安装pip、numpy、sklearn

1）pip安装：
https://pip.pypa.io/en/stable/installing/
To install pip, securely download get-pip.py. [1]:
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Inspect get-pip.py for any malevolence. Then run the following:
python get-pip.py
2）python -m pip install numpy
3）python -m pip install scikit-learn