Deep Multitask Learning for Semantic Dependency Parsing
Table 5: Pairwise structural similarities between the three formalisms in unlabeled F1 score. Scores from Oepen et al. (2015).
['[EMPTY]', 'Undirected  [BOLD] DM', 'Undirected  [BOLD] PAS', 'Undirected  [BOLD] PSD', 'Directed  [BOLD] DM', 'Directed  [BOLD] PAS', 'Directed  [BOLD] PSD']
DM and PAS are more structurally similar to each other than either is to PSD. All three formalisms have more than 50% overlap when ignoring arcs’ directions, but considering direction, PSD is clearly different; PSD reverses the direction about half of the time it shares an edge with another formalism.