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