[Feature] I hope to give a practical tutorial of multi-task learning, and add mmdet and mmseg to the multi-task learning module, thank you

[xqh180110910537]

描述该功能

I hope to give a practical tutorial of multi-task learning, and add mmdet and mmseg to the multi-task learning module, thank you.

是否希望自己实现该功能？

• [ ] 我希望自己来实现这一功能，并向 MMPreTrain 贡献代码！

[Ezra-Yu]

We contacted the author of the MultiTask code section and he is currently writing such a demo as well as documentation