Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1975#discussion_r16322156
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -80,14 +82,12 @@ class DecisionTree (private val strategy: Strategy)
extends Serializable with Lo
val maxDepth = strategy.maxDepth
// the max number of nodes possible given the depth of the tree
val maxNumNodes = math.pow(2, maxDepth + 1).toInt - 1
- // Initialize an array to hold filters applied to points for each node.
- val filters = new Array[List[Filter]](maxNumNodes)
- // The filter at the top node is an empty list.
- filters(0) = List()
// Initialize an array to hold parent impurity calculations for each
node.
val parentImpurities = new Array[Double](maxNumNodes)
// dummy value for top node (updated during first split calculation)
val nodes = new Array[Node](maxNumNodes)
+ val nodesInTree = Array.fill[Boolean](maxNumNodes)(false) // put into
nodes array later?
+ nodesInTree(0) = true
--- End diff --
Is it used anywhere else?
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