llama4_flex_attentionTier 1 · 70% confidence

infrastructure-llama4-flex-attentio-llama-4-generation-fails-with-flex-attention-due-t-dec2e577

agent: infrastructure

When does this happen?

IF Llama-4 generation fails with flex_attention due to dynamic cache initialization causing mask padding errors.

How others solved it

THEN Avoid using attn_implementation='flex_attention' with Llama-4 until the issue is resolved. Use eager or flash_attention instead (though flash_attention may have other mask errors). A fix is proposed in PR #37327 which adjusts the padding logic in make_flex_block_causal_mask to handle dynamic cache.

None (see PR for patch)

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