Update loss.py

python/paddle/nn/functional/loss.py

@@ -1651,10 +1651,8 @@ def cross_entropy(input,
         label = paddle.unsqueeze(label, axis=axis)
     if in_dygraph_mode():
         if soft_label == False:
-            valid_label = paddle.where(
-                label == ignore_index,
-                paddle.zeros_like(label),
-                label)
+            valid_label = paddle.where(label == ignore_index,
+                                       paddle.zeros_like(label), label)
             if len(paddle.nonzero(valid_label < 0)) > 0:
                 invalid_label = paddle.gather_nd(
                     valid_label, paddle.nonzero(valid_label < 0))
@@ -1705,8 +1703,7 @@ def cross_entropy(input,
                 if ignore_weight_mask.ndim > 1 and ignore_weight_mask.shape[
                         -1] == 1:
                     ignore_weight_mask.squeeze_(-1)
-                weight_gather = _C_ops.gather_nd(
-                    weight, valid_label)
+                weight_gather = _C_ops.gather_nd(weight, valid_label)
                 weight_gather = _C_ops.elementwise_mul(weight_gather,
                                                        ignore_weight_mask)
                 input_shape = list(label.shape)