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https://issues.apache.org/jira/browse/MAHOUT-616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003344#comment-13003344
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Sean Owen commented on MAHOUT-616:
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Hmm, surely there is a better approach that doesn't use "instanceof"
everywhere. I feel like it would be cleaner to give all Clusters a configure()
method and always call it? Even if it is a no-op for other implementations?
> Cannot use MahalanobisDistanceMeasure with Dirichlet clustering
> ---------------------------------------------------------------
>
> Key: MAHOUT-616
> URL: https://issues.apache.org/jira/browse/MAHOUT-616
> Project: Mahout
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 0.5
> Reporter: Vasil Vasilev
> Priority: Minor
> Fix For: 0.5
>
> Attachments: mahalanobis_fix.patch
>
>
> When Dirichlet clustering is run with DistanceMeasureClusterDistribution and
> MahalanobisDistanceMeasure the configure method of the distance measure is
> not called. In this way the configuration data cannot be supplied to the
> distance measure. In addition there is a bug in the
> MahalanobisDistanceMeasure that does not take into account the matrix class
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