fix use_softmax=False does not work, test=develop (#32035)

python/paddle/nn/functional/loss.py

@@ -1388,6 +1388,8 @@ def cross_entropy(input,
             "should be '-100', but received %s, which is not allowed." %
             ignore_index)
 
+    softmax_switch = use_softmax
+
     input_dims = len(list(input.shape))
     label_dims = len(list(label.shape))
     if input_dims - 1 != label_dims and input_dims != label_dims:
@@ -1400,7 +1402,7 @@ def cross_entropy(input,
         _, out = core.ops.softmax_with_cross_entropy(
             input, label, 'soft_label', soft_label, 'ignore_index',
             ignore_index, 'numeric_stable_mode', True, 'axis', axis,
-            'use_softmax', use_softmax)
+            'softmax_switch', softmax_switch)
 
         if weight is not None:
 
@@ -1482,7 +1484,7 @@ def cross_entropy(input,
         'ignore_index': ignore_index,
         'numeric_stable_mode': True,
         'axis': axis,
-        'use_softmax': use_softmax
+        'softmax_switch': softmax_switch
     }
     helper = LayerHelper('softmax_with_cross_entropy', **locals())
     softmax = helper.create_variable_for_type_inference(dtype=input.dtype)