Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15018#discussion_r92231712
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/regression/IsotonicRegression.scala
---
@@ -344,27 +344,30 @@ class IsotonicRegression private (private var
isotonic: Boolean) extends Seriali
}
var i = 0
- val len = input.length
- while (i < len) {
- var j = i
-
- // Find monotonicity violating sequence, if any.
- while (j < len - 1 && input(j)._1 > input(j + 1)._1) {
- j = j + 1
- }
+ val n = input.length - 1
+ var notFinished = true
+
+ while (notFinished) {
+ i = 0
+ notFinished = false
+
+ // Iterate through the data, fix any monotonicity violations we find
+ // We may need to do this multiple times, as pooling can introduce
violations
+ // at locations that were previously fine.
+ while (i < n) {
+ var j = i
+
+ // Find next monotonicity violating sequence, if any.
+ while (j < n && input(j)._1 >= input(j + 1)._1) {
--- End diff --
The condition changed to >= here on purpose right? you're now looking for a
region that's non-increasing, not just strictly decreasing. Just checking.
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