code: def test_fail(self):
      # Test that conv2d fails for dimensions other than 2 or 3.
  
      self.assertRaises(
          Exception, conv.conv2d, T.dtensor4(), T.dtensor3()
      )
      self.assertRaises(
          Exception, conv.conv2d, T.dtensor3(), T.dvector()
      )
  
file_path: Theano/theano/tensor/signal/tests/test_conv.py
imports: from __future__ import absolute_import, print_function, division
  import unittest
  from nose.plugins.skip import SkipTest
  import numpy
  import theano
  import theano.tensor
  from theano.tests import unittest_tools
  from theano.tensor.signal import conv
  from theano.tensor.basic import _allclose
label_desc: Use image node_id 4 for calling the TestSignalConv2D obj's underlying member method code with example usage: obj.test_fail() without return types