code: def __contains__(self, name):
      return name in self.__db__
  
imports: from __future__ import absolute_import, print_function, division
  import copy
  import sys
  from theano.compat import DefaultOrderedDict
  from theano.misc.ordered_set import OrderedSet
  from six import StringIO, integer_types
  from theano.gof import opt
  from theano import config
label_desc: Use image node_id 9 for calling the DB obj's underlying member method code with example usage: obj.__contains__(name) and returns: unknown