TypeError: SemiDataset: __init__() got an unexpected keyword argument '_delete_'

[mingtianyidingtian]

Traceback (most recent call last):
File "D:\ProgramData\anaconda3\envs\consistentteacher\lib\site-packages\mmcv\utils\registry.py", line 69, in build_from_cfg
return obj_cls(**args)
File "D:\project\ConsistentTeacher\ssod\datasets\dataset_wrappers.py", line 9, in init
super().init([build_dataset(sup), build_dataset(unsup)], **kwargs)
TypeError: init() got an unexpected keyword argument 'delete'