resize_token_embeddings does not effect to output_embeddings

[KoichiYasuoka]

What does this PR do?

Fixes #45292 (seems to come from #41580)

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• text models: @ArthurZucker @Cyrilvallez

[KoichiYasuoka]

"download and unzip hub cache" all failed... How do I do @ArthurZucker?

[Rocketknight1]

cc @ArthurZucker this does seem like a real regression after #41580 when we resize the vocab on models with a tied LM head.

[KoichiYasuoka]

Thank you @Rocketknight1, this bug occurs in transformers==5.0.0rc0 but not in 4.57.6:

• Quick reproduce

from transformers import AutoModelForMaskedLM
mdl = AutoModelForMaskedLM.from_pretrained("google-bert/bert-base-uncased")
e = mdl.get_input_embeddings()
g = mdl.get_output_embeddings()
print(e.num_embeddings, g.out_features)
assert e.num_embeddings == g.out_features
e = mdl.resize_token_embeddings(e.num_embeddings + 1)
g = mdl.get_output_embeddings()
print(e.num_embeddings, g.out_features)
assert e.num_embeddings == g.out_features

[KoichiYasuoka]

Then how do I do @Rocketknight1 and @ArthurZucker ?

[github-actions]

View the CircleCI Test Summary for this PR:

https://huggingface.co/spaces/transformers-community/circle-ci-viz?pr=45311&sha=345ee0

[JLiu4Coding]

Hi Koichi, how is the status of this issue? I have also reproduced this issue and already fixed. I can submit a PR if needed.

[KoichiYasuoka]

Thank you @JLiu4Coding. It seems that https://github.com/huggingface/transformers/pull/45324/changes#diff-6b72b98c4c2dcfc6cc606843917733f5d858374fbc22a735ff483bbc0c1e63ea has fixed this bug #45292. I will close this PR after I confirm #45324 released in v5.5.5 or after.

[Rocketknight1]

Thank you @KoichiYasuoka, and sorry for the delays! It does seem like this bug got fixed, so you can close it whenever you're happy.