https://blog.wongcw.com/2020/01/13/uber-%e9%96%8b%e6%ba%90%e7%94%a8%e6%96%bc%e8%aa%bf%e8%a9%a6ai-%e6%a8%a1%e5%9e%8b%e7%9a%84%e5%8f%af%e8%a6%96%e5%8c%96%e5%b7%a5%e5%85%b7manifold/