Publication
Adaptability of Lexical Acquisition for Large-scale Grammars
Kostadin Cholakov; Gertjan van Noord; Valia Kordoni; Yi Zhang
In: Ruslan Mitkov (Hrsg.). Proceedings of RANLP 2011. International Conference on Recent Advances in Natural Language Processing (RANLP-2011), September 12-14, Hissar, Bulgaria, RANLP, 9/2011.
Abstract
In this paper, we demonstrate the portability
of the lexical acquisition (LA) method
proposed in Cholakov and van Noord
(2010a). Here, LA refers to the acquisition
of linguistic descriptions for words
which are not listed in the lexicon of a
given computational grammar, i.e., words
which are unknown to this grammar. The
method we discuss was originally developed
for the Dutch Alpino system, and the
paper shows that the method also applies
to the GG (Crysmann, 2003), a computational
HPSG grammar of German. The
LA method obtains very similar results for
German (84% F-measure on learning unknown
words). Extending the GG with the
lexical entries proposed by the LA method
causes an important improvement in parsing
accuracy for a test set of sentences containing
unknown words. Furthermore, in
a smaller experiment, we show that the
linguistic knowledge the LA method provides
can also be used for sentence generation.