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## 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: 5987 $
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

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