问题
我这样安装tensorflow：
pip install --upgrade tensorflow
如图： 
原因：安装东西到C盘没有权限
解决方法:添加 --user
pip install --upgrade --user tensorflow-gpu
成功： 
安装成功此时我遇到了下面的警告：WARNING: The scripts estimator_ckpt_converter.exe, import_pb_to_tensorboard.exe, saved_model_cli.exe, tensorboard.exe, tf_upgrade_v2.exe, tflite_convert.exe, toco.exe and toco_from_protos.exe are installed in ‘C:\Users\hp\AppData\Roaming\Python\Python37\Scripts’ which is not on PATH. Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location
解决方法:根据提示把路径C:\Users\hp\AppData\Roaming\Python\Python37\Scripts添加到环境变量即可。
