1_XGBoost原理
\[ \begin{align} X\!G\!Boost&=eXtreme+GBDT\ &=eXtreme+(Gradient+BDT) \ &=eXtreme+Gradient+(Boosting+DecisionTree) \end{align} \]\[ \begin{align} X\!G\!Boost&=eXtreme
\[ \begin{align} X\!G\!Boost&=eXtreme+GBDT\ &=eXtreme+(Gradient+BDT) \ &=eXtreme+Gradient+(Boosting+DecisionTree) \end{align} \]\[ \begin{align} X\!G\!Boost&=eXtreme