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LIBSVM is an integrated software for support vector classification, (C-SVC,
nu-SVC), regression (epsilon-SVR, nu-SVR) and distribution estimation
(one-class SVM). It supports multi-class classification.

LIBSVM provides a simple interface where users can easily link it with their
own programs. Main features of LIBSVM include

  * Different SVM formulations
  * Efficient multi-class classification
  * Cross validation for model selection
  * Probability estimates
  * Weighted SVM for unbalanced data
  * Both C++ and Java sources
  * GUI demonstrating SVM classification and regression
  * Python, R (also Splus), MATLAB, Perl, Ruby, Weka, Common LISP and LabVIEW
    interfaces. C# .NET code is available.
    It's also included in some learning environments: YALE and PCP.
  * Automatic model selection which can generate contour of cross valiation
    accuracy.