fix ut

python/paddle/fluid/tests/unittests/test_split_op.py

@@ -19,6 +19,7 @@ from op_test import OpTest
 
 class TestSplitOp(OpTest):
     def setUp(self):
+        self._set_op_type()
         axis = 1
         x = np.random.random((4, 5, 6)).astype('float32')
         out = np.split(x, [2, 3], axis)