Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/3899#discussion_r22549295
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/optimization/Gradient.scala ---
@@ -64,11 +64,17 @@ class LogisticGradient extends Gradient {
val gradientMultiplier = (1.0 / (1.0 + math.exp(margin))) - label
val gradient = data.copy
scal(gradientMultiplier, gradient)
+ val minusYP = label * margin
--- End diff --
This looks like you expect labels to be -1, +1. They are actually 0, 1.
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