Summary of knowledge points of catboost

Last study catboost Still fast 2 Years ago , Look at the previous notes today , So do some sorting .
CatBoost： Three characteristics
（1） Achieve orderly improvement , Permutation driven to replace classical algorithms ;
（2） A novel algorithm to deal with categorical variables .
Both of these techniques are designed to combat the prediction offset caused by a special type of target leakage , This leakage exists in the implementation of all gradient enhancement algorithms .
（3） Use symmetric binary tree , Speed up the calculation