GitLab

* [chat] strategy refactor unwrap model

* [chat] strategy refactor save model

* [chat] add docstr

* [chat] refactor trainer save model

* [chat] fix strategy typing

* [chat] refactor trainer save model

* [chat] update readme

* [chat] fix unit test

* [chat] refactor lora

* [chat] remove lm class

* [chat] refactor save model

* [chat] refactor train sft

* [chat] fix ci

* [chat] fix ci

* [chatgpt] making experience support dp

* [chatgpt] update example test ci

* [chatgpt] update example test ci

* [chatgpt] update example test ci

* [chatgpt] update example test ci

* [chatgpt] update sampler

* [chatgpt] update example test ci

* [chatgpt] refactor sampler

* [chatgpt] update example test ci

* [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