First, Miwa and Bansal (2016) rely on external syntactic parsers for obtaining syntactic information, which is crucial for relation extraction (Culotta and Sorensen, 2004;Zhou et al., 2005;Bunescu and Mooney, 2005;Qian et al., 2008).
parsing errors can lead to encoding inaccuracies of tree-LSTMs, thereby hurting relation extraction potentially.