Transcript Word Net

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
different synsets
 Lexical and Semantic relations recognized
SYNSETS contd……..
 NOUNS
 VERBS
 ADJECTIVES
Lexical Relations
Clusters of head synsets and satellite synsets
Clusters are antonymous pairs/triplets
Pertainyms
 ADVERBS
derived from adjectives
lexical pointer to root adjective
LEXICAL RELATIONS
 Synonymy
 Polysemy
 Hyponymy/Hypernomy
 Meronymy/Holonomy
 Antonymy
 Troponomy
Definitions…
 Synonymy:
Different words - related senses of meanings
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Polysemy:
Same word - different senses of meanings

Troponomy:
Verbs that denote manner elaboration of
another verb
…more Definitions
 Hyponymy/Hyperonymy:
Generic or Universal –
Specific or Particular (IS-A)
 Meronymy/Holonomy:
Part of (HAS-A)
 Antonymy:
Opposite sense
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
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 + ..]
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
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
MORPHY AT WORK….
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NOUN grapes
VERB eating
ADJ
faster
ADV greenish
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grape
eat
fast
green
Returns a base form OR NULL on every call
eg: axes - 2 base forms (axe and axis)
INPUT SEARCHES
-Synonyms
- Ordered by estimated frequency
- Coordinate terms
- Hypernyms
- Derivationally related forms
- Sentence frames
- Synonyms grouped by similarity
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
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
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
Overview for "swimming"
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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)
Thank You