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Coreference from the Cross-lingual Perspective
Novák, Michal ; Žabokrtský, Zdeněk (advisor) ; Stede, Manfred (referee) ; Rosen, Alexandr (referee)
Coreference from the Cross-lingual Perspective Michal Nov'ak The subject of this thesis is to study properties of coreference using cross- lingual approaches. The work is motivated by the research on coreference-related linguistic typology. Another motivation is to explore whether differences in the ways how languages express coreference can be exploited to build better models for coreference resolution. We design two cross-lingual methods: the bilingually informed coreference resolution and the coreference projection. The results of our experiments with the methods carried out on Czech-English data suggest that with respect to coreference English is more informative for Czech than vice versa. Furthermore, the bilingually informed resolution applied on parallel texts has managed to outperform the monolingual resolver on both languages. In the experiments, we employ the monolingual coreference resolver and an improved method for alignment of coreferential expressions, both of which we also designed within the thesis. 1
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Coreference resolution for Universal Dependencies
Faryad, Ján ; Novák, Michal (advisor) ; Rosa, Rudolf (referee)
Title: Coreference resolution for Universal Dependencies Author: Ján Faryad Department: Institute of Formal and Applied Linguistics Supervisor: Mgr. Michal Novák Abstract: Coreference is an important tool for maintaining of the text coherence. Up to now, there has been no possibility to mark it in Universal Dependencies (UD), which is a project for universal description of morphology and dependency syntax. This work presents a way how to mark coreference in the UD project. It also includes a conversion of data with coreference annotation from the corpora PDT 3.0 and OntoNotes 5.0 with using a tool UDPipe for an automatic analysis of text in the UD style. This work is also aimed to implement a system for automatic resolution of pronoun coreference using machine learning. Finally, the quality of the system is evaluated by simple way. The design of the program emphasizes the language independence and compatibility with the Udapi interface, which is used for processing of the UD data. Keywords: coreference resolution, coreference, anaphora, Universal Dependencies, UD
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