Xgboost Regression, Xgboost, Regression, Boosting, Ensemble Method.
--------------------------------- Similarity Weight = -10^2 / 1 + 1 = 100 /2 λ = 1 Similarity Weight = 50 Similarity Weight of Right Node --------------------------------- Similarity Weight = (-8 + 0 + 8 + 10)^2 / 4 + 1 λ = 1 = 100 / 4 + 1 = 20 // Compute the Similarity Weight of the Root Node,