cherry-pick add deprecated for softmax_with_cross_entropy #31953
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PR types
Function optimization
PR changes
APIs
Describe
1、softmax_with_cross_entropy是历史原因保留的api,2.0下并不推荐用户使用,所以增加打印deprecated警告
2、完善nn/functional/loss.py中cross_entropy的英文文档
3、完善nn/layer/loss.py中CrossEntropyLoss的英文文档
4、修复softlabel为true,并指定weight参数时cross_entropy报错问题
5、python端加开关softmax_switch