feature_filtering
Class EntropyBasedFiltering

java.lang.Object
  feature_filtering.AbstractFeatureFiltering
      feature_filtering.EntropyBasedFiltering

public class EntropyBasedFiltering
extends AbstractFeatureFiltering

This class is used for entropy-based filtering.

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

private weka.core.Instances	descriptorDatasetFormat The format of the dataset used to create the filter.
private weka.filters.unsupervised.attribute.Discretize	discretizationFilter The discretization filter to use.
static double[]	percentiles Percentile values for which thresholds have been pre-calculated.
private double	threshold The threshold to apply, i.e. features with lower entropy will be filtered.
static double[]	thresholds Corresponding thresholds for the percentiles above.

Constructor Summary

EntropyBasedFiltering(java.lang.String serializedFilterFileName, java.lang.String serializedInstancesFileName, 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.
private void	setDescriptorDatasetFormat(java.lang.String serializedInstancesFile)
private void	setDiscretizationFilter(java.lang.String serializedFilterFile)

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.

discretizationFilter

private weka.filters.unsupervised.attribute.Discretize discretizationFilter

The discretization filter to use.

descriptorDatasetFormat

private weka.core.Instances descriptorDatasetFormat

The format of the dataset used to create the filter. This format is the same for all methods, it is the format of a dataset with the descriptors.

threshold

private double threshold

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

Constructor Detail

EntropyBasedFiltering

public EntropyBasedFiltering(java.lang.String serializedFilterFileName,
                             java.lang.String serializedInstancesFileName,
                             double percentage)
                      throws java.lang.Exception

Constructor

Parameters:

serializedFilterFileName - a serialized filter object

serializedInstancesFileName - a serialized instances object

percentage - the threshold

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

setDescriptorDatasetFormat

private void setDescriptorDatasetFormat(java.lang.String serializedInstancesFile)
                                 throws java.lang.Exception

Throws:

java.lang.Exception

setDiscretizationFilter

private void setDiscretizationFilter(java.lang.String serializedFilterFile)
                              throws java.lang.Exception

Throws:

java.lang.Exception