Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22764#discussion_r226693546
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/BisectingKMeansModel.scala
---
@@ -225,13 +227,14 @@ object BisectingKMeansModel extends
Loader[BisectingKMeansModel] {
assert(formatVersion == thisFormatVersion)
val rootId = (metadata \ "rootId").extract[Int]
val distanceMeasure = (metadata \ "distanceMeasure").extract[String]
+ val trainingCost = (metadata \ "trainingCost").extract[Double]
--- End diff --
The answer is yes, because of versioning:
- all the versions of Spark released so far, use the versions `"1.0"`,
which is loaded/written with the `SaveLoadV1_0` class (see
https://github.com/apache/spark/pull/22764/files#diff-458b0e49bfc4a4dd993ea6cb66af4b4dR125);
- there can't be a model with version `"2.0"` without `trainingCost`,
because `SaveLoadV2_0` was introduced in a previous commit which lands only on
2.4 and has not yet been released.
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