boost_iterations=10 save_period=0 train_path= model_dir_path= validation_paths= validation_names=validation test_paths= test_names=test booster_type=1 do_reboost=0 bst:num_roots=0 bst:num_feature=3 learning_rate=0.01 min_child_weight=1 min_split_loss=0.1 max_depth=3 reg_lambda=0.1 subsample=1 use_layerwise=0