Translated title:
Exploring Higher Order Dependency Parsers
Authors:
Madhyastha, Pranava Swaroop ; Zeman, Daniel (advisor) ; Ramasamy, Loganathan (referee) Document type: Master’s theses
Year:
2012
Language:
eng Abstract:
[eng][cze] Most of the recent efficient algorithms for dependency parsing work by factoring the dependency trees. In most of these approaches, the parser loses much of the contextual information during the process of factorization. There have been approaches to build higher order dependency parsers - second order, [Carreras2007] and third order [Koo and Collins2010]. In the thesis, the approach by Koo and Collins should be further exploited in one or more ways. Possible directions of further exploitation include but are not limited to: investigating possibilities of extension of the approach to non-projective parsing; integrating labeled parsing; joining word-senses during the parsing phase [Eisner2000]Syntakticka analyza jejednim z nejdulezitejsich kroku pocitacoveho zpracovani pfirozenych jazyku. V teto praci se zamefujeme na formalismus zavislostni gramatiky, protoze jeho hlavnf principy, zejmena vztah fidiciho a zavisleho uzlu, se ukazaly uzitecne pro fadu rozdilnych jazyku, se zvlastnim zfetelem na vysvetleni slovosledu a vztahu mezi povrchovou strukturou a vyznamem. Vetsina modernich efektivnich algoritmu zavislostni syntakticke analyzy je zalozena na faktorizaci zavislostnich stromu. Ve vetsine techto pffstupu analyzator (parser) ztraci znacnou cast kontextove informace behem procesu faktorizace. V teto praci zkoumame, jak syntakticko-semanticke rysy ovlivnuji metody diskriminativniho strojoveho uceni vyssiho fadu pro zavislostni syntaktickou analyzu. Ukazujeme, ze lingvisticke rysy v mnoha pfipadech pfinaseji vyznamne zlepseni lispesnosti. Nejdrive pfinasime pfehled nekolika diskriminativnich metod uceni pro grafove statisticke zavislostni parsery a vysvetlujeme koncept vyssiho fadu, coz je zobecneni prace (Koo a Collins 2010) a (McDonald et al. 2006). Tonas dovede kjadru prace - rysovemu inzenyrstvi pro zavislostni parsery vyssiho fadu. Experimentujeme s nekolika syntakticko-semantickymi rysy a snazime se vysvetlit jejich teoreticke zaklady. Pokusy provadime na dvou odlisnych jazycich -...
Keywords:
dependency parsing; higher order; non-projectivity; dependency parsing; higher order; non-projectivity
Institution: Charles University Faculties (theses)
(web)
Document availability information: Available in the Charles University Digital Repository. Original record: http://hdl.handle.net/20.500.11956/48702