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#pragma once
#include <c10/util/ArrayRef.h>
#include <c10/util/DimVector.h>
#include <algorithm>
namespace c10 {
// Computes the contiguous strides of a tensor, given its sizes.
inline DimVector contiguous_strides(const IntArrayRef sizes) {
using Int = IntArrayRef::value_type;
const Int dims = static_cast<Int>(sizes.size());
// With this initialisation we get the case dim == 0 or 1 right
DimVector strides(dims, 1);
for (auto i = dims - 2; i >= 0; --i) {
// Strides can't be 0 even if sizes are 0.
strides[i] = strides[i + 1] * std::max(sizes[i + 1], Int{1});
}
return strides;
}
} // namespace c10
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