Package weka.clusterers
Interface DensityBasedClusterer
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- 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)
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description double[]
clusterPriors()
Returns the prior probability of each cluster.double[]
distributionForInstance(Instance instance)
Returns the cluster probability distribution for an instance.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, getCapabilities, numberOfClusters
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Method Detail
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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
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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
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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
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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
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distributionForInstance
double[] distributionForInstance(Instance instance) throws java.lang.Exception
Returns the cluster probability distribution for an instance.- Specified by:
distributionForInstance
in interfaceClusterer
- Parameters:
instance
- the instance to be clustered- Returns:
- the probability distribution
- Throws:
java.lang.Exception
- if computation fails
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