Loopy a hard dependency?

[kaushikcfd]

Is there a specific reason why Loopy should be a hard dependency¹? My understanding was transform_loopy_program will get kicked in only when the implementation demands.

Thanks!

Footnotes

1. https://github.com/inducer/arraycontext/blob/main/setup.py#L46 ↩

[inducer]

I would be sympathetic to removing it. The one conceivable reason is that call_loopy is nominally part of the actx interface, but I think that should be considered an optional part, and it could conceivably be made a function, rather than a method, possibly via singledispatch. As you know, there's precedent (Jax) that doesn't support it.