执行pip install mxnet报错，内容如下：
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> numpy
大概意思就是，在安装mxnet时，需要依赖numpy包，检查numpy时发生错误。
检查安装的包 pip list
numpy已安装，尝试不升级依赖安装 pip install mxnet --no-deps， 执行成功
