Github user sethah commented on the issue:
https://github.com/apache/spark/pull/17894
@VinceShieh Thanks for posting your results. You tested these on datasets
with only 100 samples correct? That's probably not a representative use case of
a normal workload... Also, how many classes (i.e. `numClasses`) did you use?
I've actually been looking at using level 3 BLAS operations in the logistic
aggregator, and initial results showed close to 10x speedups in some cases. I
am holding off submitting any code because it would require a fairly
significant refactoring of the code, which will be made much easier after
https://github.com/apache/spark/pull/17094 is merged. Using level 2 BLAS is a
less invasive change, but the test results you show provide rather small
speedups.
My preference is to wait a bit and submit a change that incorporates level
3 BLAS in logistic regression. We should get @dbtsai's opinion too.
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