Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/15018#discussion_r92920619 --- Diff: mllib/src/main/scala/org/apache/spark/mllib/regression/IsotonicRegression.scala --- @@ -328,74 +336,68 @@ 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 - - var i = start - while (i <= end) { - input(i) = (weightedSum / weight, input(i)._2, input(i)._3) - i = i + 1 - } + /* + 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 --- End diff -- blockBounds(start) is the _end_ of a block? this is reflected in your helper functions below but it seems reversed. Can you double check and elaborate a bit?
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