Here is the collection of my notes Principle Component Analysis and Proper Orthogonal Decomposition Variotional Autoencoder Support Vector Machine Decision Tree and Random_Forest and XGBoost Functional_derivative_and_AC_eq_and_CH_eq Here is the collection of some interesting websites China Online Museum Website A Free Interactive Simulations for Science and Math Website Mathematics Genealogy Project 中国慕课网 古诗文网 Chinese Classical Poetry Website A great website for learning Chinese