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- .. Copyright (C) 2001-2019 NLTK Project
- .. For license information, see LICENSE.TXT
- .. -*- coding: utf-8 -*-
- =========================
- Word Sense Disambiguation
- =========================
- Lesk Algorithm
- --------------
- Performs the classic Lesk algorithm for Word Sense Disambiguation (WSD) using
- a the definitions of the ambiguous word.
- Given an ambiguous word and the context in which the word occurs, Lesk returns
- a Synset with the highest number of overlapping words between the context
- sentence and different definitions from each Synset.
- >>> from nltk.wsd import lesk
- >>> sent = ['I', 'went', 'to', 'the', 'bank', 'to', 'deposit', 'money', '.']
- >>> print(lesk(sent, 'bank', 'n'))
- Synset('savings_bank.n.02')
- >>> print(lesk(sent, 'bank'))
- Synset('savings_bank.n.02')
- The definitions for "bank" are:
- >>> from nltk.corpus import wordnet as wn
- >>> for ss in wn.synsets('bank'):
- ... print(ss, ss.definition())
- ...
- Synset('bank.n.01') sloping land (especially the slope beside a body of water)
- Synset('depository_financial_institution.n.01') a financial institution that accepts deposits and channels the money into lending activities
- Synset('bank.n.03') a long ridge or pile
- Synset('bank.n.04') an arrangement of similar objects in a row or in tiers
- Synset('bank.n.05') a supply or stock held in reserve for future use (especially in emergencies)
- Synset('bank.n.06') the funds held by a gambling house or the dealer in some gambling games
- Synset('bank.n.07') a slope in the turn of a road or track; the outside is higher than the inside in order to reduce the effects of centrifugal force
- Synset('savings_bank.n.02') a container (usually with a slot in the top) for keeping money at home
- Synset('bank.n.09') a building in which the business of banking transacted
- Synset('bank.n.10') a flight maneuver; aircraft tips laterally about its longitudinal axis (especially in turning)
- Synset('bank.v.01') tip laterally
- Synset('bank.v.02') enclose with a bank
- Synset('bank.v.03') do business with a bank or keep an account at a bank
- Synset('bank.v.04') act as the banker in a game or in gambling
- Synset('bank.v.05') be in the banking business
- Synset('deposit.v.02') put into a bank account
- Synset('bank.v.07') cover with ashes so to control the rate of burning
- Synset('trust.v.01') have confidence or faith in
- Test disambiguation of POS tagged `able`.
- >>> [(s, s.pos()) for s in wn.synsets('able')]
- [(Synset('able.a.01'), 'a'), (Synset('able.s.02'), 's'), (Synset('able.s.03'), 's'), (Synset('able.s.04'), 's')]
- >>> sent = 'people should be able to marry a person of their choice'.split()
- >>> lesk(sent, 'able')
- Synset('able.s.04')
- >>> lesk(sent, 'able', pos='a')
- Synset('able.a.01')
- Test behavior if there is are no matching senses.
- >>> lesk('John loves Mary'.split(), 'loves', synsets=[])
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