code: def __str__(self):
      s = "WrongValue\n"
      return s + str_diagnostic(
          self.val1, self.val2, self.rtol, self.atol
      )
  
imports: from __future__ import absolute_import, print_function, division
  from copy import copy, deepcopy
  from functools import wraps
  import logging
  import sys
  import unittest
  from parameterized import parameterized
  from nose.tools import assert_raises
  from six import integer_types
  from six.moves import StringIO
  import numpy
  import theano
  import theano.tensor
  from theano import config
label_desc: Use image node_id 2 for calling the WrongValue obj's underlying member method code with example usage: obj.__str__() and returns: unknown