1 / 18

WORDNET

WORDNET. THE WORDNET SYSTEM. Lexicographer files Code: Lexico files  database Search Routines and Interfaces. SYNSETS. A list of synonymous words or collocations that are interchangable in some context Pointers that describe the relations between

igor-guerra
Download Presentation

WORDNET

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WORDNET

  2. THE WORDNET SYSTEM • Lexicographer files • Code: Lexico files  database • Search Routines and Interfaces

  3. SYNSETS • A list of synonymous words or collocations that are interchangable in some context • Pointers that describe the relations between different synsets • Lexical and Semantic relations recognized

  4. SYNSETS contd…….. • NOUNS • VERBS • ADJECTIVES Clusters of head synsets and satellite synsets Clusters are antonymous pairs/triplets Pertainyms • ADVERBS derived from adjectives lexical pointer to root adjective Lexical Relations

  5. LEXICAL RELATIONS • Synonymy • Polysemy • Hyponymy/Hypernomy • Meronymy/Holonomy • Antonymy • Troponomy

  6. Definitions… • Synonymy: Different words - related senses of meanings • Polysemy: Same word - different senses of meanings • Troponomy: Verbs that denote manner elaboration of another verb

  7. …more Definitions • Hyponymy/Hyperonymy: Generic or Universal – Specific or Particular (IS-A) • Meronymy/Holonomy: Part of (HAS-A) • Antonymy: Opposite sense

  8. FILES • Database INDEX files (Unix) index.pos (Unix) pos .idx (Windows) • Database DATA files (Unix) data.pos (Unix) pos .dat (Windows) • Files of sentences illustrating the use of VERB *.vrb • Morphology Exception lists pos .exc

  9. FILE FORMATS • INDEX FILE FORMAT lemma pos synset_cnt p_cnt [ptr_symbol...] sense_cnt tagsense_cnt synset_offset [synset_offset...] • DATA FILE FORMAT synset_offset lex_filenum ss_type w_cnt word lex_id [word lex_id...] p_cnt [ptr...] [frames...] | gloss ptr: Pointer_symbol synset_offset pos source/target Frames: f_cnt + f_num w_num [ + f_num w_num + ..]

  10. Formats… • SENSE INDEX FORMAT sense_key synset_offset sense_number tag_cnt Sense-key:lemma%lex_sense Lex_sense: ss_type:lex_filenum:lex_id:head_word:head_id

  11. MORPHY • Query Base form • Query is single word or collocation • Single word: Separating inflections from query strings - plural of nouns - forms of verbs - degree of adjectives • Collocation: - individual base forms - hyphens, spaces, period as delimiters

  12. MORPHY AT WORK…. • NOUN grapes  grape • VERB eating  eat • ADJ faster  fast • ADV greenish  green Returns a base form OR NULL on every call eg: axes - 2 base forms (axe and axis)

  13. INPUT SEARCHES -Synonyms - Ordered by estimated frequency - Coordinate terms - Hypernyms - Derivationally related forms - Sentence frames - Synonyms grouped by similarity

  14. VARIOUS SEARCHES…. • Derivationally Related Forms: word forms that are morphologically related to searchstr • Co-ordinate Terms: words having the same hypernyms • Sentence Frames: illustrative sentences

  15. DISPLAY OF SENSES • Sense n [{synset_offset}] [<lex_filename>] word1[#sense_number][, word2...] • Each synset is printed on one line • Each line of output is preceded by a marker (usually => ) then a synset • synset glosses in parentheses at the end of each synset

  16. Contd……. • Indentation by spaces for different levels in hierarchy • Semantic tagging using Brown Corpus • Senses are ordered by decreasing frequency of use • Verb senses grouped by similarity of meaning

  17. Overview for "swimming" • The noun "swimming" has 1 sense in WordNet. 1. swimming, swim -- (the act of swimming) • The verb "swim" has 2 senses in WordNet. 1. swim -- (travel through water; "We had to swim for 20 minutes to reach the shore"; "a big fish was swimming in the tank") 2. float, swim -- (be afloat; stay on a liquid surface; not sink) • The adjective "swimming" has 2 senses in WordNet. 1. liquid, swimming, watery -- (filled or brimming with tears; "swimming eyes"; "watery eyes"; "sorrow made the eyes of many grow liquid") 2. naiant, swimming -- (applied to a fish depicted horizontally)

  18. Thank You

More Related