Paper: Accurate Context-Free Parsing with Combinatory Categorial Grammar

ACL ID P10-1035
Title Accurate Context-Free Parsing with Combinatory Categorial Grammar
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2010
Authors

The definition of combinatory categorial grammar (CCG) in the literature varies quite a bit from author to author. How- ever, the differences between the defini- tions are important in terms of the lan- guage classes of each CCG. We prove that a wide range of CCGs are strongly context-free, including the CCG of CCG- bank and of the parser of Clark and Cur- ran (2007). In light of these new results, we train the PCFG parser of Petrov and Klein (2007) on CCGbank and achieve state of the art results in supertagging ac- curacy, PARSEVAL measures and depen- dency accuracy.