better error messages

theano/tensor/tests/test_rop.py

@@ -121,7 +121,9 @@ class test_RopLop(unittest.TestCase):
 
         v1 = rop_f(vx,vv)
         v2 = scan_f(vx,vv)
-        assert numpy.allclose(v1,v2)
+
+        assert numpy.allclose(v1,v2), ('ROP mismatch: %s %s' % (v1, v2))
+
         self.check_nondiff_rop( theano.clone(y,
                                              replace={self.mx:break_op(self.mx)}))
 
@@ -136,7 +138,8 @@ class test_RopLop(unittest.TestCase):
 
         v1 = lop_f(vx,vv)
         v2 = scan_f(vx,vv)
-        assert numpy.allclose(v1,v2)
+        assert numpy.allclose(v1,v2), ('LOP mismatch: %s %s' % (v1, v2))
+
 
 
     def check_rop_lop(self, y, out_shape):