Add RandomCrop in config

[ZegWe]

I'm trying to add a RandomCrop transform in the train pipeline. I modified an example config configs/hrsc2016/s2anet_r50_fpn_3x_hrsc2016.py, and it shown an error

  File "/home/zegwe/s2anet/mmdet/datasets/pipelines/transforms.py", line 337, in __call__
    bboxes = results[key] - bbox_offset
ValueError: operands could not be broadcast together with shapes (1,5) (4,)

I tried to edit line 334 in file mmdet/datasets/pipelines/transforms.py

Before:

            bbox_offset = np.array([offset_w, offset_h, offset_w, offset_h],

After

            bbox_offset = np.array([offset_w, offset_h, 0, 0, 0],

It works with no error now, but trains very slow, maybe the RandomCrop transform costs too much time?

Is there anything I did wrong? And how can I solve it?