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[RL] fix update weight for FusedMoE with EP (#8676)

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This commit is contained in:
Zilin Zhu
2025-08-04 01:20:39 +08:00
committed by GitHub
parent 00da906584
commit 3435a24e81
1 changed files with 11 additions and 3 deletions
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14
python/sglang/srt/layers/moe/fused_moe_triton/layer.py
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@@ -124,15 +124,18 @@ class FusedMoE(torch.nn.Module):
if self.moe_ep_size > 1:
# TODO(ch-wan): support shared experts fusion
# Create a tensor of size num_experts filled with -1
self.expert_map_cpu = torch.full((self.num_experts,), -1, dtype=torch.int32)
self.expert_map_cpu = torch.full(
(self.num_experts,), -1, dtype=torch.int32, device="cpu"
)
self.expert_map_cpu = torch.full(
(self.num_experts,), -1, dtype=torch.int32, device="cpu"
)
# Create a expert map for the local experts
self.expert_map_cpu[
self.moe_ep_rank
* self.num_local_experts : (self.moe_ep_rank + 1)
* self.num_local_experts
] = torch.arange(0, self.num_local_experts, dtype=torch.int32, device="cpu")
if not self.enable_flashinfer_cutlass_moe:
self.expert_map_gpu = self.expert_map_cpu.to(device="cuda")
self.routed_scaling_factor = routed_scaling_factor
assert intermediate_size % self.moe_tp_size == 0
@@ -624,6 +627,11 @@ class FusedMoE(torch.nn.Module):
def forward(self, hidden_states: torch.Tensor, topk_output: StandardTopKOutput):
assert self.quant_method is not None
if self.moe_ep_size > 1 and not self.enable_flashinfer_cutlass_moe:
if self.expert_map_cpu is not None and self.expert_map_gpu is None:
# If we are in EP mode, we need to move the expert map to GPU.
self.expert_map_gpu = self.expert_map_cpu.to(device="cuda")
if self.expert_map_gpu is not None:
topk_output = topk_output._replace(
topk_ids=self.expert_map_gpu[topk_output.topk_ids]