完整的ipynb分析流程，请点击以下连接：
https://nbviewer.jupyter.org/github/China-LuoYaxiong/ipynb/blob/master/Scikit%20Learn%E4%B9%8BPCA%E9%99%8D%E7%BB%B4%EF%BC%88%E4%B8%BB%E6%88%90%E5%88%86%E5%88%86%E6%9E%90%EF%BC%89.ipynb
上面的连接是需要外站的渲染，打不开，那就查看下面这个ipynb长图：
https://www.cnblogs.com/LUOyaXIONG/gallery/image/259967.html