Several supervised dependency parsing algorithms (Nivre and Scholz, 2004;McDonald et al., 2005a;McDonald et al., 2005b;McDonald and Pereira, 2006;Carreras, 2007;Koo and Collins, 2010;Ma and Zhao, 2012; have been proposed and achieved high parsing accuracies on several treebanks, due in large part to the availability of dependency treebanks in a number of languages (McDonald et al., 2013).
the manually annotated treebanks that these parsers rely on are highly expensive to create, in particular when we want to build treebanks for resource-poor languages.