使用阿里云镜像安装tensorflow
pip --default-timeout=1000 install --index-url https://mirrors.aliyun.com/pypi/simple tensorflow
pip --default-timeout=1000 install --index-url https://mirrors.aliyun.com/pypi/simple tensorflow==2.7.0
pip install -i https://mirrors.aliyun.com/pypi/simple tensorflow
pip install tensorflow==2.7.0 -i https://pypi.tuna.tsinghua.edu.cn/simple