异常检测

翻知乎还有各种谷歌，大概总结了一下。

• 統計：
  　▶︎ 3sigma
  　▶︎ grubbs
  　▶︎ boxplot
  　▶︎ z-score
• cluster
• neighborhood
• 密度
• isolation forest
• skyline
  https://earthgecko-skyline.readthedocs.io/en/latest/overview.html
  https://www.digitalocean.com/community/tutorials/how-to-detect-anomalies-with-skyline-on-centos-7
• 时间序列
  　▶︎ 多种算法综述 https://blog.statsbot.co/time-series-anomaly-detection-algorithms-1cef5519aef2
  　▶︎ 同比(Chain)+同比振幅(CA)https://blog.csdn.net/Jasminexjf/article/details/88527966
  　▶︎ STL+GESD http://www.shujuren.org/article/993.html
  　▶︎ S- ESD (Seasonal ESD)与S-H-ESD (Seasonal Hybrid ESD) https://www.cnblogs.com/en-heng/p/9202654.html (edited)