Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22764
For KMeans we used the ClusteringEvaluator in the examples. Actually, the
training cost is not a good way to evaluate a dataset (the evaluation should be
done on a dataset different from the training one).
Maybe we can also add this API in the example to show that it exists, but I
have seen no example with a summary shown so...
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