[yt-dev] about alternative kernel functions

Nathan Goldbaum nathan12343 at gmail.com
Thu Jul 30 20:21:59 PDT 2015


On Thursday, July 30, 2015, Bili Dong <qobilidop at gmail.com> wrote:

> Hi all,
>
> Currently in yt, only the default cubic spline kernel function is provided
> and used for the smoothing. I’m thinking about adding more kernel
> functions, providing the possibility to choose from them and also the
> possibility for the users to provide their own ones. In my own research, a
> quintic spline kernel is used, for example. So I guess this functionality
> might also be useful for other users.
>
> My current plan goes like this:
> 1. Add several common kernel functions besides the current one.
> 2. Build a naming system.


Maybe these choices could be visible to the user via a field name? We
already let people do that for different local deposition methods (e.g.
("deposit", "all_density") versus ("deposit", "cic_density")).

Perhaps the "default" smoothing kernel used for the 'gas' field type in the
SPH frontend a could be configurable? That way users could use their
preferred smoothing either by using the appropriate detailed field name
("PartType0_quintic_smoothed_density", just as an for example) or by using
plain old ("gas", "density"), but relying on the rc configuration option to
control the smoothing kernel.


> 3. Put a kwarg in appropriate places to pass the name of the kernel
> function. For now, I’m thinking about put it in the ParticleSmoothOperation
> class as a parameter of __init__.
> 4. Reserve a special kwarg value which can be used to pass the
> user-provided kernel functions.
>
> I’m not much experienced with yt. So correct me if there are any mistakes
> or omissions! Any suggestions are much appreciated!
>
> Thanks,
> Bili
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