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Croatian Verb Valency Lexicon: Enhancing Noun Phrase Recognition

Explore the Croatian verb valency lexicon for improved performance in chunker and parser development. Detailed frames and data for precise noun phrase analysis.

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Croatian Verb Valency Lexicon: Enhancing Noun Phrase Recognition

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  1. Verb Valency Enhanced Croatian Lexicon Kristina Vučković, Nives Mikelić Preradović, Zdravko Dovedan kvuckovi@ffzg.hr, nmikelic@ffzg.hr, zdovedan@ffzg.hr Faculty of Humanities and Social Sciences University of Zagreb Department of Information Sciences Ivana Lucica 3, Zagreb, Croatia NooJ2008Budapest 2008-06-08

  2. The Plan • Our agenda? • Increase # of unambiguos NPs • By means of? • Existing chunker • Verb valency tags • Why? • To raise the chunker performence to a higher level • Make preparations for a Croatian parser NooJ2008Budapest 2008-06-08

  3. Overview • Croatian verb valency lexicon • main characteristics • selected data • .xml to .dic conversion • how we did it • previous grammars for • <VP> | <NP> | <PP> selection • new enhanced grammars • <VP+DCobl> • <VP+PCobl> • <VP+PCtyp> • results comparison • precision, • recall, • f-measure NooJ2008Budapest 2008-06-08

  4. Croatian verb valency lexicon - CROVALLEX • Formal description of verb valency frames • 1739 verbs • selected from the Croatian frequency dictionary, 1999. • 5118 valency frames (in average: 3 frames per verb) • Each frame entry contains descriptions of • valence frame • frame attributes • frame attributes are either obligatory or optional i.e. obligatory or typical! NooJ2008Budapest 2008-06-08

  5. Selected data • Reflexive particle ‘se’ • if the verb is derived reflexive (e.g. vratiti se) • reflexiva tantum (e.g. smijati se). NooJ2008Budapest 2008-06-08

  6. Selected data • Pure (prepositionless) case. • 7 morphological cases in Croatian. • 0-hidden nominative, • 1 - nominative, • 2 - genitive, • 3 - dative, • 4 - accusative, • 5 - vocative, • 6 - locative, • 7 - instrumental. NooJ2008Budapest 2008-06-08

  7. Selected data • Prepositional case. • Lemma of the preposition and • number of the required morphological case are specified,e.g. • od+2, • na+4, • o+6 NooJ2008Budapest 2008-06-08

  8. CROVALLEX 2.0008 - *.xml • pjevati,aspect=inf+DC_obl=0+AL_typ+PC_obl=6+… NooJ2008Budapest 2008-06-08

  9. Converting to *.dic NooJ2008Budapest 2008-06-08

  10. Previous grammars NooJ2008Budapest 2008-06-08

  11. Perfect NooJ2008Budapest 2008-06-08

  12. II. Future NooJ2008Budapest 2008-06-08

  13. NooJ2008Budapest 2008-06-08

  14. New Grammars NooJ2008Budapest 2008-06-08

  15. Verb + Obligatory DC NooJ2008Budapest 2008-06-08

  16. Verb + obligatory PC NooJ2008Budapest 2008-06-08

  17. Verb + typical PC NooJ2008Budapest 2008-06-08

  18. VP+DCobl= NooJ2008Budapest 2008-06-08

  19. VP+DCobl=Genitiv NooJ2008Budapest 2008-06-08

  20. VP+DCobl=Dativ NooJ2008Budapest 2008-06-08

  21. <VP>+<NP+N> agreement NooJ2008Budapest 2008-06-08

  22. Results NooJ2008Budapest 2008-06-08

  23. P-R-F for unambiguous NPs NooJ2008Budapest 2008-06-08

  24. Future work • Subordinating conjunction. • Infinitive construction can appear • with a preposition (e.g. 'nego+inf') • with the morphological case (e.g. 'inf+4'). • Construction with adjectives. • e.g. adj-7 ('Osjećam se osvježenim' - 'I feel fresh'). • Construction with adverbs. • e.g. adv-hrabro ('Osjećam se hrabro' - 'I feel brave'). • Construction with nominative predicate. • e.g. nom_pred ('Historija je postala legendom' - 'History has become a legend'). NooJ2008Budapest 2008-06-08

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