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Improved Parser for Simple Croatian Sentences

Kristina Vučković, Božo Bekavac, Zdravko DovedanUniversity of Zagreb, Faculty of Humanities and Social Science

{kvuckovi, bbekavac,zdovedan}@ffzg.hr

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Problems

if there is a nominal predicate

if the <NP> node is a coordination made of 2 or more <NP>’s of different gender

ex. The child was very

smart.

-> The child was->was very smart.

ex. The boy and a girl

were very smart.

->The boy and a girl =><NP+p+m>

Last Year’sSolved

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Nominal Predicate simple <NP>

single noun He is a boy.

complex <NP> single noun + any number of adjectives,

pronouns, numerals proceeding and agreeing with the noun in number, gender and case He is my young friend.

single pronoun He is mine.

single adjective He is young.

single numeral He is the first.

adverb He is great.

redefined <NP><(PRO|A|M)*N><(PRO|A|M)*PRO><(PRO|A|M)*A><(PRO|A)*M>

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Examples

Pravda i opraštanje su dva temeljna stupa mira. Justice and

forgiveness are two main pillars of peace.

Cijene su izuetno povoljne. Prices are

extremely affordable.

To je izvrsno. This is great.

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Measures and Explanations

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<to be,VP> <NP+Nom>=Adjective same form as <VP+Passive>Knjiga je napisana… The book is written…Napisana knjiga je … The written book is…

Precision:

Recall:

72,72

69,56

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Coordination of multiple <NP> nodes1. all <NP> are in the same gender <NP+f<NP+fjabuka>, <NP+fkruška> i

<NP+fšljiva>> an apple, a pear and a plum

2. combination of masculine and feminine <NP> <NP+m<NP+fjabuka>, <NP+fkruška> i

<NP+mananas>> an apple, a pear and a pineapple

3. combination of masculine and neutral <NP> <NP+m<NP+mananas> i <NP+ndijete>>

a pineapple and a child4. combination of neutral and feminine <NP> <NP+m<NP+fjabuka> i <NP+ndijete>>

an apple and a child

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Coordination of two or more proper nouns <NP+mZagreb> i <NP+mDubrovnik> <NP+mZagreb> i <NP+fBarcelona>

<NP+mTin Ujdur> i <NP+mFilip Kocijan>

<NP+fEma Ujdur> i <NP+mFilip Kocijan>

<NP+mUjdur> i <NP+mKocijan> <NP+fUjdur> i <NP+fKocijan> <NP+fUjdur> i <NP+mKocijan>

<NP+m ><NP+m >

<NP+m ><NP+m >

Last Names only

<NP+m > su otišli

<NP+f > su otišle

<NP+m > su otišli

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Example of concordance

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Measures

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Precision:

Recall:

100

90

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for your attention.

Thank you

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