DC

Results 2 issues of DC

**Describe the feature** Hello MMRotate team, thank you for your great work, I am wondering if there is plan to implement CPU inference for `RiRoIAlignRotated`, just like `RoIAlignRotated` **Motivation** ![cpu_err1](https://user-images.githubusercontent.com/40515271/156175173-baf9952a-e1f0-4178-a00e-c22b2b7442a5.png)...

Hard
feature

Hello @csuhan, Thank you very much for sharing your great work! I am wondering if ReDet is supporting inference with only CPU? If it is supporting, how should we do...