NLTK — the Natural Language Toolkit — is a suite of open source Python modules, linguistic data and documentation for research and development in natural language processing, supporting dozens of NLP tasks, with distributions for Windows, Mac OSX and Linux.
Ruby-WordNet is a Ruby interface to the WordNet® Lexical Database. WordNet? is an online lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one
... [More] underlying lexical concept. Different relations link the synonym sets. [Less]
RelEx is an English-language semantic relationship extractor, built on the Carnegie-Mellon Link Grammar parser. It can identify dependency-grammar dependencies, such as subject, object, indirect object and many other relationships between words in a sentence. It can also provide part-of-speech
... [More] tagging, noun-number tagging, verb tense tagging, gender tagging, and so on. Relex includes a basic implementation of the Hobbs anaphora (pronoun) resolution algorithm. RelEx also provides semantic relationship framing, similar to that of FrameNet. [Less]
The LexAt "lexical attraction" aka the RelEx Statistical Linguistics package adds statistical algorithms to the RelEx. Corpus statistics, including mutual information, are maintained in an SQL database, and drawn on to enhance various RelEx functions, such as parse ranking and chunk ranking, and word-sense disambiguation (Mihalcea algo).
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