Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/19208#discussion_r149227049
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -108,11 +111,19 @@ abstract class MLWriter extends BaseReadWrite with
Logging {
protected def saveImpl(path: String): Unit
/**
- * `option()` handles extra options. If subclasses need to support extra
options, override this
- * method.
+ * Map store extra options for this writer.
+ */
+ protected val optionMap: mutable.Map[String, String] = new
mutable.HashMap[String, String]()
+
+ /**
+ * `option()` handles extra options.
--- End diff --
"Adds an option to the underlying MLWriter. See the documentation for the
specific model's writer for possible options. The option name (key) is
case-insensitive."
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