To effectively perform CWS and POS tagging, combining them into a joint task is proved to have better performance than separately conducting the two tasks in a sequence (Ng and Low, 2004).
many studies were proposed in the past decade for joint CWS and POS tagging (Jiang et al., 2008, 2009; Sun, 2011; Zeng et al., 2013; Zheng et al., 2013; Kurita et al., 2017; Shao et al., 2017; Zhang et al., 2018).