* add ppocrv4 det student and teacher model

* update head and config, refine details

* refine config and head details

* refine config and head details

* refine details

* refine details

* remove application

* refine fpn

* fix bug

* update code

* fix bug

* align lcnet to rec

* align hgnet to rec

* refine make shrink

* remove theseus layer