There have been some feature-based studies (Ji and Grishman, 2008;Liao and Grishman, 2010;Huang and Riloff, 2012) that construct rules to capture document-level information for improving sentence-level ED.
they suffer from two problems: (1) The features they used often need to be manually designed and may involve error propagation from existing NLP tools; (2) Sentence-level and document-level information are integrated by a large number of fixed rules, which is complicated to construct and it will be far from complete.