Thus, previous studies conduct domain adaptation through selecting relative and informative source data according to the nature of the target domain, via entropy-based methods , Bayesian optimization (Ruder and Plank, 2017), etc.
for NLP, TDS are proved to be effective in various tasks, such as in language modeling (Moore and Lewis, 2010), word segmentation , machine translation (Chen et al., 2016;van der Wees et al., 2017), and multilingual NER (Murthy et al., 2018).