code: def elist_input():
      src, dst = edge_pair_input()
      return list(zip(src, dst))
  
imports: import math
  import numbers
  import backend
  import dgl
  import networkx
  import numpy
  import pytest
  import scipy.sparse
  from dgl import DGLError
label_desc: Use image node_id 3 for calling a global function with example usage: elist_input() and returns: list