NLTK -- the Natural Language Toolkit -- is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. NLTK requires Python version 3.7, 3.8, 3.9 or 3.10.
For documentation, please visit nltk.org.
Bird, Steven, Edward Loper and Ewan Klein (2009).
Natural Language Processing with Python. O'Reilly Media Inc.
Copyright (C) 2001-2022 NLTK Project
For license information, see LICENSE.txt.
AUTHORS.md contains a list of everyone who has contributed to NLTK.
- NLTK source code is distributed under the Apache 2.0 License.
- NLTK documentation is distributed under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States license.
- NLTK corpora are provided under the terms given in the README file for each corpus; all are redistributable and available for non-commercial use.
- NLTK may be freely redistributed, subject to the provisions of these licenses.