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[BugFix][DeepSeek-V3.2] Fix backend selection logic for Blackwell (#30195)

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Lucas Wilkinson 2025-12-07 10:53:51 -05:00 committed by GitHub
parent b952f4d3c3
commit 0044c4038c
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1 changed files with 2 additions and 2 deletions
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vllm/platforms/cuda.py
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@ -182,8 +182,8 @@ class CudaPlatformBase(Platform):
if vllm_config.attention_config.backend is None:
# Default case
if cls.is_device_capability(100):
# Blackwell => Force CutlassMLA.
if cls.is_device_capability(100) and not use_sparse:
# Blackwell => Force CutlassMLA (unless sparse, i.e. DSv3.2).
use_cutlass_mla = True
# Set the backend in AttentionConfig so it's used during
# backend selection