data_guest_train: "student_hetero_guest"
data_guest_val: "student_hetero_guest"
data_host_train: "student_hetero_host"
data_host_val: "student_hetero_host"
eval_type: "regression"
task_type: "regression"
loss_func: "lse"
tree_depth: 3
tree_num: 50
learning_rate: 0.1