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- # Natural Language Toolkit: Stemmers
- #
- # Copyright (C) 2001-2020 NLTK Project
- # Author: Trevor Cohn <tacohn@cs.mu.oz.au>
- # Edward Loper <edloper@gmail.com>
- # Steven Bird <stevenbird1@gmail.com>
- # URL: <http://nltk.org/>
- # For license information, see LICENSE.TXT
- """
- NLTK Stemmers
- Interfaces used to remove morphological affixes from words, leaving
- only the word stem. Stemming algorithms aim to remove those affixes
- required for eg. grammatical role, tense, derivational morphology
- leaving only the stem of the word. This is a difficult problem due to
- irregular words (eg. common verbs in English), complicated
- morphological rules, and part-of-speech and sense ambiguities
- (eg. ``ceil-`` is not the stem of ``ceiling``).
- StemmerI defines a standard interface for stemmers.
- """
- from nltk.stem.api import StemmerI
- from nltk.stem.regexp import RegexpStemmer
- from nltk.stem.lancaster import LancasterStemmer
- from nltk.stem.isri import ISRIStemmer
- from nltk.stem.porter import PorterStemmer
- from nltk.stem.snowball import SnowballStemmer
- from nltk.stem.wordnet import WordNetLemmatizer
- from nltk.stem.rslp import RSLPStemmer
- from nltk.stem.cistem import Cistem
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