For dialogues with multiple interlocutors, extraction of their discourse structures provides useful semantic infor-mation to the "downstream" models used, for example, in the production of intelligent meeting managers or the analysis of user interactions in online fora.
despite considerable efforts to retrieve discourse structures automatically (Fisher and Roark, 2007;Duverle and Prendinger, 2009;Li et al., 2014;Joty et al., 2013;Ji and Eisenstein, 2014;Yoshida et al., 2014;Li et al., 2014;Surdeanu et al., 2015), we are still a long way from usable discourse models, especially for dialogue.