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Fix PyTorch 2.8 API compatibility for symm_mem.fused_scaled_matmul_reduce_scatter #24393

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Fix PyTorch 2.8 API compatibility for symm_mem.fused_scaled_matmul_reduce_scatter #24393

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Fix PyTorch 2.8 API compatibility for fused_scaled_matmul_reduce_scatter
louiswang524 Sep 7, 2025
7e8c507
Merge branch 'main' into fix-pytorch-28-symm-mem-api
louiswang524 Sep 7, 2025
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18 changes: 12 additions & 6 deletions vllm/compilation/collective_fusion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -162,9 +162,12 @@ def replacement(input: torch.Tensor, mat2: torch.Tensor,
scale_a,
scale_b,
"avg",
scatter_dim=0,
out_dtype=self.dtype,
group_name=self.tp.device_group.group_name,
0, # scatter_dim
self.tp.device_group.group_name, # group_name
None, # bias_node
None, # result_scale_node
self.dtype, # out_dtype
False, # use_fast_accum
)

return gemm_rs
Expand Down Expand Up @@ -274,9 +277,12 @@ def replacement(input: torch.Tensor, mat2: torch.Tensor,
scale_a,
scale_b,
"avg",
scatter_dim=0,
out_dtype=self.dtype,
group_name=self.tp.device_group.group_name,
0, # scatter_dim
self.tp.device_group.group_name, # group_name
None, # bias_node
None, # result_scale_node
self.dtype, # out_dtype
False, # use_fast_accum
)

return gemm_rs
Expand Down