By:Govind Raj
IT/1001227464
Topics of Discussion
 What is WORDNET?????

 International Scenarios.
 Design fundamentals.
 Major Lexical Relations.
...
What is WORDNET?????
 WordNet is a lexical database for the English

language based on conceptual look-up.
 George A. Mi...
Miller on Wordnet
 “In terms of coverage, WordNet’s goals

differ little from those of a good
standard college-level dict...
Wordnet: International Scenario
 Wordnet is a network of words linked by

lexical and semantic relations.
 The first wor...
Psycholinguistic Theory
 Can canary sing? – pretty fast response.
 Can canary fly ? – a bit slower response.
 Does cana...
Fundamental Design Questions
 Syntagmatic VS Paradigmatic ???

Syntagmatic – when words appear together in a unit.
Paradi...
Major Lexical Relations
Synonymy
Polysemy
Metonymy

Hyponymy/ Hypernymy
Meronymy/ Holonymy
Antonymy
Synonymy
 Different ways of expressing related concepts

 Examples
 cat, feline, Siamese cat

 Overlaps with basic and...
Polysemy
 Most words have more than one sense
 Homonym: same sound and/or spelling,

different meaning



bank (river)...
Metonomy
 Use one aspect of something to stand for the whole
 The building stands for the institution of the bank.
 Lib...
Hyponymy
 ISA relation
 Related to Super ordinate and Subordinate level

categories
 hyponym(robin , bird)
 hyponym(em...
Holonomy
 Part/Whole relation
 meronym(beak , bird)
 meronym(bark , tree)
 holonym(tree , bark)
 Transitive conceptua...
Antonymy
 Lexical opposites
 antonym(large, small)
 antonym(big, small)
 antonym(big, little)
 but not large, little
...
WordNet Sub-Graph (English)
Hyponymy
Dwelling,abode
Hypernymy

Meronymy

kitchen

Hyponymy
bckyard

veranda

M
e
r
o
n
y
m...
Structure of Wordnet
Uses:
 Word sense disambiguation.
 Information retrieval.
 Automatic text classification.
 Automatic text summarizatio...
WordNet : Size
WordNet Uses “Synsets” – sets of
synonymous terms
POS

Synsets

Noun

Unique
Strings
114648

Verb

11306

1...
Linked Wordnets in India
Bengali
Wordnet

Dravidian
Language
Wordnets

Sanskrit
Wordnet

Punjabi
Wordnet

Hindi
Wordnet
No...
Wordnet
Wordnet
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Wordnet

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Wordnet is an online Knowledgebase which is devloped by Princeton university and is really important to know.

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Wordnet

  1. 1. By:Govind Raj IT/1001227464
  2. 2. Topics of Discussion  What is WORDNET?????  International Scenarios.  Design fundamentals.  Major Lexical Relations.  Uses of Wordnet.  Wordnets in India.
  3. 3. 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.
  4. 4. 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. ”
  5. 5. Wordnet: International Scenario  Wordnet 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.
  6. 6. Psycholinguistic Theory  Can canary sing? – pretty fast response.  Can canary fly ? – a bit slower response.  Does canary have skin ? – a slow response. Animal Bird Canary
  7. 7. Fundamental Design Questions  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
  8. 8. Major Lexical Relations Synonymy Polysemy Metonymy Hyponymy/ Hypernymy Meronymy/ Holonymy Antonymy
  9. 9. Synonymy  Different ways of expressing related concepts  Examples  cat, feline, Siamese cat  Overlaps with basic and subordinate levels  Synonyms are almost never truly substitutable  Used in different contexts  Have different implications  This is a point of contention
  10. 10. Polysemy  Most words have more than one sense  Homonym: same sound and/or spelling, different meaning   bank (river) bank (financial)  Polysemy: different senses of same word  That 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
  11. 11. Metonomy  Use one aspect of something to stand for the whole  The building stands for the institution of the bank.  Library stands for a whole set of books ..  Mostly all collective nouns came under this.
  12. 12. Hyponymy  ISA relation  Related to Super ordinate and Subordinate level categories  hyponym(robin , bird)  hyponym(emu, bird)  hyponym(bird, animal)  hypernym(animal , bird)  A is a hypernym of B if B is a type of A  A is a hyponym of B if A is a type of B
  13. 13. Holonomy  Part/Whole relation  meronym(beak , bird)  meronym(bark , tree)  holonym(tree , bark)  Transitive conceptually but not lexically  The 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
  14. 14. Antonymy  Lexical 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.
  15. 15. WordNet Sub-Graph (English) Hyponymy Dwelling,abode Hypernymy Meronymy kitchen Hyponymy bckyard veranda M e r o n y m y bedroom house,home Gloss A place that serves as the living quarters of one or mor efamilies Hyponymy study guestroom hermitage cottage
  16. 16. Structure of Wordnet
  17. 17. Uses:  Word sense disambiguation.  Information retrieval.  Automatic text classification.  Automatic text summarization.  Machine translation  Automatic crossword puzzle generation.  Improve search engine results
  18. 18. WordNet : Size WordNet Uses “Synsets” – sets of synonymous terms POS Synsets Noun Unique Strings 114648 Verb 11306 13508 Adjective 21436 18563 Adverb 4669 3664 Totals 152059 115424 79689
  19. 19. Linked Wordnets in India Bengali Wordnet Dravidian Language Wordnets Sanskrit Wordnet Punjabi Wordnet Hindi Wordnet North East Language Wordnet Konkani Wordnet Marathi Wordnet English Wordnet
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