fix errors in tests

theano/tensor/nnet/tests/test_abstract_conv.py

@@ -1709,7 +1709,6 @@ class Grouped_conv_noOptim(unittest.TestCase):
         self.kern_shape = (6, 2, 3, 3)
         self.top_shape = (5, 6, 3, 3)
         self.filter_dilation = (1, 1)
-        self.num_groups = 3
         self.mode = theano.Mode(optimizer=None)
 
     def test_fwd(self):