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[SPARK-31768][ML][FOLLOWUP] add getMetrics in Evaluators: cleanup #31334

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[SPARK-31768][ML][FOLLOWUP] add getMetrics in Evaluators: cleanup #31334

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9 changes: 7 additions & 2 deletions mllib/src/main/scala/org/apache/spark/ml/evaluation/ClusteringMetrics.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -37,13 +37,18 @@ class ClusteringMetrics private[spark](dataset: Dataset[_]) {

def getDistanceMeasure: String = distanceMeasure

def setDistanceMeasure(value: String) : Unit = distanceMeasure = value
def setDistanceMeasure(value: String) : this.type = {
require(value.equalsIgnoreCase("squaredEuclidean") ||
value.equalsIgnoreCase("cosine"))
distanceMeasure = value
this
}

/**
* Returns the silhouette score
*/
@Since("3.1.0")
lazy val silhouette: Double = {
def silhouette(): Double = {
val columns = dataset.columns.toSeq
if (distanceMeasure.equalsIgnoreCase("squaredEuclidean")) {
SquaredEuclideanSilhouette.computeSilhouetteScore(
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