Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22875
Yes, the problem is that there is also the `computeCost` of
`BisectingKMeans`. I proposed to deprecate it in 2.4 and remove in 3.0, but I
didn't manage to have it done for 2.4 (please refer to the discussions on
https://github.com/apache/spark/pull/22764 and
https://github.com/apache/spark/pull/22756 for the details). So `computeCost`
of `BisectingKMeans` cannot be removed in 3.0 (unfortunately). The examples for
KMeans have already been updated using ClusteringEvaluator in #19676.
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