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venv/lib/python3.7/site-packages/nltk/stem/__init__.py

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+# Natural Language Toolkit: Stemmers
+#
+# Copyright (C) 2001-2019 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