code: def edge_hash(src, dst):
      """edge_hash"""
      return src * 100000007 + dst
  
imports: import sys
  import time
  import copy
  import warnings
  import numpy
  import pgl
  from pgl import graph_kernel
  from pgl.utils.logger import log
label_desc: Use image node_id 3 for calling a global function with example usage: edge_hash(src, dst) and returns: unknown