srowen opened a new pull request #24756: [SPARK-27896][ML] Fix definition of clustering silhouette coefficient for 1-element clusters URL: https://github.com/apache/spark/pull/24756 ## What changes were proposed in this pull request? Single-point clusters should have silhouette score of 0, according to the original paper and scikit implementation. ## How was this patch tested? Existing test suite + new test case.
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