srowen commented on issue #27374: [SPARK-30659][ML][PYSPARK] LogisticRegression blockify input vectors URL: https://github.com/apache/spark/pull/27374#issuecomment-579280774 Also, does this cause any appreciable slowdown at smaller scale? it's not a big deal if something that's fast is a little slower, to make things that are slow much faster, but just want to get a sense of what you know about the scale implications.
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