Github user alokob commented on a diff in the pull request:
https://github.com/apache/spark/pull/16355#discussion_r93470185
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/BisectingKMeans.scala ---
@@ -339,10 +339,14 @@ private object BisectingKMeans extends Serializable {
assignments.map { case (index, v) =>
if (divisibleIndices.contains(index)) {
val children = Seq(leftChildIndex(index), rightChildIndex(index))
- val selected = children.minBy { child =>
- KMeans.fastSquaredDistance(newClusterCenters(child), v)
+ if (children.length > 0) {
--- End diff --
I can see following possibility to get java.util.NoSuchElementException in
the original code.
leftChildIndex(index) , this methods returns index*2 and
rightChildIndex(index) returns index*2+1. If the Map object newClusterCenters
does not have entries belonging to leftChildIndex(index) or
rightChildIndex(index) .
Here we need to have this check newClusterCenters.contains(child) , to
avoid this issue.
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