Automatic treebank-based acquisition of Arabic LFG dependency structures
Tounsi, Lamia and Attia, Mohammed and van Genabith, Josef (2009) Automatic treebank-based acquisition of Arabic LFG dependency structures. In: EACL 2009 Workshop on Computational Approaches to Semitic Languages, 31 March 2009, Athens, Greece.
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A number of papers have reported on methods for the automatic acquisition of large-scale, probabilistic LFG-based grammatical resources from treebanks for English (Cahill and al., 2002), (Cahill and al., 2004), German (Cahill and al., 2003), Chinese (Burke, 2004), (Guo and al.,
2007), Spanish (O’Donovan, 2004), (Chrupala and van Genabith, 2006) and French (Schluter and van Genabith, 2008). Here, we extend the LFG grammar acquisition approach to Arabic and the Penn Arabic Treebank (ATB) (Maamouri and
Bies, 2004), adapting and extending the methodology
of (Cahill and al., 2004) originally developed for English. Arabic is challenging because of its morphological richness and syntactic complexity.
Currently 98% of ATB trees (without FRAG and X) produce a covering and connected f-structure.
We conduct a qualitative evaluation of our annotation
against a gold standard and achieve an f-score of 95%.
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