NLTK Python Toolkit

Context:
- It can be used to create an NLTK-based NLP System.
- It can (typically) contain:
  - an NLTK Tokenizer, e.g. NLTK punkt tokenizer.
  - a Stemmer.
  - a PoS Tagger.
  - a Chunker.
  - a Parser.
  - a Classifier.
  - a Clusterer.
  - an NLTK Data Package.
- …
Example(s):
- NLTK v3.0: NLTK 3.0.2 (2014-03-13).
- NLTK v2.0: NLTK 2.0.3 (2012-09-24).
- …
Counter-Example(s):
- spaCy.
- Stanford Core NLP.
- NSP System.
- Apache OpenNLP.
- Allen NLP.
See: OpenNLP System.

References

(Wikipedia, 2015) ⇒ http://en.wikipedia.org/wiki/Natural_Language_Toolkit Retrieved:2015-7-12.
- The Natural Language Toolkit, or more commonly NLTK, is a suite of libraries and programs for symbolic and statistical natural language processing (NLP) for the Python programming language. NLTK includes graphical demonstrations and sample data. It is accompanied by a book that explains the underlying concepts behind the language processing tasks supported by the toolkit, plus a cookbook.
  NLTK is intended to support research and teaching in NLP or closely related areas, including empirical linguistics, cognitive science, artificial intelligence, information retrieval, and machine learning.
  NLTK has been used successfully as a teaching tool, as an individual study tool, and as a platform for prototyping and building research systems.

http://www.nltk.org/
- QUOTE: NLTK is a leading platform for building Python programs to work with human language data. It provides easy-to-use interfaces to over 50 corpora and lexical resources such as WordNet, along with a suite of text processing libraries for classification, tokenization, stemming, tagging, parsing, and semantic reasoning, and an active discussion forum.
  Thanks to a hands-on guide introducing programming fundamentals alongside topics in computational linguistics, NLTK is suitable for linguists, engineers, students, educators, researchers, and industry users alike. NLTK is available for Windows, Mac OS X, and Linux. Best of all, NLTK is a free, open source, community-driven project.
  NLTK has been called “a wonderful tool for teaching, and working in, computational linguistics using Python,” and “an amazing library to play with natural language.”
  Natural Language Processing with Python provides a practical introduction to programming for language processing. Written by the creators of NLTK , it guides the reader through the fundamentals of writing Python programs, working with corpora, categorizing text, analyzing linguistic structure, and more. The book is being updated for Python 3 and NLTK 3. (The original Python 2 version is still available at http://nltk.org/book_1ed.)