code: def test_f_contiguous_out(self):
      # Same test as test_f_contiguous, but check that it works
      # even if z _is_ the output of the graph
      a = theano.tensor.fmatrix("a")
      b = theano.tensor.fmatrix("b")
      out = BrokenCImplementationAdd()(a, b)
  
      a_val = self.rng.randn(7, 7).astype("float32")
      b_val = self.rng.randn(7, 7).astype("float32")
  
      # Should work
      mode = debugmode.DebugMode(
          check_preallocated_output=["c_contiguous"]
      )
  
      f = theano.function([a, b], out, mode=mode)
      f(a_val, b_val)
      # print 'out_val =', out_val
      # print out_val.strides
  
      # Should raise an Exception, since the output buffer is
      # used incorrectly.
      mode = debugmode.DebugMode(
          check_preallocated_output=["f_contiguous"]
      )
  
      f = theano.function([a, b], out, mode=mode)
  
      if theano.config.cxx:
          self.assertRaises(debugmode.BadThunkOutput, f, a_val, b_val)
      else:
          # The python code of this op is good.
          f(a_val, b_val)
  
imports: from __future__ import absolute_import, print_function, division
  import sys
  import unittest
  from nose.plugins.skip import SkipTest
  import numpy
  from six import reraise
  from theano import config
  from theano import gof
  import theano
  from theano.compat import exc_message
  from theano.compile import debugmode
  import theano.tensor
  from theano.tests import unittest_tools
label_desc: Use image node_id 3 for calling the Test_preallocated_output obj's underlying member method code with example usage: obj.test_f_contiguous_out() without return types