Xgboost Regression, Xgboost, Regression, Boosting, Ensemble Method.
we will construct a binary tree with the condition of ≥ 2.5 and <2.5 in the experience feature according to the second record. Now we can calculate the Similarity Weight. Similarity Weight of Left Node --------------------------------- Similarity Weight = (-10 + -8 )^2 / 2 + 1 = 324 /3 λ = 1