> For the complete documentation index, see [llms.txt](https://joyous-x.gitbook.io/mbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://joyous-x.gitbook.io/mbook/part-bigdata/catalog-1.md).

# Machine Learn

* [PCA原理推导](https://github.com/joyous-x/mbook/tree/ff8b666028f9aa688f827f913e23e18d0649a9ea/bigdata/derivation_of_PCA.md)