code: def mul_add_simplify(expr):
      """Turns Mul(Add(.), .) into Add(Mul(.), Mul(.),...)"""
      if expr[0] != "#Mul":
          return None
      for i in range(1, len(expr)):
          if expr[i][0] == "#Add":
              other_args = expr[1:i] + expr[i + 1 :]
              return ("#Add",) + tuple(
                  (("#Mul",) + other_args + (j,) for j in expr[i][1:])
              )
  
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 13 for calling a global function with example usage: mul_add_simplify(expr) and returns: None, unknown