Corpora: Natural Language Toolkit, Version 0.7

From: Edward Loper (
Date: Sun Jun 09 2002 - 03:24:48 MET DST

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    Version 0.7 of the Natural Language Toolkit is now available for
    download. The Natural Language Toolkit is a Python package that
    simplifies the construction of programs that process natural language.
    In particular:

      - It provides basic tools for manipulating data and performing tasks
        related to NLP.
      - It defines standard interfaces between the different components of
        an NLP system.
      - It provides an infrastructure for building new NLP systems.

    The toolkit's primary aim is to serve as a pedagogical tool; but it is
    also useful as a framework for implementing research-related programs.
    NLTK runs on most platforms, including Windows, OS X, Linux, and UNIX.
    For more information, or to download a copy, please visit our web page:
    Toolkit Contents

      - [Python Modules] implement the basic data types, tools, and
        interfaces that make up the toolkit.

      - [Tutorials] teach students how to use the toolkit, in the context
        of performing specific tasks.

      - [Exercises and Problem Sets] help students learn more about
        various aspects of natural language processing.

      - [Reference Documentation] provides precise definitions of the
        behavior of each module, interface, class, method, function, and
        variable defined by the toolkit.

      - [Technical Documentation] explains and justifies the toolkit's
        design and implementation.

    NLTK is an open source project, and we welcome any contributions. We
    deliberately structured NLTK to facilitate parallel development. If
    you are interested in contributing to NLTK, or have any ideas for
    improvements, please talk to us, or send us email at and
    NLTK 0.7 includes the following modules:

          [token] Basic classes for encoding and processing individual
              elements of text, such as words or sentences.
          [tree] Classes for representing hierarchical structures over
              text, such as syntax trees.
          [probability] Classes that encode frequency distributions and
              probability distributions.

          [tagger] A standard interface to tag each token of a text with
              supplementary information, such as its part of speech; and
              several implementations of that interface.

          [cfg] Basic data types for encoding context free grammars.
          [parser] A standard interface to produce trees representing the
              structure of texts; and two simple implementations of that
          [parser.chart] A flexible parser implementation that uses a
              chart to record hypotheses about syntactic constituents.
          [parser.chunk] A standard interface for robust parsers used to
              identify non-overlapping linguistic groups (such as base
              noun phrases) in unrestricted text; and a regular-expression
              based implementation of that interface.
          [parser.probabilistic] A standard interface for probabilistic
              parsers; and two implementations of that interface.

      Text Classification
          [classifier] A standard interface for classifying texts into
          [classifier.feature] A standard way of encoding the information
              used to make classification decisions.
          [classifier.naivebayes] A text classifier implementation based
              on the Naive Bayes assumption.
          [classifier.maxent] An implementation of the maximum entropy
              model for text classification; and implementations of the
              GIS and IIS algorithms for training the classifier.
          [classifier.featureselection] A standard interface for choosing
              which features are relevant for a given classification
      Finite State Automata
          [fsa] Classes for representing finite state automata and regular

      Visualization and Interactive Tools
          [draw] A Tk-based framework for building graphical tools.
          [draw.tree] A graphical representation for hierarchical
          [draw.fsa] A graphical representation for finite state automata.
          [draw.plot] A tool for graphing arbitrary functions.
          [draw.chart] An interactive graphical tool for experimenting
              with the chart parser.
          [draw.rdparser] An interactive graphical tool for exploring the
              recursive descent parser.
          [draw.srparser] An interactive graphical tool for learning about
              the shift/reduce parser.

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