Publikation
Converting CCGs into Typed Feature Structure Grammars
Hans-Ulrich Krieger; Bernd Kiefer
In: Proceedings of the 18th International Conference on Head-Driven Phrase Structure Grammar. International Conference on Head-Driven Phrase Structure Grammar (HPSG-2011), August 22-25, Seattle, WA, USA, CSLI Publications, 2011.
Zusammenfassung
In this paper, we report on a transformation scheme that turns a Categorial
Grammar, more specifically, a Combinatory Categorial Grammar into a
derivation- and meaning-preserving typed feature structure (TFS) grammar.
We describe the main idea which can be traced back at least to work by
Karttunen, Uszkoreit, Bouma, and Calder et al.
We then show how a typed representation of complex categories can be extended
by other constraints, such as modes, and indicate how the Lambda semantics of
combinators is mapped into a TFS representation, using unification to
perform alpha-conversion and beta-reduction.
We also present first findings concerning runtime measurements, showing
that the PET system, originally developed for the HPSG grammar framework,
outperforms the OpenCCG parser by a factor of more than 10.