如何降级TensorFlow

总是安装失败_

(base) E:\爬虫\电影评论>pip install tensorflow2.2.0
Collecting tensorflow2.2.0
Downloading tensorflow-2.2.0-cp37-cp37m-win_amd64.whl (459.2 MB)
|████ | 53.9 MB 75 kB/s eta 1:29:39ERROR: Exception:
Traceback (most recent call last):
File “d:\anaconda\lib\site-packages\pip_vendor\resolvelib\resolvers.py”, line 171, in _merge_into_criterion
crit = self.state.criteria[name]
KeyError: ‘tensorflow’

使用清华源下载

pip install tensorflow==2.2.0 -i https://pypi.doubanio