Github user mpjlu commented on the issue:
https://github.com/apache/spark/pull/18832
parentStats is used in this
code:ãbinAggregates.getParentImpurityCalculator(), this is used in all
iteration.
So that comment seems very misleading.
`} else if (binAggregates.metadata.isUnordered(featureIndex)) {
// Unordered categorical feature
val leftChildOffset =
binAggregates.getFeatureOffset(featureIndexIdx)
val (bestFeatureSplitIndex, bestFeatureGainStats) =
Range(0, numSplits).map { splitIndex =>
val leftChildStats =
binAggregates.getImpurityCalculator(leftChildOffset, splitIndex)
val rightChildStats =
binAggregates.getParentImpurityCalculator()
.subtract(leftChildStats)
gainAndImpurityStats =
calculateImpurityStats(gainAndImpurityStats,
leftChildStats, rightChildStats, binAggregates.metadata)
(splitIndex, gainAndImpurityStats)
}.maxBy(_._2.gain)
(splits(featureIndex)(bestFeatureSplitIndex),
bestFeatureGainStats)
}`
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