code: def spsp_add(A, B):
      """Invoke C++ sparse library for addition"""
      return SparseMatrix(
          torch.ops.dgl_sparse.spsp_add(
              A.c_sparse_matrix, B.c_sparse_matrix
          )
      )
  
file_path: dgl/python/dgl/sparse/elementwise_op_sp.py
imports: from typing import Union
  import torch
  from .sparse_matrix import SparseMatrix, val_like
  from .utils import is_scalar, Scalar
label_desc: Use image node_id 1 for calling a global function with example usage: spsp_add(A, B) and returns: SparseMatrix