Xiangrui Meng created SPARK-3086:
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Summary: Use 1-indexing for decision tree nodes
Key: SPARK-3086
URL: https://issues.apache.org/jira/browse/SPARK-3086
Project: Spark
Issue Type: Improvement
Components: MLlib
Reporter: Xiangrui Meng
Priority: Minor
1-indexing is good for binary trees. The root node gets index 1. And for any
node with index i, its left child is (i << 1), right child is (i << 1) + 1,
parent is (i >> 1), and its level is `java.lang.Integer.highestOneBit(idx)`
(also 1-indexing for levels).
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