArrayRef::value_type;
10 const Int dims = static_cast<Int>(sizes.size());
11
12 // With this intialisation we get the case dim == 0 or 1 right
13 DimVector strides(dims, 1);
14
15 for (auto i = dims - 2; i >= 0; --i) {
16 // Strides can't be 0 even if sizes are 0.
17 strides[i] = strides[i + 1] * std::max(sizes[i + 1], Int{1});
18 }
19
20 return strides;
21}
22
23} // namespace c10
24