[Bugfix] Fix CUDA import on non-CUDA platforms (#31919)

python/sglang/srt/model_executor/model_runner.py

@@ -78,7 +78,6 @@ from sglang.srt.layers.cp.utils import (
     get_cp_strategy,
 )
 from sglang.srt.layers.logits_processor import LogitsProcessorOutput
-from sglang.srt.layers.moe.dwdp import DwdpManager
 from sglang.srt.layers.sampler import create_sampler
 from sglang.srt.layers.torchao_utils import apply_torchao_config_to_model
 from sglang.srt.layers.utils.cp_utils import is_mla_prefill_cp_enabled
@@ -1027,6 +1026,8 @@ class ModelRunner:
             return
         if self.server_args.dwdp_size <= 1:
             return
+        from sglang.srt.layers.moe.dwdp import DwdpManager
+
         manager = DwdpManager(self.server_args)
         set_global_dwdp_manager(manager)
         manager.setup(self.model)