Botao Ren

Results 2 issues of Botao Ren

### What's the feature? in mmrotate/mmrotate/core/bbox/coder/delta_xywha_rbbox_coder.py, line 264, why using pa rather than ga, I think maybe ga is more precise than pa~ ### Any other context? _No response_

Hi, I'm appreciate your work so much, but I still have one question. The pretrain model of ReResnet50 you given is re_resnet50_c8_batch256-25b16846, but the pretrain model in dota v1.5 config...