ó <¿CVc@sŠdZddlmZddlmZddlmZddlmZddl m Z ddl m Z ddl mZdd lmZd S( s 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. iÿÿÿÿ(tStemmerI(t RegexpStemmer(tLancasterStemmer(t ISRIStemmer(t PorterStemmer(tSnowballStemmer(tWordNetLemmatizer(t RSLPStemmerN(t__doc__t nltk.stem.apiRtnltk.stem.regexpRtnltk.stem.lancasterRtnltk.stem.isriRtnltk.stem.porterRtnltk.stem.snowballRtnltk.stem.wordnetRtnltk.stem.rslpR(((sd/private/var/folders/cc/xm4nqn811x9b50x1q_zpkmvdjlphkp/T/pip-build-FUwmDn/nltk/nltk/stem/__init__.pyts