feature_filtering
Class VarianceBasedFiltering

java.lang.Object
  feature_filtering.AbstractFeatureFiltering
      feature_filtering.VarianceBasedFiltering

public class VarianceBasedFiltering
extends AbstractFeatureFiltering

This class is used for variance-based filtering.

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

static double[]	percentiles Percentile values for which thresholds have been pre-calculated.
private double	threshold The threshold to apply, i.e. features with lower variance than will be filtered.
static double[]	thresholds Corresponding thresholds for the percentiles above.

Constructor Summary

VarianceBasedFiltering(double percentage)
Constructor

Method Summary

protected java.util.ArrayList<double[]>	filterInternal(java.util.ArrayList<double[]> descriptors) Subclasses should provide the implementation.
protected double[][]	filterInternal(double[][] descriptors) Subclasses should provide the implementation.

Methods inherited from class feature_filtering.AbstractFeatureFiltering

calculatePercentileValuesEntropy, calculatePercentileValuesVariance, entropyCalculation, filter, filter, main, varianceCalculation

Methods inherited from class java.lang.Object

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

Field Detail

percentiles

public static double[] percentiles

Percentile values for which thresholds have been pre-calculated.

thresholds

public static double[] thresholds

Corresponding thresholds for the percentiles above.

threshold

private double threshold

The threshold to apply, i.e. features with lower variance than will be filtered.

Constructor Detail

VarianceBasedFiltering

public VarianceBasedFiltering(double percentage)
                       throws java.lang.Exception

Constructor

Parameters:

percentage -

Throws:

java.lang.Exception

Method Detail

filterInternal

protected double[][] filterInternal(double[][] descriptors)
                             throws java.lang.Exception

Description copied from class: AbstractFeatureFiltering

Subclasses should provide the implementation.

Specified by:

filterInternal in class AbstractFeatureFiltering

Returns:

the filtered features

Throws:

java.lang.Exception

filterInternal

protected java.util.ArrayList<double[]> filterInternal(java.util.ArrayList<double[]> descriptors)
                                                throws java.lang.Exception

Description copied from class: AbstractFeatureFiltering

Subclasses should provide the implementation.

Specified by:

filterInternal in class AbstractFeatureFiltering

Returns:

the filtered features

Throws:

java.lang.Exception