code: def _variable_is_none(var):
      return isinstance(var, theano.Constant) and var.data is None
  
imports: from __future__ import absolute_import, print_function, division
  import numpy
  import theano
  from theano.tensor.basic import mul, arange
  from theano.gradient import grad_undefined
  from theano.tensor.subtensor import set_subtensor
label_desc: Use image node_id 1 for calling a global function with example usage: _variable_is_none(var) and returns: unknown