Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1673#discussion_r15628533
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala
---
@@ -91,4 +91,59 @@ class Node (
}
}
}
+
+ /**
+ * Get number of nodes in tree from this node, including leaf nodes.
+ */
+ def numNodesRecursive: Int = {
+ if (isLeaf) {
+ 1
+ } else {
+ 1 + leftNode.get.numNodesRecursive + rightNode.get.numNodesRecursive
+ }
+ }
+
+ /**
+ * Get depth of tree from this node.
+ * E.g.: Depth 0 means this is a leaf node.
+ */
+ def depthRecursive: Int = {
+ if (isLeaf) {
+ 0
+ } else {
+ 1 + math.max(leftNode.get.depthRecursive,
rightNode.get.depthRecursive)
+ }
+ }
+
+ /**
+ * Recursive print function.
+ * @param indentFactor The number of spaces to add to each level of
indentation.
+ */
+ def toStringRecursive(indentFactor: Int = 0): String = {
+
+ def splitToString(split: Split, left: Boolean) : String = {
+ split.featureType match {
+ case Continuous => if (left) {
+ s"(feature ${split.feature} <= ${split.threshold})"
+ } else {
+ s"(feature ${split.feature} > ${split.threshold})"
+ }
+ case Categorical => if (left) {
+ s"(feature ${split.feature} in ${split.categories})"
--- End diff --
The string may contain `List(...)`, which can be removed by calling
`split.categories.mkString("{",",","}")`.
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