Fix tie_word_embeddings for multimodal models in Transformers v5#33359
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hmellor merged 2 commits intovllm-project:mainfrom Jan 30, 2026
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Fix tie_word_embeddings for multimodal models in Transformers v5#33359hmellor merged 2 commits intovllm-project:mainfrom
tie_word_embeddings for multimodal models in Transformers v5#33359hmellor merged 2 commits intovllm-project:mainfrom
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Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
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This pull request correctly addresses an issue with tie_word_embeddings for multimodal models in Transformers v5 by propagating the setting from the main model config to the text-specific config. I've added one high-severity comment to improve the robustness of the implementation and prevent a potential AttributeError for certain multimodal models.
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LGTM, thanks for the work!
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In Transformers v5,
tie_word_embeddingsbelongs to the config of the class that can see both layers to be tied. For example:Therefore,
tie_word_embeddingsis defined inSomeVLModelForMultimodalLM's config and is not present inSomeVLModel's config. In vLLM, thelm_headbelongs to thelanguage_model, so we must ensure thattie_word_embeddingsis set in thelanguage_model's config.