where to get the box feature? the bbox_file is empty. how to gererate the box feature from image?

[ekma000]

` elif cfg.MODEL.BUA.EXTRACTOR.MODE == 3: # extract roi features by bbox
npy = False
bbox_path = os.path.join(args.bbox_dir, im_file.split('.')[0])
if os.path.exists(bbox_path + '.npy'):
npy = True
bbox_file = bbox_path + '.npy'
elif os.path.exists(bbox_path + '.npz'):
bbox_file = bbox_path + '.npz'
else:
continue

        try:
            if npy:
                bbox = torch.from_numpy(np.load(bbox_file, allow_pickle=True).tolist()['bbox']) * dataset_dict['im_scale']
            else:
                bbox = torch.from_numpy(np.load(bbox_file)['bbox']) * dataset_dict['im_scale']
        except Exception as e:
            print(e)
            continue`

where to get the box feature? the bbox_file is empty. how to gererate the box feature from image?