Much of the research on ED has been based on the specifications of the 2005 ACE [Automatic Content Extraction] event task 1 , and the associated annotated corpus.
regarding the correctness criteria, following the previous work (Ji and Grishman, 2008;Liao and Grishman, 2010;Ji and Grishman, 2011;Li et al., 2013), a trigger candidate is counted as correct if its event subtype and offsets match those of a reference trigger.