Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14948#discussion_r77435330
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/clustering/KMeansSuite.scala ---
@@ -75,7 +75,7 @@ class KMeansSuite extends SparkFunSuite with
MLlibTestSparkContext {
// Make sure code runs.
var model = KMeans.train(data, k = 2, maxIterations = 1)
- assert(model.clusterCenters.size === 2)
+ assert(model.clusterCenters.size === 1)
--- End diff --
The optimization above that returns early if # centers <= k causes this
behavior change. I think the new behavior is more correct, because before you
could get duplicate centers.
This actually fixed SPARK-3261 too
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