Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/17117#discussion_r104819439 --- Diff: mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala --- @@ -335,17 +369,70 @@ class KMeans @Since("1.5.0") ( model } + /** + * Check validity for interactions between parameters. + */ + private def assertInitialModelValid(): Unit = { + if ($(initMode) == MLlibKMeans.K_MEANS_INITIAL_MODEL) { + if (isSet(initialModel)) { + val initialModelK = $(initialModel).parentModel.k + if (initialModelK != $(k)) { + throw new IllegalArgumentException("The initial model's cluster count = " + + s"$initialModelK, mismatched with k = $k.") + } + } else { + throw new IllegalArgumentException("Users must set param initialModel if you choose " + + "'initialModel' as the initialization algorithm.") + } + } else { + if (isSet(initialModel)) { + logWarning(s"Param initialModel will take no effect when initMode is $initMode.") + } + } + } + @Since("1.5.0") override def transformSchema(schema: StructType): StructType = { + assertInitialModelValid() --- End diff -- Why this is not checked in `fit`?
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