On the other hand, data-based methods perform adaptation either by combining in-domain and out-of-domain parallel corpora for supervised adaptation (Luong and Manning, 2015;Freitag and Al-Onaizan, 2016) or by generating pseudo-parallel corpora from indomain monolingual data for unsupervised adaptation (Sennrich et al., 2016a;Currey et al., 2017).
to this end, we compare DALI and Bt on adapting from subtitles to medical domains, where the two largest corpus in subtitles and medical domains have 13.9 and 1.3 million sentences.