can not find _BatchNorm in mmengine

[lsj1111]

Prerequisite

• I have searched Issues and Discussions but cannot get the expected help.
• The bug has not been fixed in the latest version(https://github.com/open-mmlab/mmcv).

Environment

mmcv 2.0.1

Reproduces the problem - code sample

from mmcv.utils import (IS_NPU_AVAILABLE, _BatchNorm,
)

Reproduces the problem - command or script

In the mmcv1.x , the method of _BatchNorm is in the mmcv.utils,but now in the mmcv 2.x ,it does not exist,and i can't find it in the mmengine

Reproduces the problem - error message

ImportError: cannot import name 'BatchNorm' from 'mmcv.utils' (D:\Tool\Anaconda\Anaconda\envs\openmmlab\lib\site-packages\mmcv\utils_init.py)

Additional information

In the mmcv1.x , the method of _BatchNorm is in the mmcv.utils,but now in the mmcv 2.x ,it does not exist,and i can't find it in the mmengine