weka.clusterers
Interface DensityBasedClusterer

All Superinterfaces:

Clusterer

All Known Implementing Classes:

AbstractDensityBasedClusterer, EM, MakeDensityBasedClusterer, RandomizableDensityBasedClusterer

public interface DensityBasedClusterer
extends Clusterer

Interface for clusterers that can estimate the density for a given instance. Implementations will typically extend AbstractDensityBasedClusterer.

Version:

$Revision: 1.9 $

Author:

Mark Hall (mhall@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz)

Method Summary

double[]	clusterPriors() Returns the prior probability of each cluster.
double	logDensityForInstance(Instance instance) Computes the density for a given instance.
double[]	logDensityPerClusterForInstance(Instance instance) Computes the log of the conditional density (per cluster) for a given instance.
double[]	logJointDensitiesForInstance(Instance inst) Returns the logs of the joint densities for a given instance.

Methods inherited from interface weka.clusterers.Clusterer

buildClusterer, clusterInstance, distributionForInstance, getCapabilities, numberOfClusters

Method Detail

clusterPriors

double[] clusterPriors()
                       throws java.lang.Exception

Returns the prior probability of each cluster.

Returns:

the prior probability for each cluster

Throws:

java.lang.Exception - if priors could not be returned successfully

logDensityPerClusterForInstance

double[] logDensityPerClusterForInstance(Instance instance)
                                         throws java.lang.Exception

Computes the log of the conditional density (per cluster) for a given instance.

Parameters:

instance - the instance to compute the density for

Returns:

an array containing the estimated densities

Throws:

java.lang.Exception - if the density could not be computed successfully

logDensityForInstance

double logDensityForInstance(Instance instance)
                             throws java.lang.Exception

Computes the density for a given instance.

Parameters:

instance - the instance to compute the density for

Returns:

the density.

Throws:

java.lang.Exception - if the density could not be computed successfully

logJointDensitiesForInstance

double[] logJointDensitiesForInstance(Instance inst)
                                      throws java.lang.Exception

Returns the logs of the joint densities for a given instance.

Parameters:

inst - the instance

Returns:

the array of values

Throws:

java.lang.Exception - if values could not be computed