What happens before and after: Multi-Event Commonsense in Event Coreference Resolution
Sahithya Ravi, Chris Tanner, Raymond T. Ng, Vered Shwartz · 2023
Event coreference models cluster event mentions pertaining to the same real-world event.Recent models rely on contextualized representations to recognize coreference among lexically or contextually similar mentions.However, models typically fail to leverage commonsense inferences, which is particularly limiting for resolving lexically-divergent mentions.We propose a model that extends event mentions with temporal commonsense inferences.Given a complex sentence with multiple events, e.g., "The man killed his wife and got arrested", with the target event "arrested", our model generates plausible events that happen before the target event -such as "the police arrived", and after it, such as "he was sentenced".We show that incorporating such inferences into an existing event coreference model improves its performance, and we analyze the coreferences in which such temporal knowledge is required. ① Mention Detection② Baseline Pairwise Scorer (spent, recovering): 0.14 (spent, gunshots): 0.05 (spent, shot): 0.1 (gunshots, shot): 0.82 … gunshots, shot, … recovering hospitalized spent Document 2The third coworker, Bryant Dalton, 39, spent two weeks in the hospital and still is recovering from gunshots to the neck and shoulder, prosecutors said. Document 1Bryant Dalton, 39, was shot in the neck and is hospitalized in good condition.… Document N … (spent, recovering): 0.14 (spent, gunshots): 0.05 (spent, shot): 0.1 (gunshots, shot): 0.82 … ③ Agglomerative Clustering gunshots, shot, … recovering spent, hospitalized spent, recovering, gunshots, shot, hospitalized ② Our Pairwise Scorer (spent, hospitalized): 0.1 (spent, hospitalized): 0.75 f(ctx spent , ctx hospitalized ) f(ctx spent , ctx hospitalized , cs spent , cs hospitalized ,)