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https://issues.apache.org/jira/browse/MATH-1524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057940#comment-17057940
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Gilles Sadowski commented on MATH-1524:
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{quote}The Cluster.centroid() may only used in Clustering and Evaluator, it can
be package private.
{quote}
Either I'm missing something, or this is backwards (from an API POV): the
{{centroid()}} provides a property of the instance; it should thus be
accessible by users.
{quote}getCenter can be package private, except centers should be displayed:
[...]
{quote}
I don't get that; If the method is "private", users (like a GUI application)
won't be able to call it...
{quote}[cluster_comparison.png|http://commons.apache.org/proper/commons-math/images/userguide/cluster_comparison.png]
{quote}
In that picture, couldn't the centers be computed using the {{centroid()}}
method of class {{Cluster}}?
> "chooseInitialCenters" should move out from KMeansPlusPlusClusterer
> -------------------------------------------------------------------
>
> Key: MATH-1524
> URL: https://issues.apache.org/jira/browse/MATH-1524
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Chen Tao
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> There are two reason for "chooseInitialCenters" should be move out from
> "KMeansPlusPlusClusterer":
> # k-means++ clusterer is a special case of k-means clusterer, that k-means++
> initialize the cluster centers with k-means++ algorithm. Another case is
> initialize the cluster centers with random points.
> # The mini batch k-means will reuse "chooseInitialCenters".
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