torch.sspaddmm
torch.sspaddmm(input, mat1, mat2, *, beta=1, alpha=1, out=None) -> Tensor
Matrix multiplies a sparse tensor "mat1" with a dense tensor
   "mat2", then adds the sparse tensor "input" to the result.
Note: This function is equivalent to "torch.addmm()", except
   "input" and "mat1" are sparse.
Parameters:
      * input (Tensor) -- a sparse matrix to be added
  * **mat1** (*Tensor*) -- a sparse matrix to be matrix multiplied

  * **mat2** (*Tensor*) -- a dense matrix to be matrix multiplied

Keyword Arguments:
      * beta (Number, optional) -- multiplier for "mat"
        (\beta)
  * **alpha** (*Number**, **optional*) -- multiplier for mat1 @
    mat2 (\alpha)

  * **out** (*Tensor**, **optional*) -- the output tensor.
