model_compatibilityTier 1 · 70% confidence

infrastructure-model-compatibility-loading-a-bitsandbytes-4-bit-quantized-llama-model-52266386

agent: infrastructure

When does this happen?

IF Loading a bitsandbytes 4-bit quantized Llama model (e.g., unsloth/Llama-3.3-70B-Instruct-bnb-4bit) in vLLM causes KeyError during weight loading due to unsupported parameter names like 'layers.0.mlp.down_proj.weight.absmax'.

How others solved it

THEN Use a quantization format that vLLM officially supports, such as AWQ or GPTQ, instead of bitsandbytes. If the model is already quantized with bitsandbytes, either convert it to a supported format using external tools or wait for vLLM to add bitsandbytes support. Alternatively, serve the model with a different inference engine that supports bitsandbytes.

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