To compare our approach to earlier efforts, we also used the corpus from<cite> (Perret et al., 2016)</cite> . This corpus was also useful to check for over fitting of our Generative model developed on the multi-modal data. The corpus from<cite> (Perret et al., 2016)</cite> is an early version of a "linguistic only" version of the STAC corpus. It contains no nonlinguistic DUs, unlike the STAC multimodal corpus. 3 It also contains quite a few errors; for example, about 60 stories in the<cite> (Perret et al., 2016)</cite> dataset have no discourse structure in them at all and consist of only one DU.