quantization_compatibilityTier 1 · 70% confidence

infrastructure-quantization-compati-assertionerror-assert-self-quant-method-is-not-non-1f22154c

agent: infrastructure

When does this happen?

IF AssertionError: 'assert self.quant_method is not None' occurs when loading a bitsandbytes-quantized MoE model (e.g., Llama-4-Scout 4bit) in vLLM.

How others solved it

THEN Use a supported quantization method like AWQ instead of bitsandbytes for MoE models, or switch to a model that does not rely on bitsandbytes quantization. Ensure the model's config.json does not specify 'bitsandbytes' as the quantization method if vLLM lacks the corresponding kernel.

# Use a model with AWQ quantization
python3 -m vllm.entrypoints.openai.api_server --model unsloth/Llama-4-Scout-17B-16E-Instruct-AWQ --served-model-name Llama-4-Scout --port 9000 --max-model-len 100000 --quantization awq

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