dragon.ir.clustering.featurefilter

Interface FeatureFilter

All Known Implementing Classes:

AbstractFeatureFilter, DocFrequencyFilter, NullFeatureFilter

public interface FeatureFilter

Interface of unsupervised feature selector for text clustering.

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Davis Zhou

Method Summary

Modifier and Type	Method and Description
int	getSelectedFeatureNum()
void	initialize(IndexReader indexReader, IRDoc[] docSet) This method chooses a subset of features for text clustering
boolean	isSelected(int originalFeatureIndex)
int	map(int originalFeatureIndex) Map the old feature index to the index in the new feature space.

Method Detail

initialize

void initialize(IndexReader indexReader,
                IRDoc[] docSet)

This method chooses a subset of features for text clustering

Parameters:

indexReader - the index reader for a collection

docSet - the document set for clustering

isSelected

boolean isSelected(int originalFeatureIndex)

Parameters:

originalFeatureIndex - the index of the feature in the old feature space

Returns:

true if the given feature is selected for text clustering

getSelectedFeatureNum

int getSelectedFeatureNum()

Returns:

the number of selected features

map

int map(int originalFeatureIndex)

Map the old feature index to the index in the new feature space.

Parameters:

originalFeatureIndex - the index of the feature before feature selection

Returns:

the index of the feature the new space. If the feature is not selected, it will return -1.