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From "Randall Scarberry (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-584) KMeansPlusPlusClusterer incorrectly selects initial cluster centers and is unnecessarily slow
Date Wed, 01 Jun 2011 16:54:47 GMT

     [ https://issues.apache.org/jira/browse/MATH-584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Randall Scarberry updated MATH-584:
-----------------------------------

    Attachment: kmeans_plus_plus.patch

Patch file for correcting KMeansPlusPlusClusterer

> KMeansPlusPlusClusterer incorrectly selects initial cluster centers and is unnecessarily
slow
> ---------------------------------------------------------------------------------------------
>
>                 Key: MATH-584
>                 URL: https://issues.apache.org/jira/browse/MATH-584
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2
>         Environment: All environments
>            Reporter: Randall Scarberry
>              Labels: cluster, clustering
>             Fix For: 2.2.1
>
>         Attachments: kmeans_plus_plus.patch
>
>
> The chooseInitialClusters() method declares sum as an int, when it should be double.
 It also is quite slow because it contains a lot of unnecessary computation.  I'll attached
a patch which corrects the problems.
> I found the problems while comparing an optimized implementation of KMeans++ I've been
working on with the one in commons math. 

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