torch.chunk returns Tuple, not List

[Daniel-Chin]

📚 The doc issue

Both

• the documentation at https://pytorch.org/docs/stable/generated/torch.chunk.html as of V2.3 and
• the type annotation in line 736 of torch/_C/_VariableFunctions.pyi

claim that the return type of torch.chunk is List[Tensor], whereas in reality it is Tuple[Tensor] according to

• The "Example" section on that exact documentation page and
• local testing with pytorch 2.1.0.

Suggest a potential alternative/fix

Fix the doc and the annotations.

cc @ezyang @malfet @xuzhao9 @gramster

[cpuhrsch]

Marked for triage review to discuss what we want to do here

[drisspg]

Although the the typed named is a tensorlist in return values for this type are always tuples in python. This is actionable and we want to update the signature in pyi to reflect that this always returns a tuple