Github user MLnick commented on a diff in the pull request:
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
    @@ -446,6 +459,11 @@ private[ml] object DefaultParamsReader {
         val cls = Utils.classForName(metadata.className)
    +  def loadInitialModel[M <: Model[M]](path: String, sc: SparkContext): 
Try[M] = {
    +    val initialModelPath = new Path(path, "initialModel").toString
    +    Try(loadParamsInstance[M](initialModelPath, sc))
    --- End diff --
    I don't think the overhead is that large, and if there is no model then it 
should fail fast as the directory won't exist.

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