train_and_print_errs   86 samples/cpp/tree_engine.cpp     train_and_print_errs(dtree, data);
train_and_print_errs   98 samples/cpp/tree_engine.cpp         train_and_print_errs(boost, data);
train_and_print_errs  112 samples/cpp/tree_engine.cpp     train_and_print_errs(rtrees, data);