Can WordNetLemmatizer in Nltk stem words?

Question

I want to find word stems with Wordnet. Does wordnet have a function for stemming? I use this import for my stemming, but it doesn't work as expected.

from nltk.stem.wordnet import WordNetLemmatizer
WordNetLemmatizer().lemmatize('Having','v')

@jacob - well done chap, I was just about to edit this into shape as well :) — Kev, Jul 12 '11 at 15:53
If your input is in English, why would you want to stem when lemmas contain much more useful information about the token? — alvas, Jun 26 '13 at 10:08

score 10 · Answer 1 · answered Jul 12 '11 at 10:02

10

Seems like you have to input a lowercase string to the lemmatize method:

>>> WordNetLemmatizer().lemmatize('having','v')
'have'
>>> WordNetLemmatizer().lemmatize('has','v')
'have'

answered Jul 12 '11 at 10:02

Fred Foo

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score 2 · Accepted Answer · answered Jul 12 '11 at 01:40

2

Try using one of the stemmers in nltk.stem module, such as the PorterStemmer. Here's an online demo of NLTK's stemmers: http://text-processing.com/demo/stem/

answered Jul 12 '11 at 01:40

Josh Rosen

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Thanks But PorterStemmer Is Very Old Method ... Lancaster Is newser Than Porter But I want to stem with wordnet. Thanks For Your Answer – Masoud Abasian Jul 12 '11 at 04:40
I see this Before . it's good site for stemming. Lancaster is most stronger than porterstemmer. thank you – Masoud Abasian Jul 12 '11 at 15:56

score 0 · Answer 3 · answered Apr 15 '14 at 14:30

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No, Wordnet cannot stem the words. It can only give lemmatized words i.e. words which are actual words in the language. A stemmer may not always give real meaningful words.

answered Apr 15 '14 at 14:30

user1961213

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Can WordNetLemmatizer in Nltk stem words?

3 Answers3

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