Table 3.

Hyperparameters tuning of XGBoost

Range of hyperparameters	Hyperparameters on ADNI dataset	Hyperparameters on NACC dataset
Booster = gbtree	Booster = gbtree	Booster = gbtree
eta = (0.01: 0.3)	eta = 0.01	eta = 0.01
gamma = (0.5: 1)	gamma = 0.5	gamma = 0.5
max_depth = (5: 8)	max_depth = 5	max_depth = 5
min_child_weight = 1 (default)	min_child_weight = 1	min_child_weight = 1
subsample = 1 (default)	subsample = 1	subsample = 1
colsample_bytree = 1 (default)	colsample_bytree = 1	colsample_bytree = 1
lambda = (1–3)	lambda = 3	lambda = 3
nrounds = (75: 2000)	nrounds = 482	nrounds = 482
scale_pos_weight	scale_pos_weight = (1, 0.62, 3.4)	scale_pos_weight = (1, 2.5, 2)