fix(diffusers): forward original config for single files - #11227
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Assisted-by: Codex:gpt-5
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Expose original_config_file through the model configuration metadata registry so registry completeness checks and generated configuration surfaces stay in sync. Assisted-by: Codex:gpt-5 [systematic-debugging]
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Description
Closes #3250.
Adds a typed
diffusers.original_config_filemodel setting and forwards it to Diffusers only when loading a single-file checkpoint. Directory and Hubfrom_pretrainedloads keep their existing arguments, and an unset value remains backward-compatible.The load-argument decision lives in a dependency-free helper so it can be tested without installing the full Diffusers runtime. The model configuration reference and image-generation guide now document the field and include an offline single-file example.
Notes for Reviewers
The new proto3
ModelOptions.OriginalConfigFileuses field number 76. Core does not validate or rewrite the configured path because it is interpreted in the backend worker filesystem/URL context.Verification:
make protogen-gogo test ./core/backendpython3 -m unittest backend/python/diffusers/test_load_options.pypython3 -m py_compile backend/python/diffusers/backend.pySigned commits