Paper: Enhancing Performance of Lexicalised Grammars

ACL ID P08-1070
Title Enhancing Performance of Lexicalised Grammars
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2008

This paper describes how external resources can be used to improve parser performance for heavily lexicalised grammars, looking at both robustness and efficiency. In terms of robust- ness, we try using different types of external data to increase lexical coverage, and find that simple POS tags have the most effect, increas- ingcoverageonunseendatabyupto45%. We also show that filtering lexical items in a su- pertagging manner is very effective in increas- ingefficiency. EvenusingvanillaPOStagswe achieve some efficiency gains, but when us- ingdetailedlexicaltypesassupertagsweman- age to halve parsing time with minimal loss of coverage or precision.