[Accuracy diff No.125] Fix accuracy diff for paddle.nn.functional.multi_margin_loss API (#73739)

Author: co63oc

python/paddle/nn/functional/loss.py

@@ -4170,8 +4170,9 @@ def multi_margin_loss(
             )
         weight = paddle.gather(weight, label, axis=0).reshape((-1, 1))
         loss = paddle.mean(
-            paddle.pow(
-                paddle.clip(weight * (margin - index_sample + input), min=0.0),
+            weight
+            * paddle.pow(
+                paddle.clip((margin - index_sample + input), min=0.0),
                 p,
             ),
             axis=1,

test/legacy_test/test_multimarginloss.py

@@ -224,7 +224,7 @@ def calc_multi_margin_loss(
             [weight[label[i]] for i in range(label.size)]
         ).reshape(-1, 1)
         expected = np.mean(
-            np.maximum(weight * (margin + input - index_sample), 0.0) ** p,
+            weight * (np.maximum((margin + input - index_sample), 0.0) ** p),
             axis=1,
         ) - weight * (margin**p / input.shape[1])