code: def apply_edge(self, x_j, norm_i, norm_j):
      return norm_i * norm_j * x_j
  
file_path: euler/tf_euler/python/convolution/sgcn_conv.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
  from tf_euler.python.convolution import conv
  from tf_euler.python.euler_ops import mp_ops
label_desc: Use image node_id 4 for calling the SGCNConv obj's underlying member method code with example usage: obj.apply_edge(x_j, norm_i, norm_j) and returns: unknown