KeyError: 'MadNas is not in the backbone registry'

[kiicool]

File "/data/syj/miniconda3/envs/train2.6/lib/python3.7/site-packages/mmcv/utils/registry.py", line 164, in build_from_cfg
f'{obj_type} is not in the {registry.name} registry')
KeyError: 'MadNas is not in the backbone registry'
detection的训练，在根据readme.md进行操作后出现KeyError，但看起来应该注册过了啊？请问有人能够提供帮助吗