Customizable SCF Acquisition in Italian
Tommaso Caselli, Francesco Rubino, Francesca Frontini, Irene Russo, Valeria Quochi
Abstract
Lexica of predicate-argument structures constitute a useful tool for several tasks in NLP. This paper describes a web-service system for automatic acquisition of verb subcategorization frames (SCFs) from parsed data in Italian. The system acquires SCFs in an unsupervised manner. We created two gold standards for the evaluation of the system, the first by mixing together information from two lexica (one manually created and the second automatically acquired) and manual exploration of corpus data and the other annotating data extracted from a specialized corpus (environmental domain). Data filtering is accomplished by means of the maximum likelihood estimate (MLE). The evaluation phase has allowed us to identify the best empirical MLE threshold for the creation of a lexicon (P=0.653, R=0.557, F1=0.601). In addition to this, we assigned to the extracted entries of the lexicon a confidence score based on the relative frequency and evaluated the extractor on domain specific data. The confidence score will allow the final user to easily select the entries of the lexicon in terms of their reliability: one of the most interesting feature of this work is the possibility the final users have to customize the results of the SCF extractor, obtaining different SCF lexica in terms of size and accuracy.- Anthology ID:
- L12-1198
- Volume:
- Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)
- Month:
- May
- Year:
- 2012
- Address:
- Istanbul, Turkey
- Editors:
- Nicoletta Calzolari, Khalid Choukri, Thierry Declerck, Mehmet Uğur Doğan, Bente Maegaard, Joseph Mariani, Asuncion Moreno, Jan Odijk, Stelios Piperidis
- Venue:
- LREC
- SIG:
- Publisher:
- European Language Resources Association (ELRA)
- Note:
- Pages:
- 2842–2848
- Language:
- URL:
- http://www.lrec-conf.org/proceedings/lrec2012/pdf/390_Paper.pdf
- DOI:
- Cite (ACL):
- Tommaso Caselli, Francesco Rubino, Francesca Frontini, Irene Russo, and Valeria Quochi. 2012. Customizable SCF Acquisition in Italian. In Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12), pages 2842–2848, Istanbul, Turkey. European Language Resources Association (ELRA).
- Cite (Informal):
- Customizable SCF Acquisition in Italian (Caselli et al., LREC 2012)
- PDF:
- http://www.lrec-conf.org/proceedings/lrec2012/pdf/390_Paper.pdf