nltk.stem package

Submodules

• nltk.stem.api module
• nltk.stem.isri module
• nltk.stem.lancaster module
• nltk.stem.porter module
• nltk.stem.regexp module
• nltk.stem.rslp module
• nltk.stem.snowball module
• nltk.stem.util module
• nltk.stem.wordnet module

Module contents

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.