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[Bugfix][Platform] Check whether selected backend is None in get_attn_backend_cls() #12975

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Merged
merged 2 commits into from
Feb 10, 2025
Merged

[Bugfix][Platform] Check whether selected backend is None in get_attn_backend_cls() #12975

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d0e4558
[Bugfix][Platform] Check whether selected backend is None in get_attn…
terrytangyuan Feb 9, 2025
8085bdd
Fix pre-commit check
terrytangyuan Feb 9, 2025
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2 changes: 1 addition & 1 deletion vllm/platforms/cpu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ def get_attn_backend_cls(cls, selected_backend: _Backend, head_size: int,
dtype: torch.dtype, kv_cache_dtype: Optional[str],
block_size: int, use_v1: bool,
use_mla: bool) -> str:
if selected_backend != _Backend.TORCH_SDPA:
if selected_backend and selected_backend != _Backend.TORCH_SDPA:
logger.info("Cannot use %s backend on CPU.", selected_backend)
logger.info("Using Torch SDPA backend.")
return "vllm.attention.backends.torch_sdpa.TorchSDPABackend"
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