compitable dcn old api (open-mmlab#405)

Compitable old interface (open-mmlab#404)

* compitable-old-interface

* compitable softnms

* rename

* rename

* use warnings

* upgrade version to 1.0.1

bump version to 1.0.0 (open-mmlab#402)

Bump to rc2 (open-mmlab#401)

* Bump to rc2

* change rc2 -> 1.0.0

use env to control compile op or not (open-mmlab#400)

* use env to control compile op or not

* use str as env var

* update readme

* update rc01

* update readme

Co-authored-by: Kai Chen <[email protected]>

fix syncbn when dist is unavailabel (open-mmlab#388)

bump version to v0.6.2 (open-mmlab#368)

Bump version to v0.6.1 (open-mmlab#361)

bump version to 0.6.0 (open-mmlab#356)

Add optimizer constructor from mmdetection (open-mmlab#313)

* feat: add optimizer constructor

* refactor: version