Missing decomp for ops.aten.linalg_vector_norm

[guangy10]

🐛 Describe the bug

This ops is heavily used in many vision transformers models (convnextv2, swiftformer, swinv2), lowering those models to ExecuTorch will fail because this op is neither in core aten opset or having a decomp rule.

We should consider adding a decomp rule for it to unblock

Versions

trunk

cc @jianyuh @nikitaved @pearu @mruberry @walterddr @xwang233 @lezcano @SherlockNoMad

[SS-JIA]

It turns out that there's an existing decomposition under _refs/init.py.

I don't recall the exact purpose of _refs but I don't think it will be easy to change/replace this decomposition. I will put up a PR to add the decomp to the core decomp table, but @guangy10 can you check if the model can export with the existing decomposition?

[SS-JIA]

#150241

[guangy10]

It turns out that there's an existing decomposition under _refs/init.py.

I don't recall the exact purpose of _refs but I don't think it will be easy to change/replace this decomposition. I will put up a PR to add the decomp to the core decomp table, but @guangy10 can you check if the model can export with the existing decomposition?

You mean the default decomposition? No, if I don’t add it to the exclusion list, it will fail.

[SS-JIA]

Ah, I meant double check that the decomposition in _refs/init.py works and the model and export with it. Note that the implementation is more complex than the decomp that Chen provided. Since we are not using that decomp, I want to make sure that the existing decomp is compatible and doesn't cause further issues.

[angelayi]

duplicate of #150061

[metascroy]

@SS-JIA what's the status on this?

[SS-JIA]

@metascroy discussion continued in an internal post, apologies for the lack of visibility. I created a PR to add an existing decomp to the core table but it doesn't pass correctness tests. I will try to manually insert a decomp into the edge decomp list manually, suggested by Tarun. Will give it a shot next week.

[SS-JIA]

For completeness the PR I created is #150241