code: def unify_walk(nv, o, U):
      """
      The unification succeeds iff other_object not in NV.not_options.
  
      """
      if o in nv.not_options:
          return False
      else:
          v = BoundVariable("?", o)
          return U.merge(v, nv)
  
imports: from __future__ import absolute_import, print_function, division
  from copy import copy
  from functools import partial
  from theano.gof.utils import ANY_TYPE, comm_guard, FALL_THROUGH, iteritems
label_desc: Use image node_id 6 for calling a global function with example usage: unify_walk(nv, o, U) and returns: False, U