Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/18428#discussion_r124185896
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tuning/ValidatorParams.scala ---
@@ -126,10 +126,22 @@ private[ml] object ValidatorParams {
extraMetadata: Option[JObject] = None): Unit = {
import org.json4s.JsonDSL._
+ var numParamsNotJson = 0
val estimatorParamMapsJson = compact(render(
instance.getEstimatorParamMaps.map { case paramMap =>
paramMap.toSeq.map { case ParamPair(p, v) =>
- Map("parent" -> p.parent, "name" -> p.name, "value" ->
p.jsonEncode(v))
+ v match {
+ case writeableObj: MLWritable =>
--- End diff --
Per my comment below in the load() section, this should be restricted to
DefaultParamsWritable for now. Could you please do so, but also add a check
which throws an error if `v` is MLWritable but not DefaultParamsWritable?
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