Hi, I think you need to  check the return type and input parameter type to figure out.
eg. _sparse_addmm
‘https://github.com/pytorch/pytorch/blob/dc7cd97402791945648372e0b08961b00a4f5d26/aten/src/ATen/native/sparse/SparseTensorMath.cpp#L930 1’
The output of this function is a strided tensor.