In recent two decades, a number of scholars have focused on Chinese word extraction for solving CWS or CCWS by dint of various association metrics or a hybrid model of several metrics (Chang and Su, 1997;Chen and Ma, 2002;Luo and Sun, 2003;Ma and Chen, 2003;Feng et al., 2004;Tang et al., 2009;Zhang et al., 2009;Zhang et al., 2010;Duan, Han and Song, 2012;Zhang et al., 2012;Mei et al., 2015;Shen, Kawahara and Kurohashi, 2016).
one big problem for collocation-based methods is that the performance of certain systems will heavily depend on the thresholds setting, because the thresholds for such association metrics are always set heuristically or empirically to gain high performance, which means we have to adjust thresholds with the change of applications or domains with extra effort.