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[BugFix] ChunkedLocalAttention is currently not CG compatible #26034

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Merged
merged 1 commit into from
Oct 1, 2025
Merged

[BugFix] ChunkedLocalAttention is currently not CG compatible #26034

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8 changes: 5 additions & 3 deletions vllm/attention/layers/chunked_local_attention.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
import functools
from typing import List, Optional
from typing import ClassVar, List, Optional

import torch

Expand All @@ -12,8 +12,8 @@
from vllm.config import CacheConfig
from vllm.model_executor.layers.quantization import QuantizationConfig
from vllm.v1.attention.backends.utils import (
CommonAttentionMetadata, make_local_attention_virtual_batches,
subclass_attention_backend)
AttentionCGSupport, CommonAttentionMetadata,
make_local_attention_virtual_batches, subclass_attention_backend)

from ..layer import Attention

Expand All @@ -29,6 +29,8 @@ def create_chunked_local_attention_backend(
underlying_builder = underlying_attn_backend.get_builder_cls()

class ChunkedLocalAttentionBuilder(underlying_builder): # type: ignore
cudagraph_support: ClassVar[AttentionCGSupport] = \
AttentionCGSupport.NEVER

def build(self,
common_prefix_len: int,
Expand Down