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[Bugfix] Derive head_dim for Qwen3 paged attention path #232

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Merged
LxYuan0420 merged 1 commit into from
Apr 6, 2026
Merged

[Bugfix] Derive head_dim for Qwen3 paged attention path #232

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2 changes: 1 addition & 1 deletion vllm_metal/metal_kernel_backend/attention_sdpa.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ def sdpa_forward(
# split into queries (for attention) + gate (applied after attention).
q_proj_out = inner.q_proj(x)
gate = None
head_dim = inner.head_dim
head_dim = inner.k_proj.weight.shape[0] // n_kv_heads
q_full_head = q_proj_out.shape[-1] // n_heads
if q_full_head == 2 * head_dim:
# Gated: split into queries + gate
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