[DSV4][XPU] Add MHC fused_post_pre support#44144
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- Add forward_xpu to MHCFusedPostPreOp (decomposes into mhc_post_torch + mhc_pre_torch) - Update XPU model forward to use fused MHC path (matching AMD pattern): first layer uses standalone hc_pre, middle layers use mhc_fused_post_pre - Add explicit hc_post after decoder loop Signed-off-by: Ma Jian <jian1.ma@intel.com>
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Summary
Add
MHCFusedPostPreOpXPU support for DeepSeek-V4 on Intel XPU, enabling the fused MHC post+pre path in the decoder loop (matching the AMD/CUDA pattern).Changes
vllm/model_executor/layers/mhc.py: Implementforward_nativeforMHCFusedPostPreOp(decomposes intomhc_post_torch+mhc_pre_torch); addforward_xpudelegating toforward_native.vllm/models/deepseek_v4/xpu/model.py: Update decoder loop to use fused MHC path (first layer → standalonehc_pre, middle layers →mhc_fused_post_pre, explicithc_postafter loop). Add weight loading guards for truncated model testing.Dependencies