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Locality of formal grammars

Xem 1-4 trên 4 kết quả Locality of formal grammars
  • We apply a complexity theoretic notion of feasible learnability called "polynomial learnabillty" to the evaluation of grammatical formalisms for linguistic description. We show that a novel, nontriviai constraint on the degree of ~locMity" of grammars allows not only context free languages but also a rich d ~ s of mildy context sensitive languages to be polynomiaily learnable. We discuss possible implications, of this result t O the theory of naturai language acquisition.

    pdf8p bungio_1 03-05-2013 27 1   Download

  • Taking examples from English and French idioms, this paper shows that not only constituent structures rules but also most syntactic rules (such as topicalization, wh-question, pronominalization ...) are subject to lexical constraints (on top of syntactic, and possibly semantic, ones). We show that such puzzling phenomena are naturally handled in a 'lexJcalized' formalism such as Tree Adjoining Grammar. The extended domain of locality of TAGs also allows one to 'lexicalize' syntactic rules while defining them at the level of constituent structures. ...

    pdf7p bungio_1 03-05-2013 24 2   Download

  • This tutorial overviews basic ideas of TAG/ CCG/LFG/HPSG, and provides attendees with a comparison of these formalisms from a linguistic and computational point of view. We start from stating the motivation behind using these expressive grammar formalisms for NLP, contrasting them with shallow formalisms like contextfree grammars.

    pdf1p hongdo_1 12-04-2013 41 5   Download

  • Scrambling, both local and long-distance, has recently attracted considerable attention among linguists and computational linguists. In this paper, we will explore the adequacy of the Tree Adjoining Grammar (TAG) formalism for dealing with long-distance scrambling I in German. We will show that TAGs cannot capture the full range of constructions derived by scrambling. I[owever, Multi-Component TAGs (MC-TAG), an extension of TAGs introduced earlier [Joshi 1987a, Weir 1988] and utilized for linguistic purposes (e.g.

    pdf6p buncha_1 08-05-2013 26 2   Download

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