将yolov8-face里的模型导出到指定opset11

https://github.com/derronqi/yolov8-face

解决办法:

1. 导出前

1 报错内容

• (Tensor input, Tensor weight, Tensor bias, tuple of ints stride, tuple of ints padding, tuple of ints dilation, int groups)
  didn't match because some of the arguments have invalid types: (Tensor, Parameter, NoneType, tuple, tuple, tuple, int)

解决办法： 

pip install torch==1.8.1 torchvision==0.9.1 torchaudio==0.8.1 -i https://pypi.doubanio.com/simple

解决办法来自于：https://github.com/we0091234/yolov8-plate/issues/2

2. 指定版本

pip install ultralytics==8.0.134 -i https://pypi.tuna.tsinghua.edu.cn/simple

版本来自于 ：xxx/yolov8-face/ultralytics/__init__.py

3. 报错内容: AttributeError: Can't get attribute 'StemBlock' on

copy :
xxx\yolov8-face\ultralytics\nn\modules\block.py
xxx\yolov8-face\ultralytics\nn\modules\__init__.py
to :
xxx\anaconda\envs\yolov8\Lib\site-packages\ultralytics\nn\modules\block.py
xxx\anaconda\envs\yolov8\Lib\site-packages\ultralytics\nn\modules\__init__.py