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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/05/31 14:04:32 UTC

[GitHub] [spark] srowen opened a new pull request #24756: [SPARK-27896][ML] Fix definition of clustering silhouette coefficient for 1-element clusters

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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