For the former, we simply concatenate the contextual signals to get current turn feature vector, i.e.
for IC task and conditional random fields (CRF) for SL task (Jeong and Lee, 2008;Wang1 et al., 2002;Raymond and Riccardi, 2007), more recent approaches rely on deep neural networks to jointly model IC and SL tasks (Yao et al., 2014a,b;Guo et al., 2014;Zhang and Wang, 2016;Liu and Lane, 2016c;Goo et al., 2018).