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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