Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/19278#discussion_r140373382
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -396,17 +396,24 @@ private[ml] object DefaultParamsReader {
/**
* Extract Params from metadata, and set them in the instance.
- * This works if all Params implement
[[org.apache.spark.ml.param.Param.jsonDecode()]].
+ * This works if all Params (except params included by `skipParams`
list) implement
+ * [[org.apache.spark.ml.param.Param.jsonDecode()]].
+ *
+ * The params included in `skipParams` won't be set. This is useful if
some params don't
--- End diff --
Document params using ```@param```
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