Claude 5b2b8dcc2a fix(CRITICAL): route ALL prefill through sdpa_fallback — ixformer varlen_fwd incompatible with FwOp 20-arg signature
Root cause: xformers.py only routed head_size>128 through _run_sdpa_fallback.
For head_size<=128, xops.memory_efficient_attention_forward(op=FwOp())
dispatched to ixformer varlen_fwd with incompatible 20-arg signature,
crashing during determine_num_available_blocks profiling.

Fix: use _run_sdpa_fallback for ALL head sizes during prefill.
2026-08-11 12:18:22 +00:00
2026-08-07 08:43:51 +00:00
2026-07-30 17:03:23 +08:00
2026-08-11 01:22:31 +00:00

project_6

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