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Posted to dev@mahout.apache.org by "Ted Dunning (JIRA)" <ji...@apache.org> on 2013/06/11 22:37:20 UTC

[jira] [Commented] (MAHOUT-1255) Change BallKMeans weighting to use log(weight)

    [ https://issues.apache.org/jira/browse/MAHOUT-1255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13680645#comment-13680645 ] 

Ted Dunning commented on MAHOUT-1255:
-------------------------------------

I know how the testing inspired this change, but it still bugs the hell out of me.
                
> Change BallKMeans weighting to use log(weight)
> ----------------------------------------------
>
>                 Key: MAHOUT-1255
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1255
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.8
>            Reporter: Dan Filimon
>            Assignee: Dan Filimon
>            Priority: Minor
>
> Weirdness is happening in the reducer when doing k-means++ sampling by weights.
> Change from multiplying the probability with the weight to multiplying by 2 * log(weight).

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