wordnet
DESCRIPTION
Wordnet is an online Knowledgebase which is devloped by Princeton university and is really important to know.TRANSCRIPT
By:-Govind Raj
IT/1001227464
WORDNETA Lexical Knowledgebase
Topics of DiscussionWhat is WORDNET?????International Scenarios.Design fundamentals.Major Lexical Relations.Uses of Wordnet.Wordnets in India.
What is WORDNET?????WordNet is a lexical database for
the English language based on conceptual look-up.
George A. Miller who began the WordNet project in the mid 1980s.
Organizes lexical information in terms of word meanings rather than word form.
Wordnet can also be used as a thesaurus.
Miller on Wordnet“In terms of coverage, WordNet’s goals differ little from those of a good standard college-level dictionary, and the semantics of WordNet is based on the notion of word sense that lexicographers have traditionally used in writing dictionaries. ”
Wordnet: International ScenarioWordnet is a network of words linked by
lexical and semantic relations.The first wordnet in the world was for
English developed at Princeton over 15 years.
The Eurowordnet- linked structure of European language wordnet was built in 1998 over 3 years.
Wordnets for Hindi and Marathi being built at IIT Bombay are amongst the first IL wordnet.
All these are proposed to be linked into the IndoWordnet which eventually will be linked to the English and the Euro wordnet.
Can canary sing? – pretty fast response.Can canary fly ? – a bit slower response.Does canary have skin ? – a slow response.
Psycholinguistic Theory
Animal
Bird
Canary
Syntagmatic VS Paradigmatic ???Syntagmatic – when words appear together in a
unit.Paradigmatic – if words are linked in a lexical
resource
When we hear a word , many words come to our mind through association.
For cat :animal , mammal – Paradigmatic
mew , purr , furry - Syntagmatic
Fundamental Design Questions
Major Lexical RelationsSynonymyPolysemyMetonymyHyponymy/ HypernymyMeronymy/ HolonymyAntonymy
SynonymyDifferent ways of expressing related
conceptsExamples
cat, feline, Siamese catOverlaps with basic and subordinate
levelsSynonyms are almost never truly
substitutableUsed in different contextsHave different implications
This is a point of contention
PolysemyMost words have more than one senseHomonym: same sound and/or spelling,
different meaningbank (river)bank (financial)
Polysemy: different senses of same wordThat dog has floppy ears.She has a good ear for jazz.bank (financial) has several related senses
the building, the institution, the notion of where money is stored
MetonomyUse one aspect of something to stand for the
wholeThe building stands for the institution of the
bank.Library stands for a whole set of books ..Mostly all collective nouns came under this.
HyponymyISA relationRelated to Super ordinate and Subordinate
level categorieshyponym(robin , bird)hyponym(emu, bird)hyponym(bird, animal)hypernym(animal , bird)
A is a hypernym of B if B is a type of AA is a hyponym of B if A is a type of B
HolonomyPart/Whole relation
meronym(beak , bird)meronym(bark , tree)holonym(tree , bark)
Transitive conceptually but not lexicallyThe knob is a part of the door.The door is a part of the house.The knob is a part of the house
Holonyms are (approximately) the inverse of meronyms
AntonymyLexical opposites
antonym(large, small)antonym(big, small)antonym(big, little)but not large, little
Many antonymous relations can be reliably detected by looking for statistical correlations in large text collections.
Gloss
study
Hyponymy
Hyponymy
Dwelling,abode
bedroom
kitchen
house,home
A place that serves as the living quarters of one or mor efamilies
guestroom
veranda
bckyard
hermitage cottage
Meronymy
Hyponymy
Meronymy
Hypernymy
WordNet Sub-Graph (English)
Structure of Wordnet
Uses: Word sense disambiguation. Information retrieval. Automatic text classification. Automatic text summarization. Machine translation Automatic crossword puzzle generation. Improve search engine results
WordNet : Size
POS Unique Synsets Strings
Noun 114648 79689
Verb 11306 13508
Adjective 21436 18563
Adverb 4669 3664
Totals 152059 115424
WordNet Uses “Synsets” – sets of synonymous terms
Hindi Wordnet
Dravidian Language Wordnets
North East Language Wordnet
Marathi Wordnet
Sanskrit Wordnet
EnglishWordnet
Bengali Wordnet
Punjabi Wordnet
KonkaniWordnet
Linked Wordnets in India