* Enhance config

* add unit test data

* Refacotr unitest of checkpointhook

* add comments

* Fix unit test

* remove _get_metric_scope

* tmp save

* Revert "remove _get_metric_scope"

This reverts commit eeb7a8c5ed2766bf773a9ed28f731fddacd10ac1.

* Revert "Revert "remove _get_metric_scope""

This reverts commit 5398255f6fb3dac8341f7d808f0d7d09350fcaae.

* Revert "tmp save"

This reverts commit cdc9919be8e0a78bbf264c060de2a4396c137d5a.

* clean the code

* Fix ut

* minor fix

* use str.replace