Github user manishamde commented on a diff in the pull request:
https://github.com/apache/spark/pull/2435#discussion_r18067870
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/impl/DTStatsAggregator.scala
---
@@ -189,7 +170,139 @@ private[tree] class DTStatsAggregator(
}
this
}
+}
+
+/**
+ * DecisionTree statistics aggregator.
+ * This holds a flat array of statistics for a set of (nodes, features,
bins)
+ * and helps with indexing.
+ *
+ * This instance of [[DTStatsAggregator]] is used when not subsampling
features.
+ *
+ * @param numNodes Number of nodes to collect statistics for.
+ */
+private[tree] class DTStatsAggregatorFixedFeatures(
--- End diff --
Could probably be in a separate file. It's hard to locate it otherwise.
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