[SciPy-Dev] Hyper-dual numbers

[Evgeni Burovski]

Ah, these. Suspected it, but wanted to make sure.

IMO, these are best implemented as a numpy dtype. I'm biased though
--- here's a branch which makes a start, based on Mike Boyle's version
of quaternion dtype (Mike and other authors, if you're reading this
--- thanks a ton!)

https://github.com/ev-br/quaternion/tree/dual

Now, I don't think scipy should carry around additional numpy dtypes.
Cannot speak for the numpy project, but I strongly suspect this is
best implemented as a separate repository/project.

Cheers,

Evgeni

On Sat, Feb 13, 2021 at 9:46 PM Joseph Fox-Rabinovitz
<jfoxrabinovitz at gmail.com> wrote:
>
> I directed Andrea here from Stack Overflow (https://stackoverflow.com/q/66179855/2988730). Based on the Wikipedia article (https://en.m.wikipedia.org/wiki/Dual_number), it seems like scipy is a much more likely place to look than numpy.
>
> - Joe
>
>
> On Sat, Feb 13, 2021, 13:19 Evgeni Burovski <evgeny.burovskiy at gmail.com> wrote:
>>
>> Hi Andrea, welcome!
>>
>> Since you're asking about numpy, you likely want the numpy-discussion
>> mailing list. (the overlap is non-zero, but nevertheless).
>>
>> Out of curiosity, what's a hyper-dual type?
>>
>> Cheers,
>>
>> Evgeni
>>
>> On Sat, Feb 13, 2021 at 7:45 PM Andrea Cortis <andrea.cortis at gmail.com> wrote:
>> >
>> > Hello, first time here. I was wondering if there are plans for the definition of a “hyper-dual” type in numpy. I think that would be most useful for neural nets training, and  optimization in general.
>> >
>> > Andrea
>> >
>> > Sent from my iPad
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