Natural Language Toolkit (NLTK)

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• Natural Language Tools & Services
• Natural Language Toolkit | NLTK.org
• NLP Tutorial Using Python NLTK (Simple Examples)
• How to do Natural Language Processing | Anaconda Documentation
• How Machines Understand Our Language: An Introduction to Natural Language Processing | Emma Grimaldi - KDnuggets

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, wrappers for industrial-strength NLP libraries, and an active discussion forum.