Github user yinxusen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11119#discussion_r80630417
--- Diff: mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
---
@@ -81,11 +81,23 @@ private[clustering] trait KMeansParams extends Params
with HasMaxIter with HasFe
def getInitSteps: Int = $(initSteps)
/**
+ * Param for KMeansModel to use for warm start.
+ * @group param
+ */
+ final val initialModel: Param[KMeansModel] =
+ new Param[KMeansModel](this, "initialModel", "A KMeansModel for warm
start.")
+
+ /**
* Validates and transforms the input schema.
* @param schema input schema
* @return output schema
*/
protected def validateAndTransformSchema(schema: StructType): StructType
= {
+ if (isDefined(initialModel)) {
+ val kOfInitialModel =
$(initialModel).parentModel.clusterCenters.length
+ require(kOfInitialModel == $(k),
+ s"mismatched cluster count, ${$(k)} cluster centers required but
$kOfInitialModel found.")
+ }
--- End diff --
Good catch, I move the check to fit()
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