code: def nd(f, x, eps=1e-4):
      return (f(x + eps / 2) - f(x - eps / 2)) / eps
  
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 2 for calling a global function with example usage: nd(f, x, eps) and returns: unknown