Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15018#discussion_r93229282
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/regression/IsotonicRegression.scala
---
@@ -328,74 +336,69 @@ class IsotonicRegression private (private var
isotonic: Boolean) extends Seriali
return Array.empty
}
- // Pools sub array within given bounds assigning weighted average
value to all elements.
- def pool(input: Array[(Double, Double, Double)], start: Int, end:
Int): Unit = {
- val poolSubArray = input.slice(start, end + 1)
- val weightedSum = poolSubArray.map(lp => lp._1 * lp._3).sum
- val weight = poolSubArray.map(_._3).sum
+ // Keeps track of the start and end indices of the blocks.
blockBounds(start) gives the
+ // index of the end of the block and blockBounds(end) gives the index
of the start of the
+ // block. Entries that are not the start or end of the block are
meaningless. The idea is that
--- End diff --
I'm still not sure about this comment -- how can `blockBounds(x)` be both
the start and end of a block? the implementation below is identical.
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