Allow download of specific variants

[emilio-berti]

I am trying to download several variants of one model, e.g. r1i1p1f1 and r2i1p1f1. I cannot find documentation on how to do it and tried several keywords in the dictionary of the request, but failed. Is this feature implemented?

A additional dictionary key variant could be useful to download specific variants, e.g.

{
  ...,
  'variant': ['r1i1p1f1', 'r2i1p1f1']
}