Indo WordNet a wordNet for Hindi Introduction

Indo WordNet A WordNet for Hindi

Introduction

• WordNet – A lexical database

• Searching the dictionary conceptually

• Different organizing principle for different syntactic category

• Synsets or the Synonymy Sets are the basic building blocks

• Lexical knowledge base is the heart of any intelligent information processing system

WordNet for Hindi

• Hindi WordNet is an on-line lexical database for Hindi language

• Design has been inspired by the famous English WordNet

• Unique features

• Graded antonyms and meronymy relationships
• Efficient underlying database design
• Cross part of speech linkage

Semantic relations in WordNet

• Synonymy

• Hypernymy / Hyponymy

• Antonymy

• Meronymy / Holonymy

• Gradation

• Entailment

• Troponymy

Semantic Relations

• Synonymy

• True synonyms are rare
• Synonymy related to a context
• {Gar ‚ kmara}
• {Gar ‚ Aavaasa}
• {Gar ‚ janmakuMDlaIya sqaana}
• {Gar ‚ svadoSa}

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

• lionanimalliving entityentity

• Saor  pSau  sajaIva  Aist%va

Semantic Relations

• 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

Troponym and Entailment

• Entailment

• { Kra-Ta laonaa – saaonaa £

• Troponym

• { laÐgaD,anaa ‚ kdmatala krnaa – calanaa £
• ¡ fusafusaanaa – baaolanaa £

Antonymy Relation

Meronymy Relation

Gradation

Classification of verbs

• Simple verbs (sarla iËyaa) : saaonaa‚ Kanaa

• Conjunct verbs (saMyau@t iËyaa)

• Compound verbs (samaaisak iËyaa) Á Kanaa–pInaa

• Causative verbs (p`orNaa%mak iËyaa) Á saulavaanaa

Design and Implementation

• Basic relations or lexical links are between synonym sets

• Lexical database is stored in MySQL package

• Sub-tasks identified

• Database design
• Data entry interface
• Implementation of Organizer Utility
• Application programs to access and display the information in the lexical database

Data Entry Interface

• GUI designed in Java/JFC

• Separate screen for data entry of different categories

• Automatic generation of synset id’s

• Screen to view the entered data

Organizer Utility

• Designed to preprocess the data

• Reflexive pointers are generated

• e.g. if A hypernym of B then B hyponym of A is automatically generated

• Each semantic relation is mapped to a separate table (normalized)

• Font conversion

• Roman Hindi  DV-TTYogesh

Storage Structure

• Relation between Synsets

• tblNounHypernyms

• Relation between Word-forms

• tblNounAntonyms

System Statistics

• Over 8500 synsets entered in the database

• MySQL used as the back-end database server

• Data entry interface designed in Java/JFC

• Organizer utility written in perl

• Web based data retrieval system developed in HTML and PHP

• DV-TTYogesh Font used to display Hindi Text

Application of WordNet

• Word Sense Disambiguation

• Interface to Internet Search Engines

• Text classification

• Information Retrieval system

• Document Similarity

Conclusion

• The structure of Hindi Language have been studied and new features have been introduced in the Hindi WordNet

• Currently over 8500 synsets have been inserted into the database

• The MySQL database has been found to be quite efficient

• The web interface for querying the lexical database is under continuous evolution