Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/15413 As far as keeping the code around, I much prefer either the current approach (separate code) or having spark.mllib call into spark.ml. That will make it easier to deprecate and eventually remove spark.mllib code in 3.0. I like the upper-triangular matrix packing and unpacking! Could you please add a unit test for it?
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