Github user WeichenXu123 commented on a diff in the pull request:
    --- Diff: 
    @@ -1722,25 +1723,22 @@ private class LogisticAggregator(
         var maxMargin = Double.NegativeInfinity
         val margins = new Array[Double](numClasses)
    +    val featureStdArray = new Array[Double](features.size)
    --- End diff --
    I suggest change the `featureStdArray` as Aggregator class member, so that 
avoid each update allocate a new temporary array.

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