srowen commented on issue #26322: [SPARK-29656][ML][PYSPARK] ML algs expose aggregationDepth URL: https://github.com/apache/spark/pull/26322#issuecomment-548452422 Hm, I am really not sure users can meaningfully tune this, so I'm not sure about adding so much complexity for it. In some cases I think we use reduce vs treeReduce on purpose as it can be faster; it really depends on the usage.
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