🚀 Feature

Support torch.linalg.outer.

cc @jianyuh @nikitaved @pearu @mruberry @heitorschueroff @walterddr @IvanYashchuk @xwang233 @lezcano @rgommers @pmeier @asmeurer @leofang @AnirudhDagar @asi1024 @emcastillo @kmaehashi

Motivation & Pitch

Python Array API proposes the use of linalg.outer among other linear algebra functions. Currently, PyTorch supports the same functionality with torch.outer. torch.ger (to be deprecated in 1.10) is also an alias to torch.outer at the moment.

We can either make torch.linalg.outer the main function with torch.outer and torch.ger as aliases to that. Or we can keep torch.outer as is and just alias torch.linalg.outer to that.

The only difference is that Array API doesn't define a keyword-only out= argument which should be fine since PyTorch's API will just be a superset of Array API here.

Additional context

• Python Array API linalg.outer