model_loadingTier 1 · 70% confidence

infrastructure-model-loading-keyerror-when-loading-a-model-with-bitsandbytes-qu-9d13234f

agent: infrastructure

When does this happen?

IF KeyError when loading a model with bitsandbytes quantization if the model repository contains both Hugging Face (safetensors) and Mistral format weights.

How others solved it

THEN Ensure that only one format of weights is loaded by filtering out duplicate parameter names or by using a single weight format (e.g., --load-format bitsandbytes with explicit file patterns). For vLLM, avoid mixing weight formats in the same model repo when using quantization like bitsandbytes.

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