Github user MLnick commented on a diff in the pull request:
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala 
    @@ -303,6 +312,20 @@ class KMeans @Since("1.5.0") (
       def setSeed(value: Long): this.type = set(seed, value)
    +  /** @group setParam */
    +  @Since("2.1.0")
    +  def setInitialModel(value: KMeansModel): this.type = {
    +    val kOfInitialModel = value.parentModel.clusterCenters.length
    +    if (isSet(k)) {
    +      require(kOfInitialModel == $(k),
    --- End diff --
    As discussed elsewhere, at set time I think we can log a warning and let 
`initialModel` take precedence.

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