weka.classifiers.evaluation

Class EvaluationUtils

java.lang.Object

weka.classifiers.evaluation.EvaluationUtils

All Implemented Interfaces:

RevisionHandler

public class EvaluationUtils
extends java.lang.Object
implements RevisionHandler

Contains utility functions for generating lists of predictions in various manners.

Version:

$Revision: 1.11 $

Author:

Len Trigg (len@reeltwo.com)

Constructor Summary

Constructors

Constructor and Description
EvaluationUtils()

Method Summary

Modifier and Type	Method and Description
FastVector	getCVPredictions(Classifier classifier, Instances data, int numFolds) Generate a bunch of predictions ready for processing, by performing a cross-validation on the supplied dataset.
Prediction	getPrediction(Classifier classifier, Instance test) Generate a single prediction for a test instance given the pre-trained classifier.
java.lang.String	getRevision() Returns the revision string.
int	getSeed() Gets the seed for randomization during cross-validation
FastVector	getTestPredictions(Classifier classifier, Instances test) Generate a bunch of predictions ready for processing, by performing a evaluation on a test set assuming the classifier is already trained.
FastVector	getTrainTestPredictions(Classifier classifier, Instances train, Instances test) Generate a bunch of predictions ready for processing, by performing a evaluation on a test set after training on the given training set.
void	setSeed(int seed) Sets the seed for randomization during cross-validation

Methods inherited from class java.lang.Object

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

Constructor Detail

EvaluationUtils

public EvaluationUtils()

Method Detail

setSeed

public void setSeed(int seed)

Sets the seed for randomization during cross-validation

getSeed

public int getSeed()

Gets the seed for randomization during cross-validation

getCVPredictions

public FastVector getCVPredictions(Classifier classifier,
                                   Instances data,
                                   int numFolds)
                            throws java.lang.Exception

Generate a bunch of predictions ready for processing, by performing a cross-validation on the supplied dataset.

Parameters:

classifier - the Classifier to evaluate

data - the dataset

numFolds - the number of folds in the cross-validation.

Throws:

java.lang.Exception - if an error occurs

getTrainTestPredictions

public FastVector getTrainTestPredictions(Classifier classifier,
                                          Instances train,
                                          Instances test)
                                   throws java.lang.Exception

Generate a bunch of predictions ready for processing, by performing a evaluation on a test set after training on the given training set.

Parameters:

classifier - the Classifier to evaluate

train - the training dataset

test - the test dataset

Throws:

java.lang.Exception - if an error occurs

getTestPredictions

public FastVector getTestPredictions(Classifier classifier,
                                     Instances test)
                              throws java.lang.Exception

Generate a bunch of predictions ready for processing, by performing a evaluation on a test set assuming the classifier is already trained.

Parameters:

classifier - the pre-trained Classifier to evaluate

test - the test dataset

Throws:

java.lang.Exception - if an error occurs

getPrediction

public Prediction getPrediction(Classifier classifier,
                                Instance test)
                         throws java.lang.Exception

Generate a single prediction for a test instance given the pre-trained classifier.

Parameters:

classifier - the pre-trained Classifier to evaluate

test - the test instance

Throws:

java.lang.Exception - if an error occurs

getRevision

public java.lang.String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision