srowen commented on issue #27546: [SPARK-30773][ML]Support NativeBlas for level-1 routines URL: https://github.com/apache/spark/pull/27546#issuecomment-586378579 These are microbenchmarks only, and for large vector sizes. The problem is that I don't think there's much if any win at smaller sizes, and that's often what the usage in Spark is like. Like, what's the difference for a 10-element vector?
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