transformers

e7f3c4f0 - Honor a concrete dtype in AutoModel for composite checkpoints (#46514)

Honor a concrete dtype in AutoModel for composite checkpoints (#46514) * Honor a concrete dtype in AutoModel for composite checkpoints AutoModelForCausalLM.from_pretrained(..., dtype=X) silently ignored a concrete dtype X for composite/multimodal checkpoints (e.g. Qwen3.5). Only dtype="auto" was popped before building the config, so a concrete value was absorbed onto the composite config by AutoConfig and dropped when the factory swapped to the text sub-config, leaving the model on the saved dtype. Pop a concrete dtype before building the config and re-inject it afterwards, mirroring the adjacent quantization_config handling. The saved dtype is kept by default and overridden only when a dtype is passed. Add test_automodelforcausallm_dtype to the Qwen3.5 and Qwen3.5-MoE testers. * Assert the VLM's weights, not just its config, load in the requested dtype * Keep the user-provided dtype on the composite config for BC and drop the redundant default-dtype guard in tests * Keep the resolved dtype on the top-level config in `_from_config` For leaf configs without sub-configs, `_from_config` built the weights in the requested dtype but left `config.dtype` stale (None), so weights and config disagreed. Set it on the top-level config too, matching `from_pretrained`. Fixes #46512 --------- Co-authored-by: Raushan Turganbay <raushan@huggingface.co>