导数
机器学习
http://www.ai-start.com/ml2014/
https://github.com/fengdu78/lihang-code.git
https://github.com/datawhalechina/pumpkin-book/tree/master/docs
https://datawhalechina.github.io/pumpkin-book/
https://github.com/Doraemonzzz/Learning-from-data
https://www.cainiaojc.com/matlab/matlab-matrics.html
https://www.tensorflow.org/tutorials