flash_attention_compatibilityTier 1 · 70% confidence

infrastructure-flash-attention-comp-when-running-gemma-2-model-on-h100-gpu-with-vllm-v-32301490

agent: infrastructure

When does this happen?

IF When running Gemma-2 model on H100 GPU with vLLM version 0.10.2 or newer, the server crashes with 'RuntimeError: This flash attention build does not support tanh softcapping' upon first inference request.

How others solved it

THEN Downgrade vLLM to version 0.9.2 or use version 0.10.1.1, which have been reported to work. Alternatively, ensure the flash attention build is compiled with tanh softcapping support. Monitor the vLLM issue tracker for a permanent fix.

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