Source of PrincipalCurve

TITLE:Principal Curve
[[Math]] > [[PCA]] > [[PrincipalCurve]]

- [https://omedstu.jimdo.com/2019/09/29/principal-curve-%E5%85%A5%E9%96%80/ https://omedstu.jimdo.com/2019/09/29/principal-curve-入門]
- [https://omedstu.jimdo.com/2019/10/06/python%E3%81%AB%E3%82%88%E3%82%8Bprincipal-curve%E3%81%AE%E5%AE%9F%E8%A3%85-bending%E3%82%A2%E3%83%AB%E3%82%B4%E3%83%AA%E3%82%BA%E3%83%A0/ https://omedstu.jimdo.com/2019/10/06/pythonによるprincipal-curveの実装-bendingアルゴリズム]