code: def add_add_simplify(expr):
      return commutative_simplify(expr, "#Add")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import tensorflow
label_desc: Use image node_id 15 for calling a global function with example usage: add_add_simplify(expr) and returns: commutative_simplify