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Published byErick Stevenson Modified over 9 years ago
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WORDNET
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THE WORDNET SYSTEM Lexicographer files Code: Lexico files database Search Routines and Interfaces
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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
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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
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LEXICAL RELATIONS Synonymy Polysemy Hyponymy/Hypernomy Meronymy/Holonomy Antonymy Troponomy
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Definitions… Synonymy: Different words - related senses of meanings Polysemy: Same word - different senses of meanings Troponomy: Verbs that denote manner elaboration of another verb
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…more Definitions Hyponymy/Hyperonymy: Generic or Universal – Specific or Particular (IS-A) Meronymy/Holonomy: Part of (HAS-A) Antonymy: Opposite sense
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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
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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 +..]
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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
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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
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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)
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INPUT SEARCHES -Synonyms - Ordered by estimated frequency - Coordinate terms - Hypernyms - Derivationally related forms - Sentence frames - Synonyms grouped by similarity
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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
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DISPLAY OF SENSES Sense n [{synset_offset}] [ ] 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
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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
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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)
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