Paper: Unbounded Dependency Recovery for Parser Evaluation

ACL ID D09-1085
Title Unbounded Dependency Recovery for Parser Evaluation
Venue Conference on Empirical Methods in Natural Language Processing
Session Main Conference
Year 2009

This paper introduces a new parser eval- uation corpus containing around 700 sen- tences annotated with unbounded depen- dencies, from seven different grammatical constructions. We run a series of off-the- shelfparsersonthecorpustoevaluatehow well state-of-the-art parsing technology is able to recover such dependencies. The overall results range from 25% accuracy to 59%. These low scores call into ques- tion the validity of using Parseval scores as a general measure of parsing capability. We discuss the importance of parsers be- ing able to recover unbounded dependen- cies, given their relatively low frequency in corpora. We also analyse the various er- rors made on these constructions by one of the more successful parsers.