Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/9674#discussion_r44987039 --- Diff: mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala --- @@ -200,4 +235,121 @@ class PipelineModel private[ml] ( override def copy(extra: ParamMap): PipelineModel = { new PipelineModel(uid, stages.map(_.copy(extra))).setParent(parent) } + + override def write: Writer = new PipelineModelWriter(this) +} + +object PipelineModel extends Readable[PipelineModel] { + + override def read: Reader[PipelineModel] = new PipelineModelReader + + override def load(path: String): PipelineModel = read.load(path) +} + +private[ml] class PipelineModelWriter(instance: PipelineModel) extends Writer { + + PipelineSharedWriter.validateStages(instance.stages.asInstanceOf[Array[PipelineStage]]) + + override protected def saveImpl(path: String): Unit = PipelineSharedWriter.saveImpl(instance, + instance.stages.asInstanceOf[Array[PipelineStage]], sc, path) +} + +private[ml] class PipelineModelReader extends Reader[PipelineModel] { + + /** Checked against metadata when loading model */ + private val className = "org.apache.spark.ml.PipelineModel" + + override def load(path: String): PipelineModel = { + val (uid: String, stages: Array[PipelineStage]) = + PipelineSharedReader.load(className, sc, path) + val transformers = stages map { + case stage: Transformer => stage + case stage => throw new RuntimeException(s"PipelineModel.read loaded a stage but found it" + --- End diff -- minor: `stage` -> `other`
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