Contributo in atti di convegno, 2012, ENG

Flexible Acquisition of Subcategorization Frames in Italian

Caselli, Tommaso; Frontini, Francesca; Quochi, Valeria; Rubino, Francesco and Russo, Irene

Istituto di Linguistica Computazionale "A. Zampolli", CNR, Italy

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.

Eight International Conference on Language Resources and Evaluation (LREC'12), pp. 2842–2848, Istanbul, Turkey, 23-25 Maggio 2012

Keywords

lexicon, automatic acquisition, subcategorisation frames

CNR authors

Caselli Tommaso, Russo Irene, Frontini Francesca, Rubino Francesco, Quochi Valeria

CNR institutes

ILC – Istituto di linguistica computazionale "Antonio Zampolli"

ID: 287038

Year: 2012

Type: Contributo in atti di convegno

Creation: 2014-11-13 17:10:51.000

Last update: 2015-02-20 17:23:21.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:287038

DBLP: conf/lrec/CaselliRFRQ12

ISI Web of Science (WOS): 000323927702149