Add upsample_nearest

[mcabbott]

No description provided.

[maxfreu]

Hi! Does this support GPU?

[mcabbott]

I haven't tried it, but I can't see why it wouldn't.

Edit -- now checked, seems fine!

[maxfreu]

Ok, sounds promising :D

I suggest that you remove all changes regarding bilinear upsampling and move them to #266. That way we dont mix our PRs.

[mcabbott]

I will remove the upsample_x(::Array, ::Int) methods, I think, as there is no need for NNlib to be too strongly attached to what the last two dimensions mean. done.

If #266 is going to be done soon, perhaps it's easiest to fix up these doc changes after that. (I know it's poor style to mix things slightly, but I'm no good at juggling too many branches locally...) Reverted for now.

[maxfreu]

Looks neat now! :)

but I'm no good at juggling too many branches locally.

And I'm not good at merging intertwined stuff, that's why I asked 🤣