code: def grad(fun, x):
      vjp, _ = make_vjp(fun, x)
      return vjp(1.0)
  
imports: from __future__ import absolute_import
  import warnings
  from autograd.core import make_vjp
  from autograd.wrap_util import unary_to_nary
label_desc: Use image node_id 1 for calling a global function with example usage: grad(fun, x) and returns: vjp