code: def test_sub():
      check_binary_func(lambda x, y: x - y)
  
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 6 for calling a global function with example usage: test_sub() without return types