Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/9971#discussion_r57489811
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -352,3 +359,128 @@ private[ml] object DefaultParamsReader {
cls.getMethod("read").invoke(null).asInstanceOf[MLReader[T]].load(path)
}
}
+
+/**
+ * Default Meta-Pipeline read and write implementation.
+ */
+private[ml] trait MetaPipelineReadWrite {
+ /**
+ * Examine the given estimator (which may be a compound estimator) and
extract a mapping
+ * from UIDs to corresponding [[Params]] instances.
+ */
+ def getUidMap(instance: Params): Map[String, Params] = {
+ val uidList = getUidMapImpl(instance)
+ val uidMap = uidList.toMap
+ if (uidList.size != uidMap.size) {
+ throw new RuntimeException("CrossValidator.load found a compound
estimator with stages" +
--- End diff --
"CrossValidator" --> ```${instance.getClass.getName}```
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