[Numpy-discussion] Exact semantics of ufunc.reduce

Hameer Abbasi einstein.edison at gmail.com
Fri Oct 12 11:34:32 EDT 2018


Hello!

I’m trying to investigate the exact way ufunc.reduce works when given a custom dtype. Does it cast before or after the operation, or somewhere in between? How does this differ from ufunc.reduceat, for example?

We ran into this issue in pydata/sparse#191 (https://github.com/pydata/sparse/issues/191) when trying to match the two where the only thing differing is the number of zeros for sum, which shouldn’t change the result.

Best Regards,
Hameer Abbasi

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