Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15963#discussion_r88906149
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/optimization/LBFGS.scala ---
@@ -241,16 +241,27 @@ object LBFGS extends Logging {
val bcW = data.context.broadcast(w)
val localGradient = gradient
- val (gradientSum, lossSum) = data.treeAggregate((Vectors.zeros(n),
0.0))(
- seqOp = (c, v) => (c, v) match { case ((grad, loss), (label,
features)) =>
- val l = localGradient.compute(
- features, label, bcW.value, grad)
+ /** Given (current accumulated gradient, current loss) and (label,
features)
--- End diff --
Nit: just use `//` for two lines of comment. Really `/**` (vs `/*`) is for
javadoc.
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