With respect to the emission and transition score matrices E i,y i and A y i ,y i+1 , we adopt an upper bound between source/target domains, which helps the target domain predictor to be guided by the source domain predictor.
in this paper, we focus on medical NER from EHRs, which is a fundamental task and is widely studied in the research community (Nadeau and Sekine, 2007;Uzuner et al., 2011).