refine huber loss unittest, test=develop (#24263)

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

@@ -89,14 +89,17 @@ class TestHuberLossOpError(unittest.TestCase):
             xr = fluid.data(name='xr', shape=[None, 6], dtype="float32")
             lw = np.random.random((6, 6)).astype("float32")
             lr = fluid.data(name='lr', shape=[None, 6], dtype="float32")
-            self.assertRaises(TypeError, fluid.layers.huber_loss, xw, lr)
-            self.assertRaises(TypeError, fluid.layers.huber_loss, xr, lw)
+            delta = 1.0
+            self.assertRaises(TypeError, fluid.layers.huber_loss, xr, lw, delta)
+            self.assertRaises(TypeError, fluid.layers.huber_loss, xw, lr, delta)
 
             # the dtype of input and label must be float32 or float64
             xw2 = fluid.data(name='xw2', shape=[None, 6], dtype="int32")
             lw2 = fluid.data(name='lw2', shape=[None, 6], dtype="int32")
-            self.assertRaises(TypeError, fluid.layers.huber_loss, xw2, lr)
-            self.assertRaises(TypeError, fluid.layers.huber_loss, xr, lw2)
+            self.assertRaises(TypeError, fluid.layers.huber_loss, xw2, lr,
+                              delta)
+            self.assertRaises(TypeError, fluid.layers.huber_loss, xr, lw2,
+                              delta)
 
 
 if __name__ == '__main__':