[Feature] Migration to OpenMMLab 2.0 framework.

[tonysy]

Describe the feature

Hi, OpenMixup Team.

We have release the OpenMMLab 2.0 framework, and release the new version of MMClassification and MMSelfSup.

We also introduce the new features in these two blogs.

• https://zhuanlan.zhihu.com/p/574842341
• https://zhuanlan.zhihu.com/p/573317958

If you think the new features are useful to your project, feel free to try or migrate to OpenMMLab 2.0 framework.

MMClassification/MMSelfSup Team.

[Lupin1998]

Hi @tonysy, thanks for your advice and sincere invitation. We have noticed the OpenMMLab 2.0 framework and found it very useful. 👍 Currently, we are learning from the new version of MMClassification and MMSelfsup, and we plan to start updating the new features in the OpenMMLab 2.0 framework at the end of this year.