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Extraction of multilingual valency frames from dependency treebanks
Faryad, Ján ; Zeman, Daniel (advisor) ; Lopatková, Markéta (referee)
Multilingual valency dictionaries provide helpful information about correspon- dence of valency frames (verbs and their arguments) across various languages. This work aims at developing a program that automatically creates a multi- lingual valency dictionary, based on parallel treebanks annotated according to Universal Dependencies. This task includes monolingual extraction of va- lency frames and their cross-lingual linking. Various methods for solving the task are analysed and implemented. The work includes both general, language- independent approach and additional language-specific extensions, provided in particular for English, Czech and Slovak. The methods for linking the valency frames include using word alignment, morphological and syntactic information contained in the UD annotation or similarity of verbs between related languages. The quality of the solution is evaluated by multiple established metrics on man- ually annotated data or by comparison with an existing valency dictionary. 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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