viirya commented on a change in pull request #20146: [SPARK-11215][ML] Add
multiple columns support to StringIndexer
URL: https://github.com/apache/spark/pull/20146#discussion_r243732989
##########
File path: mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala
##########
@@ -172,37 +255,63 @@ object StringIndexer extends
DefaultParamsReadable[StringIndexer] {
@Since("1.6.0")
override def load(path: String): StringIndexer = super.load(path)
+
+ // Returns a function used to sort strings by frequency (ascending or
descending).
+ // In case of equal frequency, it sorts strings by alphabet (ascending).
+ private[feature] def getSortFunc(
+ ascending: Boolean): ((String, Long), (String, Long)) => Boolean = {
+ (a: (String, Long), b: (String, Long)) => {
+ if (a._2 == b._2) {
+ a._1 < b._1
+ } else {
+ if (ascending) a._2 < b._2 else a._2 > b._2
Review comment:
Returned two functions now.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
