t-272

Results 2 issues of t-272

something wrong about eval_ggcnn.py

![1715248740292](https://github.com/dougsm/ggcnn/assets/151015238/05810be1-226d-4fc2-be77-3a41849e2f1d)

-backend (most likely due to a circular import)

when i run grasp_det_seg_cnn_main,it will use inplace_abn ![微信图片_20240722104715](https://github.com/user-attachments/assets/ac7d0384-19e4-40b9-a9f6-677b4786e3fa)