In recent years, several supervised entity coreference resolution systems have been proposed, which, according to Ng (2010), can be categorized into three classes -mention-pair models (McCarthy and Lehnert, 1995), entity-mention models (Yang et al., 2008a;Haghighi and Klein, 2010;Lee et al., 2011) and ranking models (Yang et al., 2008b;Durrett and Klein, 2013;Fernandes et al., 2014) -among which ranking models recently obtained state-of-the-art performance.
the manually annotated corpora that these systems rely on are highly expensive to create, in particular when we want to build data for resource-poor languages (Ma and Xia, 2014).