[Coati] Train DPO using PP (#6054)

* update dpo

* remove unsupport plugin

* update msg

* update dpo

* remove unsupport plugin

* update msg

* update template

* update dataset

* add pp for dpo

* update dpo

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* add dpo fn

* update dpo

* update dpo

* update dpo

* update dpo

* minor update

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



* update loss

* update help

* polish code

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>