Xgboost Regression, Xgboost, Regression, Boosting, Ensemble Method.
Right tree Right Node --------------------------------- Similarity Weight = (0 + 8)^2 / 2 + 1 λ = 1 = 64 / 3 = 21.3 // Compute the Similarity Weight of the Root Node, Similarity Weight = (0 + 8 + 10)^2 / 3 + 1 λ = 1 = 324 / 3 + 1 = 81 // Calculate the Information Gain Similarity Weight of Left Node