[jira] [Resolved] (MATH-548) KMeansPlusPlusClusterer should run multiple trials

["Luc Maisonobe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luc Maisonobe resolved MATH-548.
--------------------------------

    Resolution: Fixed

Fixed in subversion tree as of r1137759.

Thanks for the report


> KMeansPlusPlusClusterer should run multiple trials
> --------------------------------------------------
>
>                 Key: MATH-548
>                 URL: https://issues.apache.org/jira/browse/MATH-548
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Nate Paymer
>            Priority: Minor
>
> The interface and documentation for KMeansPlusPlusClusterer imply that a single call to cluster() is sufficient to get the optimal set of clusters.  But this isn't true -- practically every client should be calling cluster() multiple times, selecting the best resulting set of clusters.  It seems to me that rather than forcing every client to implement this functionality, it should be placed directly in the KMeansPlusPlusClusterer class.
> I propose adding a new method to KMeansPlusPlusClusterer:
>   List<Cluster<T>> cluster(Collection<T> points, int k, int numTrials, int maxIterationsPerTrial)
> which calls the existing cluster() method numTrials times, returning the best result.

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