Used within GhosalBoostRF().
boostStage(
rf,
formula = NULL,
train_data = NULL,
pred_data = NULL,
num_trees = num_trees,
min_node_size = NULL,
m_try = NULL,
keep_inbag = TRUE,
intervals = TRUE,
alpha = alpha,
weights = NULL,
num_stages = 2,
prop = prop,
num_threads = num_threads,
variant = NULL
)