fix(mm): flux model variant probing #7825
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In #7780 we added FLUX Fill support, and needed the probe to be able to distinguish between "normal" FLUX models and FLUX Fill models. Logic was added to the probe to check a particular state dict key (input channels), which should be 384 for FLUX Fill and 64 for other FLUX models. The new logic was stricter and instead of falling back on the "normal" variant, it raised when an unexpected value for input channels was detected. This caused failures to probe for BNB-NF4 quantized FLUX Dev/Schnell, which apparently only have 1 input channel. After checking a variety of FLUX models, I loosened the strictness of the variant probing logic to only special-case the new FLUX Fill model, and otherwise fall back to returning the "normal" variant. This better matches the old behaviour and fixes the import errors. Closes #7822
psychedelicious
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Mar 24, 2025
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Summary
In #7780 we added FLUX Fill support, and needed the probe to be able to distinguish between "normal" FLUX models and FLUX Fill models.
Logic was added to the probe to check a particular state dict key (input channels), which should be 384 for FLUX Fill and 64 for other FLUX models.
The new logic was stricter and instead of falling back on the "normal" variant, it raised when an unexpected value for input channels was detected.
This caused failures to probe for BNB-NF4 quantized FLUX Dev/Schnell, which apparently only have 1 input channel.
After checking a variety of FLUX models, I loosened the strictness of the variant probing logic to only special-case the new FLUX Fill model, and otherwise fall back to returning the "normal" variant. This better matches the old behaviour and fixes the import errors.
Related Issues / Discussions
Closes #7822
QA Instructions
Try importing quantized FLUX models. I tested and it works as it should.
Merge Plan
n/a
Checklist
What's Newcopy (if doing a release after this PR)