[hot-fix] Fix memory leakage bug, support TP+PP (#6258)

* update help information

* update style

* fix

* minor fix

* support PP training

* add pp support

* remove unused code

* address conversation

* fix memory leakage support tp+pp

* move empty cache

* move empty cache

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Co-authored-by: Tong Li <tong.li35271158@gmail.com>