Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/21393#discussion_r189941850
--- Diff: mllib/src/main/scala/org/apache/spark/ml/fpm/PrefixSpan.scala ---
@@ -35,7 +37,87 @@ import org.apache.spark.sql.types.{ArrayType, LongType,
StructField, StructType}
*/
@Since("2.4.0")
@Experimental
-object PrefixSpan {
+final class PrefixSpan(@Since("2.4.0") override val uid: String) extends
Params {
--- End diff --
In the doc, mention that this class is not yet an Estimator/Transformer and
link to `findFrequentSequentialPatterns` method.
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