GitLab

* feat: add CosineRestartLrUpdaterHook

* style: rename period to periods

* fix: bug in period 0

* feat: rename eta_min to min_lr and add min_lr_ratio

* docs: fix docstring of restart lr updater

* refactor: use annealing_cos

* docs: add docstring to annealing_cos

* feat: cosine restart lr update hook

* refactor: modify code order for unittest