GitLab

* fix: remove all module wrapper when saving checkpoint

* refactor: move position of if

* docs: add docstring

* refactor: add _save_to_state_dict from official torch

* docs: modify docstring of _save_to_state_dict

* docs: modify docstring

* feat: add unittest

* feat: add DataParallel to unittest

* fix: a bug when model has batchnorm

* docs: update docstring