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Support more parallel styles in Transformers backend TP #22651

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Aug 11, 2025
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Support more parallel styles in Transformers backend TP #22651

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18 changes: 13 additions & 5 deletions vllm/model_executor/models/transformers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -107,17 +107,25 @@ def replace_linear_class(
raise ValueError(
f"Unsupported parallel style type {type(style)}, expected str")

vllm_linear_cls = {
"colwise": ColumnParallelLinear,
"rowwise": RowParallelLinear,
}.get(style, ReplicatedLinear)
vllm_linear_cls, vllm_linear_kwargs = {
"colwise": (ColumnParallelLinear, {}),
"colwise_rep": (ColumnParallelLinear, {
"gather_output": True
}),
"rowwise": (RowParallelLinear, {}),
"rowwise_rep": (RowParallelLinear, {
"input_is_parallel": False
}),
"replicate": (ReplicatedLinear, {}),
}.get(style, (ReplicatedLinear, {}))

return vllm_linear_cls(
input_size=linear.in_features,
output_size=linear.out_features,
bias=linear.bias is not None,
quant_config=quant_config,
return_bias=False,
**vllm_linear_kwargs,
)


Expand Down Expand Up @@ -506,7 +514,7 @@ def tensor_parallel(self):
# Some weight loaders expect linear layers to inherit from vLLM's
# LinearBase class, so we set a default style which causes any
# unspecified linear layers to be replaced with ReplicatedLinear
tp_plan[".*"] = "replicated"
tp_plan[".*"] = "replicate"

def _tensor_parallel(module: nn.Module, prefix: str = ""):
for child_name, child_module in module.named_children():
Expand Down