[jira] [Commented] (MATH-1521) A interface to implements various of clusters external measurers

["Gilles Sadowski (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17056195#comment-17056195 ] 

Gilles Sadowski commented on MATH-1521:
---------------------------------------

Please provide a use-case.

> A interface to implements various of clusters external measurers
> ----------------------------------------------------------------
>
>                 Key: MATH-1521
>                 URL: https://issues.apache.org/jira/browse/MATH-1521
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Chen Tao
>            Priority: Minor
>
> There are many clusters evaluation algorithm:
> [scikit-learn clustering-performance-evaluation|https://scikit-learn.org/stable/modules/clustering.html#clustering-performance-evaluation]
> They can be divided into 2 categories: “External Measurers” and "Internal Measurers".
> The “External Measurers” evaluator clusters reference to another clusters.
> As opposed to “Internal Measurers”, the "External Measurers" may be:
> {code:java}
> public interface ClusterExternalEvaluator {
>     /**
>      * @param cList List of clusters.
>      * @return the score attributed by the evaluator.
>      */
>     <T extends Clusterable> double score(List<? extends Cluster<? extends T>> clusters1, List<? extends Cluster<? extends T>> clusters2);
>     /**
>      * @param a Score computed by this evaluator.
>      * @param b Score computed by this evaluator.
>      * @return true if the evaluator considers score {@code a} is
>      * considered better than score {@code b}.
>      */
>     boolean isBetterScore(double a, double b);
> {code}



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