code: def copy_e(g, x):
      r"""Generalized SDDMM function that copies destination node features to edges."""
      return x
  
file_path: dgl/python/dgl/ops/sddmm.py
imports: import sys
  from itertools import product
  from ..None import backend
  from ..backend import gsddmm, gsddmm_hetero
label_desc: Use image node_id 7 for calling a global function with example usage: copy_e(g, x) and returns: x