While the hierarchical segmentation received a non-negligible research attention (Yaari 1997; Eisenstein 2009; Du, Buntine, and John-son 2013) , the vast majority of the proposed models (including this work) focus on linear segmentation (Hearst 1994; Beeferman, Berger, and Lafferty 1999; Choi 2000; Brants, Chen, and Tsochantaridis 2002; Misra et al. 2009; Riedl and Biemann 2012; Glavaš, Nanni, and Ponzetto 2016; Koshorek et al. 2018, inter alia) .