de.bwaldvogel.liblinear

Class Linear

java.lang.Object

de.bwaldvogel.liblinear.Linear

public class Linear
extends java.lang.Object

Java port of liblinear

The usage should be pretty similar to the C version of liblinear.

Please consider reading the README file of liblinear.

The port was done by Benedikt Waldvogel (mail at bwaldvogel.de)

Constructor Summary

Constructors

Constructor and Description
Linear()

Method Summary

Modifier and Type	Method and Description
static double[]	copyOf(double[] original, int newLength) Java5 'backport' of Arrays.copyOf
static int[]	copyOf(int[] original, int newLength) Java5 'backport' of Arrays.copyOf
static void	crossValidation(Problem prob, Parameter param, int nr_fold, double[] target)
static void	disableDebugOutput()
static void	enableDebugOutput()
static ParameterSearchResult	findParameterC(Problem prob, Parameter param, int nr_fold, double start_C, double max_C)
static int	getVersion()
static Model	loadModel(java.io.File modelFile) Loads the model from the file with ISO-8859-1 charset.
static Model	loadModel(java.io.Reader inputReader) Loads the model from inputReader.
static double	predict(Model model, Feature[] x)
static double	predictProbability(Model model, Feature[] x, double[] prob_estimates)
static double	predictValues(Model model, Feature[] x, double[] dec_values)
static void	resetRandom() resets the PRNG this is i.a.
static void	saveModel(java.io.File modelFile, Model model) Writes the model to the file with ISO-8859-1 charset.
static void	saveModel(java.io.Writer modelOutput, Model model) Writes the model to the modelOutput.
static void	setDebugOutput(java.io.PrintStream debugOutput)
static Model	train(Problem prob, Parameter param)

Methods inherited from class java.lang.Object

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

Constructor Detail

Linear

public Linear()

Method Detail

crossValidation

public static void crossValidation(Problem prob,
                                   Parameter param,
                                   int nr_fold,
                                   double[] target)

Parameters:

target - predicted classes

findParameterC

public static ParameterSearchResult findParameterC(Problem prob,
                                                   Parameter param,
                                                   int nr_fold,
                                                   double start_C,
                                                   double max_C)

copyOf

public static double[] copyOf(double[] original,
                              int newLength)

Java5 'backport' of Arrays.copyOf

copyOf

public static int[] copyOf(int[] original,
                           int newLength)

Java5 'backport' of Arrays.copyOf

loadModel

public static Model loadModel(java.io.Reader inputReader)
                       throws java.io.IOException

Loads the model from inputReader. It uses Locale.ENGLISH for number formatting.

Note: The inputReader is NOT closed after reading or in case of an exception.

Throws:

java.io.IOException

loadModel

public static Model loadModel(java.io.File modelFile)
                       throws java.io.IOException

Loads the model from the file with ISO-8859-1 charset. It uses Locale.ENGLISH for number formatting.

Throws:

java.io.IOException

predict

public static double predict(Model model,
                             Feature[] x)

predictProbability

public static double predictProbability(Model model,
                                        Feature[] x,
                                        double[] prob_estimates)
                                 throws java.lang.IllegalArgumentException

Throws:

java.lang.IllegalArgumentException - if model is not probabilistic (see Model.isProbabilityModel())

predictValues

public static double predictValues(Model model,
                                   Feature[] x,
                                   double[] dec_values)

saveModel

public static void saveModel(java.io.Writer modelOutput,
                             Model model)
                      throws java.io.IOException

Writes the model to the modelOutput. It uses Locale.ENGLISH for number formatting.

Note: The modelOutput is closed after reading or in case of an exception.

Throws:

java.io.IOException

saveModel

public static void saveModel(java.io.File modelFile,
                             Model model)
                      throws java.io.IOException

Writes the model to the file with ISO-8859-1 charset. It uses Locale.ENGLISH for number formatting.

Throws:

java.io.IOException

train

public static Model train(Problem prob,
                          Parameter param)

Throws:

java.lang.IllegalArgumentException - if the feature nodes of prob are not sorted in ascending order

disableDebugOutput

public static void disableDebugOutput()

enableDebugOutput

public static void enableDebugOutput()

setDebugOutput

public static void setDebugOutput(java.io.PrintStream debugOutput)

getVersion

public static int getVersion()

resetRandom

public static void resetRandom()

resets the PRNG this is i.a. needed for regression testing (eg. the Weka wrapper)