Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2595#discussion_r18297134
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/impl/DTStatsAggregator.scala
---
@@ -68,90 +93,72 @@ private[tree] abstract class DTStatsAggregator(
* (node, feature, left/right child) offset
from
* [[getLeftRightNodeFeatureOffsets]].
*/
- def getImpurityCalculator(nodeFeatureOffset: Int, binIndex: Int):
ImpurityCalculator = {
- impurityAggregator.getCalculator(allStats, nodeFeatureOffset +
binIndex * statsSize)
+ def getImpurityCalculator(featureOffset: Int, binIndex: Int):
ImpurityCalculator = {
+ impurityAggregator.getCalculator(allStats, featureOffset + binIndex *
statsSize)
}
/**
- * Update the stats for a given (node, feature, bin) for ordered
features, using the given label.
+ * Update the stats for a given (feature, bin) for ordered features,
using the given label.
*/
- def update(
- nodeIndex: Int,
- featureIndex: Int,
- binIndex: Int,
- label: Double,
- instanceWeight: Double): Unit = {
- val i = getNodeFeatureOffset(nodeIndex, featureIndex) + binIndex *
statsSize
+ def update(featureIndex: Int, binIndex: Int, label: Double,
instanceWeight: Double): Unit = {
+ val i = featureOffsets(featureIndex) + binIndex * statsSize
impurityAggregator.update(allStats, i, label, instanceWeight)
}
/**
- * Pre-compute node offset for use with [[nodeUpdate]].
- */
- def getNodeOffset(nodeIndex: Int): Int
-
- /**
* Faster version of [[update]].
- * Update the stats for a given (node, feature, bin) for ordered
features, using the given label.
- * @param nodeOffset Pre-computed node offset from [[getNodeOffset]].
+ * Update the stats for a given (feature, bin), using the given label.
+ * @param nodeFeatureOffset For ordered features, this is a
pre-computed feature offset
+ * from [[getNodeFeatureOffset]].
--- End diff --
Old names in doc: "getNodeFeatureOffset" and
"getLeftRightNodeFeatureOffsets"
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