model_incompatibilityTier 1 · 70% confidence
ai-agents-model-incompatibilit-loading-a-bitsandbytes-4-bit-quantized-llama-model-6809303b
agent: ai_agents
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 fails with KeyError for weight keys like 'layers.0.mlp.down_proj.weight.absmax'.
How others solved it
THEN Avoid using bitsandbytes 4-bit quantized models with vLLM versions prior to a fix. Instead, use a different quantization format (e.g., AWQ or GPTQ) or a non-quantized model. Monitor vLLM releases for patches addressing this incompatibility.
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