class_docstr: A symbolic input needed to compute the outputs is missing.
class_docstr_tok: ["A","symbolic","input","needed","to","compute","the","outputs","is","missing","."]
code: def __init__(self, *args, **kwargs):
      if kwargs:
          # The call to list is needed for Python 3
          assert list(kwargs.keys()) == ["variable"]
          error_msg = get_variable_trace_string(kwargs["variable"])
          if error_msg:
              args = args + (error_msg,)
      s = "\n".join(args)  # Needed to have the new line print correctly
      Exception.__init__(self, s)
  
imports: from __future__ import absolute_import, print_function, division
  from collections import OrderedDict
  import time
  import theano
  from theano.gof import graph
  from theano.gof import utils
  from theano.gof import toolbox
  from theano import config
  from six import iteritems, itervalues
  from six.moves import StringIO
  from theano.gof.utils import get_variable_trace_string
  from theano.misc.ordered_set import OrderedSet
label_desc: Use image node_id 1 to create a new MissingInputError object from inherited base classes: Exception with example: obj = MissingInputError()