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[Misc] Allow passing logits_soft_cap for xformers backend #11252

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merged 1 commit into from
Dec 17, 2024
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[Misc] Allow passing logits_soft_cap for xformers backend #11252

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8 changes: 3 additions & 5 deletions vllm/attention/backends/xformers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,7 @@
is_all_cross_attn_metadata_set, is_all_encoder_attn_metadata_set)
from vllm.attention.ops.paged_attn import (PagedAttention,
PagedAttentionMetadata)
from vllm.logger import init_logger

logger = init_logger(__name__)
from vllm.utils import print_warning_once


class XFormersBackend(AttentionBackend):
Expand Down Expand Up @@ -386,8 +384,8 @@ def __init__(
raise ValueError(
"XFormers does not support block-sparse attention.")
if logits_soft_cap is not None:
raise ValueError(
"XFormers does not support attention logits soft capping.")
print_warning_once("XFormers does not support logits soft cap. "
"Outputs may be slightly off.")
self.num_heads = num_heads
self.head_size = head_size
self.scale = float(scale)
Expand Down
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