Joint resolution of entity and event coreference

Lee et al. (2012)

From Lee et al. (2012): "limited work that incorporates event-related information in entity coreference, typically by incorporating the verbs in context as features. For instance, Haghighi and Klein (2010) include the governor of the head of nominal mentions as features in their model. Rahman and Ng (2011) also used event-related information by looking at which semantic role the entity mentions can have and the verb pairs of their predicates.

Humphreys et al. (1997) considered entities as well as events, but due to the lack of a corpus annotated with event coreference, their approach was only evaluated implicitly in the MUC-6 template filling task. To our knowledge, the only previous work that considered entity and event coreference resolution jointly is He (2007), but limited to the medical domain and focused on just five semantic categories."

Datasets

Lee et al. (2012) extended the ECB corpus with entity coreference information. The resulting corpus can be downloaded at: http://nlp.stanford.edu/pubs/jcoref-corpus.zip. It is sometimes referred to as "ECB 0.1" (Cybulska and Vossen, 2014, p. 4549).

Statistics of Lee et al.'s corpus (Table 1 in Lee et al. (2012))

	Training	Dev	Test	Total
# Topics	12	3	28	43
# Documents	112	39	331	482
# Entities	459	46	563	1068
# Entity Mentions	1723	259	3465	5447
# Events	300	30	444	774
# Event Mentions	751	140	1642	2533