srowen commented on issue #27546: [SPARK-30773][ML]Support NativeBlas for level-1 routines URL: https://github.com/apache/spark/pull/27546#issuecomment-587035245 Yeah, the problem is that it could be a win in some cases, but harmful in others. It depends on what real-world Spark usage is like, and many of these ops are used for small arrays in general. It would be more persuasive to find what actual Spark usages benefit, and when, and by how much, from this change. It's possible some more targeted replacements seem to help much more than they may hurt.
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