NooJ2008 Budapest Verb Valency Enhanced Croatian Lexicon Kristina Vučković, Nives Mikelić Preradović, Zdravko Dovedan Faculty of Humanities and Social Sciences University of Zagreb Department of Information Sciences Ivana Lucica 3, Zagreb, Croatia

NooJ2008 Budapest The Plan OOur agenda? IIncrease # of unambiguos NPs BBy means of? EExisting chunker VVerb valency tags WWhy? TTo raise the chunker performence to a higher level MMake preparations for a Croatian parser

NooJ2008 Budapest Overview CCroatian verb valency lexicon mmain characteristics sselected data ..xml to.dic conversion hhow we did it pprevious grammars for <<VP> |<NP> | <PP> selection nnew enhanced grammars <<VP+DCobl> <<VP+PCobl> <<VP+PCtyp> rresults comparison pprecision, rrecall, ff-measure

NooJ2008 Budapest Croatian verb valency lexicon - CROVALLEX  Formal description of verb valency frames  1739 verbs  selected from the Croatian frequency dictionary,  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!

NooJ2008 Budapest Selected data 1.Reflexive particle ‘ se ’  if the verb is derived reflexive (e.g. vratiti se)  reflexiva tantum (e.g. smijati se).

NooJ2008 Budapest Selected data 2.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.

NooJ2008 Budapest Selected data 3.Prepositional case.  Lemma of the preposition and  number of the required morphological case are specified, e.g.  od+2,  na+4,  o+6

NooJ2008 Budapest  pjevati,aspect=inf+DC_obl=0+AL_typ+PC_obl=6+… CROVALLEX *.xml

NooJ2008 Budapest Converting to *.dic

NooJ2008 Budapest Croatian lexicon  Nouns –  Adjectives –  Verbs  Adverbs  Proper Nouns –  S + C + Q + I + PRO - 363

NooJ2008 Budapest Previous grammars

NooJ2008 Budapest Perfect

NooJ2008 Budapest II. Future

NooJ2008 Budapest

NooJ2008 Budapest New Grammars

NooJ2008 Budapest Verb + Obligatory DC

NooJ2008 Budapest Verb + obligatory PC

NooJ2008 Budapest Verb + typical PC

NooJ2008 Budapest VP+DCobl=

NooJ2008 Budapest VP+DCobl=Genitiv

NooJ2008 Budapest VP+DCobl=Dativ

NooJ2008 Budapest agreement

NooJ2008 Budapest Results By handBefore CROVALLEX After CROVALLEX # of NP # of T unambiguous NP # of ambiguous NP # of F unambiguous NP 26+20

NooJ2008 Budapest P-R-F for unambiguous NPs Before CROVALLEX After CROVALLEX Precision 33,3168,13 Recall 52,2663,39 F-measure 40,6965,68

NooJ2008 Budapest 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').