Most of advanced GEC systems are classifierbased (Chodorow et al., 2007;De Felice and Pulman, 2008;Han et al., 2010;Leacock et al., 2010;Tetreault et al., 2010a;Dale and Kilgarriff, 2011) 7 The state-of-the-art result on CoNLL-2014 dataset has been recently advanced by Chollampatt and Ng (2018) (F0.5=54.79) and Grundkiewicz and Junczys-Dowmunt (2018) (F0.5=56.25), which are contemporaneous to this paper.
to the basic seq2seq model in this paper, they used advanced approaches for modeling (e.g., convolutional seq2seq with pre-trained word embedding, using edit operation features, ensemble decoding and advanced model combinations).