https://blog.stranity.com/2016/09/06/%e7%95%b6%e7%b5%b1%e8%a8%88%e5%ad%b8%e9%81%87%e4%b8%8a%e6%b7%b1%e5%ba%a6%e5%ad%b8%e7%bf%92-regression-analysis-v-s-neural-network/