GitLab

* [chatgpt] add test checkpoint

* [chatgpt] test checkpoint use smaller model

* [chatgpt] add save/load checkpoint sample code

* [chatgpt] add save/load checkpoint readme

* [chatgpt] refactor save/load checkpoint readme

* [chatgpt] startegy add prepare method

* [chatgpt] refactor examples

* [chatgpt] refactor strategy.prepare

* [chatgpt] support save/load checkpoint

* [chatgpt] fix unwrap actor

* [chatgpt] fix unwrap actor

* [chatgpt]fix train_rm bug with lora

* [chatgpt]support colossalai strategy to train rm

* fix pre-commit

* fix pre-commit 2

* [chatgpt] ppo trainer use default generate args

* [chatgpt] example remove generation preparing fn

* [chatgpt] benchmark remove generation preparing fn

* [chatgpt] fix ci

* [doc] fix typo

* [doc] add invitation