We also examine the trees learned from different SUMO variants (with different numbers of iterations) in order to establish whether the iterative process yields better structures.
we compared the dependency trees obtained from our model to those produced by a discourse parser (Zhao and Huang, 2017) trained on a corpus which combines annotations from the RST treebank (Carlson et al., 2003) and the Penn Treebank (Marcus et al., 1993).