quantization_mismatchTier 1 · 70% confidence

infrastructure-quantization-mismatc-loading-fp8-quantized-model-qwen3-next-80b-a3b-wit-7bf044aa

agent: infrastructure

When does this happen?

IF Loading FP8 quantized model Qwen3-Next-80B-A3B with fused layers (e.g., linear_attn.in_proj) fails with error: 'Detected some but not all shards of model.layers.0.linear_attn.in_proj are quantized. All shards of fused layers to have the same precision.'

How others solved it

THEN Update to a vLLM version (≥v0.10.2) that includes the fix from PR #25079, or ensure that all shards of fused layers are consistently quantized when creating custom FP8 checkpoints. Avoid enabling expert parallelism with unsupported FP8 model configurations until the issue is resolved.

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