pt.tumba.ngram.svm
Class SVMCategorizer

java.lang.Object
  pt.tumba.ngram.svm.SVMCategorizer

public class SVMCategorizer
extends java.lang.Object

Simple, easy-to-use, and efficient software for SVM classification and regression, based on the LIBSVM implementation of Chin-Chung Chang and Chin-Jen Lin. It can solve C-SVM classification, nu-SVM classification, one-class-SVM, epsilon-SVM regression, and nu-SVM regression. It also provides an automatic model selection tool for C-SVM classification, and multiclass classification through a "one-against-one" approach .

The original implementation was much less "object-oriented", and didn't follow the usual conventions for Java programs. Besides major code refactoring, additional functionalities were also added:

Field Summary

private boolean	crossValidation
private java.lang.String	errorMsg
private java.lang.String	inputFileName
protected SVMModel	model Description of the Field
private java.lang.String	modelFileName
protected java.lang.String[]	names
private int	nrFold
protected SVMParameter	param
protected SVMProblem	prob
protected java.util.List	sortedGrams

Constructor Summary

SVMCategorizer()
Construct an uninitialized Cathegorizer.

SVMCategorizer(java.lang.String dirName)
Construct an Cathegorizer from a whole Directory of resources.

SVMCategorizer(java.lang.String[] fileNames)
Construct an Cathegorizer from a List of resource file names.

Method Summary

private void	doCrossValidation()
private static java.util.List	exchangePos(java.util.List v, int p1, int p2) Exchange two values in a list
private static void	exitWithHelp()
private void	init(java.io.File fi, java.lang.String[] names) Fetch the set of file resources.
static void	main(java.lang.String[] argv) Sample application, like the text_cat main mode.
java.lang.String	match(java.io.File f)
private static void	predict(java.io.BufferedReader input, java.io.DataOutputStream output, SVMModel model, int predict_probability)
private void	readProblem()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

model

protected SVMModel model

Description of the Field

param

protected SVMParameter param

prob

protected SVMProblem prob

names

protected java.lang.String[] names

sortedGrams

protected java.util.List sortedGrams

inputFileName

private java.lang.String inputFileName

modelFileName

private java.lang.String modelFileName

errorMsg

private java.lang.String errorMsg

crossValidation

private boolean crossValidation

nrFold

private int nrFold

Constructor Detail

SVMCategorizer

public SVMCategorizer()

Construct an uninitialized Cathegorizer.

SVMCategorizer

public SVMCategorizer(java.lang.String dirName)
               throws TCatNGException,
                      java.io.FileNotFoundException

Construct an Cathegorizer from a whole Directory of resources.

Parameters:

dirName - Description of the Parameter

Throws:

NGramException - Description of the Exception

java.io.FileNotFoundException - Description of the Exception

TCatNGException

SVMCategorizer

public SVMCategorizer(java.lang.String[] fileNames)
               throws TCatNGException,
                      java.io.FileNotFoundException

Construct an Cathegorizer from a List of resource file names.

Parameters:

fileNames - Description of the Parameter

Throws:

NGramException - Description of the Exception

java.io.FileNotFoundException - Description of the Exception

TCatNGException

Method Detail

init

private final void init(java.io.File fi,
                        java.lang.String[] names)
                 throws TCatNGException,
                        java.io.FileNotFoundException

Fetch the set of file resources.

Parameters:

fi - Description of the Parameter

names - Description of the Parameter

Throws:

NGramException - Description of the Exception

java.io.FileNotFoundException - Description of the Exception

TCatNGException

exchangePos

private static java.util.List exchangePos(java.util.List v,
                                          int p1,
                                          int p2)

Exchange two values in a list

Parameters:

v - The original list

p1 - The index of the first element

p2 - The index of the second element

Returns:

The list with the two elements exchanged

match

public java.lang.String match(java.io.File f)

main

public static void main(java.lang.String[] argv)

Sample application, like the text_cat main mode.

Parameters:

args - The command line arguments

predict

private static void predict(java.io.BufferedReader input,
                            java.io.DataOutputStream output,
                            SVMModel model,
                            int predict_probability)
                     throws java.io.IOException

Throws:

java.io.IOException

exitWithHelp

private static void exitWithHelp()

doCrossValidation

private void doCrossValidation()

readProblem

private void readProblem()
                  throws java.io.IOException

Throws:

java.io.IOException