BACT: a Boosting Algorithm for Classification of Trees $Id: index.html 1574 2007-01-26 11:59:13Z taku $; Introduction BACT is a machine learning tool for labeled orderd trees [Kudo & Matsumoto 2004]. The important characteristic is that the input example x is represented not in a numerical feature vector (bag-of-words) but in a labeled ordered tree. Author Taku Kudo Download BACT is free software;