code: def phi(self):
      return (
          self.src_data["Elog"]
          + self.dst_data["Elog"]
          - self.loglike.unsqueeze(1)
      ).exp()
  
imports: import collections
  import functools
  import io
  import os
  import warnings
  import dgl
  import numpy
  import scipy
  import torch
label_desc: Use image node_id 3 for calling the EdgeData obj's underlying member method code with example usage: obj.phi() and returns: unknown