code: def avg(x, y):
      return (x + y) / 2
  
file_path: autograd/examples/print_trace.py
imports: from __future__ import print_function
  import autograd.numpy
  from autograd.tracer import trace, Node
  from autograd import grad
label_desc: Use image node_id 3 for calling a global function with example usage: avg(x, y) and returns: unknown