Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22058#discussion_r209027132
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/evaluation/ClusteringEvaluator.scala
---
@@ -119,6 +119,8 @@ class ClusteringEvaluator @Since("2.3.0")
(@Since("2.3.0") override val uid: Str
df, $(predictionCol), $(featuresCol))
case ("silhouette", "cosine") =>
CosineSilhouette.computeSilhouetteScore(df, $(predictionCol),
$(featuresCol))
+ case (mn, dm) =>
+ throw new IllegalArgumentException(s"($mn, $dm) is not matched in
evaluate")
--- End diff --
This is OK, but doesn't really add much beyond what the MatchError would
have said. Worth a message like "No support for metric $mn, distance $dm"?
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