Upload
roy-summers
View
221
Download
3
Embed Size (px)
Citation preview
1
Indo WordNet A WordNet for Hindi
Centre for Technology Development for Indian Languages
Computer Science and Engineering Department, IIT Bombay
2
Introduction
WordNet – A lexical databaseSearching the dictionary conceptuallyDifferent organizing principles for different syntactic categoriesSynsets or the Synonymy Sets are the basic building blocksLexical knowledge base is the heart of any intelligent information processing system
3
Semantic relations in WordNet
Synonymy
Hypernymy / Hyponymy
Antonymy
Meronymy / Holonymy
Gradation
Entailment
Troponymy
4
Synonymy
Synonymy True synonyms are rare Synonymy related to a context
{Gar ‚ kmara}{Gar ‚ Aavaasa}{Gar ‚ janmakuMDlaIya sqaana}
{Gar ‚ svadoSa}
5
How to create a synset
Word is chosen from a dictionary
The particular concept is made explicit
Other synonyms according to that concept are taken
Definition,example & ontology are given
Parts of speech are given
6
Principles adopted in creating synsets
Minimaility the minimal set of words to make the concept unique
Coveragethe maximal set of words- ordered by frequency in the
corpus- to include all possible words standing for the sense
Replaceability the example sentence should be such that the most frequent
words in the synset can replace one another in the sentence
without altering the sense
7
Example of a Synset in Wordnet
Example of a nominal concept
SaorSaor, baaGa, vyaaGa`, naahr : iballaI kI jaait ka ek bahut
baD,a AaOr BayaMkr, p``isaw ihMsak pSau “ iSakarI ko AcaUk inaSaanao nao Saor kao Gaayala kr idyaa ”
Saor, Saorao-SaayarI : ga,ja,la ko dao carNa “ ]sanao Saor saunaakr sabakI vaahvaahI laUTI ”
Saor, vaIrpuÉYa,, bahadur, narvaIr, narvyaaGa``, SaUr, SaUrvaIr, saUrmaa, vaIr: vah vaIrpuÉYa, jaao balavaana hao yaa saahsapUNa- yaa vaIrtapUNa- kaya- krta hao “ iSavaajaI kao maharaYT/ ka Saor kha jaata hO ”
8
Semantic Relations
Hypernymy and Hyponymy Relation between word meaning (synsets) X is a hyponym of Y if X is a kind of Y Hyponymy is transitive and asymmetrical Hypernymy is inverse of Hyponymy
lionanimalliving entityentity
Saor pSau sajaIva Aist%va
9
Semantic Relations (Contd…)
Antonymy Oppositeness in meaning Relation between word forms
Meronymy and Holonymy Part-whole relation, branch is a part of tree X is a meronymy of Y if X is a part of Y Meronym is transitive and asymmetrical Holonymy is inverse relation of Meronymy
10
Troponym and Entailment
Entailment { Kra-Ta laonaa – saaonaa £
Troponym { laÐgaD,anaa ‚ kdmatala krnaa –
calanaa £ ¡ fusafusaanaa – baaolanaa £
11
Cross Parts of Speech Linkage
linkages between Nominal and Verbal conceptsAbility Link
specifies the inherited features of a nominal concept
Capability Link
specifies the acquired features of a nominal concept
Function Link
specifies the function of a nominal concept
12
Cross Parts of Speech Linkage (Contd…)
jaMtuAbility Link
calanaa tOrnaa
maClaI Capability Link
vyai@t tOrnaabaaolanaa
taota
Function Link
calanaa
vaahna
isalanaa
isalaaš maSaIna
13
Cross Parts of Speech Linkage (Contd…)
linkage between nominal and adjective
conceptAttribute Link
denotes the properties of a noun
baaGa maaMsaaharI
inayattapIstnapayaI jaMtuNoun
Noun
Adjective
Adjective
Attribute
Attribute
14
Cross Parts of Speech Linkage (Contd…)
Derived from specifies the root form from which a particular word is
derived this relation can go from noun to adjective or vice versa,
noun to verb and adjective to verb aims to handle derivational morphology
Aaturta AaturAiBamaMi~t AiBamaM~Nabaityaanaa baat
gamaa-naa gama-
Derived from
Derived from
Derived from
Derived from
Noun
Noun
Noun
Verb
Verb
Adjective
Adjective
Adjective
15
Gloss
AQyayana kxa
Hyponymy
Hyponymy
Aavaasa , inavaasa
Sayana kxa
rsaao[-Gar
Gar , gaRh manauYyaaoM ka
Cayaa huAa vah sqaana jaao dIvaaraoM sao Gaor kr banaayaa jaata hO
Aitiqa gaRh
baramada
Aa^Mgana
AaEama
JaaopD,I
saMrcanaa
Meronymy
Hyponymy
Meronymy
Hypernymy
WordNet Sub-Graph