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the course is from: https://coding.imooc.com/class/chapter/169.html#Anchor
reference： ipynb：https://github.com/mtianyan/Mtianyan-Play-with-Machine-Learning-Algorithms
https://github.com/aintelligen/Mechanical-Learn
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reference： https://www.jianshu.com/p/91365f343585
https://blog.csdn.net/qq_33619378/article/details/83037106
jupyter basic operation：
command：
activate env：activate ml
open jupyter: jupyter notebook
set port: jupyter notebook --port 9999
config workspace：jupyter notebook --generate-config
#c.NotebookApp.notebook_dir = ''
