Mallet for Windows 2.0.7

License:Freeware

Size:13.0 MB

Date Added:28 April, 2013


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MALLET is a Java-based package for statistical natural language processing, document classification, clustering, topic modeling, information extraction, and other machine learning applications to text.

MALLET includes sophisticated tools for document classification: efficient routines for converting text to "features", a wide variety of algorithms (including Na+»ve Bayes, Maximum Entropy, and Decision Trees), and code for evaluating classifier performance using several commonly used metrics.

In addition to classification, MALLET includes tools for sequence tagging for applications such as named-entity extraction from text. Algorithms include Hidden Markov Models, Maximum Entropy Markov Models, and Conditional Random Fields. These methods are implemented in an extensible system for finite state transducers.

Topic models are useful for analyzing large collections of unlabeled text. The MALLET topic modeling toolkit contains efficient, sampling-based implementations of Latent Dirichlet Allocation, Pachinko Allocation, and Hierarchical LDA.

Many of the algorithms in MALLET depend on numerical optimization. MALLET includes an efficient implementation of Limited Memory BFGS, among many other optimization methods.

In addition to sophisticated Machine Learning applications, MALLET includes routines for transforming text documents into numerical representations that can then be processed efficiently. This process is implemented through a flexible system of "pipes", which handle distinct tasks such as tokenizing strings, removing stopwords, and converting sequences into count vectors.

An add-on package to MALLET, called GRMM, contains support for inference in general graphical models, and training of CRFs with arbitrary graphical structure.
Release notes: New Release
* Fixed a bug in the Generalized Expectation (GE) implementation for
MaxEnt models. The old code could give low accuracy when using a small
number of constraints. See the note at the top of this page for more
information: http://mallet.cs.umass.edu/ge-classification.php

* Fixed a bug in SVMLight2Vectors that could result in different
Alphabets when importing multiple files at once.

* Fixed a bug in SVMLight2Classify that allowed previously unobserved
features to be added to the data Alphabet, possibly resulting in
mismatching Classifier and InstanceList Alphabets.

* Fixed bugs in the search direction computation in ConjugateGradient.

* Added support for cross-validation in Vectors2Classify (in addition to
random subsamples of the data set).

* Added support for importing SVMLight data with Alphabets for which
growth is stopped.

* Added new options to Optimizers: it is now possible to set the
convergence tolerance for GradientAscent, and set the LineOptimizer for
LimitedMemoryBFGS
[ Mallet for Windows full changelog ]

Systems: Windows 7, WinXP, Windows Vista

Tags: Java package   Document Classification   extract information   Classification   document   tag  

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