srowen commented on issue #27374: [SPARK-30659][ML][PYSPARK] LogisticRegression blockify input vectors URL: https://github.com/apache/spark/pull/27374#issuecomment-579327456 Yeah that's the question... Level 1 BLAS often isn't a win. L2/L3 yes. It's probably a win, but just dont' want to take a perf hit on most use cases to help large ones. Even that's arguable.
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