[fix] fix determine_n_share_experts_fusion (sgl-project#6118)

Author: Alcanderian

python/sglang/srt/models/deepseek_v2.py

@@ -1486,22 +1486,24 @@ def determine_n_share_experts_fusion(
         if self.n_share_experts_fusion > 0:
             # Only Deepseek V3/R1 can use shared experts fusion optimization now.
             if (
-                self.config.architectures[0] != architecture
+                not _is_cuda
+                or self.config.architectures[0] != architecture
                 or self.config.n_routed_experts != 256
             ):
                 self.n_share_experts_fusion = 0
                 global_server_args_dict["n_share_experts_fusion"] = 0
                 log_info_on_rank0(
                     logger,
-                    "Only Deepseek V3/R1 can use shared experts fusion optimization. Shared experts fusion optimization is disabled.",
+                    "Only Deepseek V3/R1 on NV-platform can use shared experts fusion optimization. Shared experts fusion optimization is disabled.",
                 )
             else:
                 assert (
                     self.n_share_experts_fusion == self.tp_size
                 ), f"Shared experts fusion optimization is enabled in DeepSeek V3/R1, set it to {self.tp_size} can get best optimized performace."
         elif self.n_share_experts_fusion == 0:
             if (
-                torch.cuda.get_device_capability("cuda") >= (9, 0)
+                _is_cuda
+                and torch.cuda.get_device_capability("cuda") >= (9, 0)
                 and self.config.architectures[0] == architecture
                 and self.config.n_routed_experts == 256
                 and (not global_server_args_dict["enable_deepep_moe"])