Evaluating and Extending the Coverage of HPSG Grammars: A Case Study for German
Jeremy Nicholson, Valia Kordoni, Yi Zhang, Timothy Baldwin, Rebecca Dridan
Abstract
In this work, we examine and attempt to extend the coverage of a German HPSG grammar. We use the grammar to parse a corpus of newspaper text and evaluate the proportion of sentences which have a correct attested parse, and analyse the cause of errors in terms of lexical or constructional gaps which prevent parsing. Then, using a maximum entropy model, we evaluate prediction of lexical types in the HPSG type hierarchy for unseen lexemes. By automatically adding entries to the lexicon, we observe that we can increase coverage without substantially decreasing precision.- Anthology ID:
- L08-1025
- Volume:
- Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)
- Month:
- May
- Year:
- 2008
- Address:
- Marrakech, Morocco
- Editors:
- Nicoletta Calzolari, Khalid Choukri, Bente Maegaard, Joseph Mariani, Jan Odijk, Stelios Piperidis, Daniel Tapias
- Venue:
- LREC
- SIG:
- Publisher:
- European Language Resources Association (ELRA)
- Note:
- Pages:
- Language:
- URL:
- http://www.lrec-conf.org/proceedings/lrec2008/pdf/794_paper.pdf
- DOI:
- Cite (ACL):
- Jeremy Nicholson, Valia Kordoni, Yi Zhang, Timothy Baldwin, and Rebecca Dridan. 2008. Evaluating and Extending the Coverage of HPSG Grammars: A Case Study for German. In Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08), Marrakech, Morocco. European Language Resources Association (ELRA).
- Cite (Informal):
- Evaluating and Extending the Coverage of HPSG Grammars: A Case Study for German (Nicholson et al., LREC 2008)
- PDF:
- http://www.lrec-conf.org/proceedings/lrec2008/pdf/794_paper.pdf