Hint users DeepEP normal mode is incompatible with CUDA Graph (sgl-project#5014)

Author: fzyzcjy

python/sglang/srt/server_args.py

@@ -323,6 +323,9 @@ def __post_init__(self):
                 assert (
                     not self.enable_dp_attention
                 ), "DeepEP MoE `auto` mode is not supported with DP Attention."
+            if self.deepep_mode == "normal":
+                logger.warning("Cuda graph is disabled because deepep_mode=`normal`")
+                self.disable_cuda_graph = True
             self.ep_size = self.tp_size
             self.enable_sp_layernorm = (
                 self.dp_size < self.tp_size if self.enable_dp_attention else True