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Commit 4ee79c71 authored by Xiangrui Meng's avatar Xiangrui Meng
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[SPARK-5430] move treeReduce and treeAggregate from mllib to core

We have seen many use cases of `treeAggregate`/`treeReduce` outside the ML domain. Maybe it is time to move them to Core. pwendell

Author: Xiangrui Meng <meng@databricks.com>

Closes #4228 from mengxr/SPARK-5430 and squashes the following commits:

20ad40d [Xiangrui Meng] exclude tree* from mima
e89a43e [Xiangrui Meng] fix compile and update java doc
3ae1a4b [Xiangrui Meng] add treeReduce/treeAggregate to Python
6f948c5 [Xiangrui Meng] add treeReduce/treeAggregate to JavaRDDLike
d600b6c [Xiangrui Meng] move treeReduce and treeAggregate to core
parent e80dc1c5
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