On Fri, Jun 2, 2023 at 1:51 PM Ronald van Elburg <r.a.j.van.elb...@hetnet.nl> wrote:
> Aha, the unnecessary copy mentioned in the > https://dbs.ifi.uni-heidelberg.de/files/Team/eschubert/publications/SSDBM18-covariance-authorcopy.pdf. > paper is a copy of the input. Here it is about discarding a valuable output > (the mean) and then calculating that result separately. > > Not throwing the mean away saves about 20% computation time. Or phrased > differently the calculation of the variance spends about a 25% of the > computation time on calculating the mean. > I'm not sure I find that a compelling benefit for introducing dedicated functions. The work on moving the implementation to C showed >2x speedups ( https://github.com/numpy/numpy/issues/13199#issuecomment-478305730). Is there a reason for not trying to get that much larger gain merged first or instead? Cheers, Ralf
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