fix rm server

Former-commit-id: 81bc1638682a9fd01518f9f25250a6b584d2a9e6

src/llmtuner/model/utils.py

@@ -27,7 +27,7 @@ def dispatch_model(model: "PreTrainedModel") -> "PreTrainedModel":
         from accelerate import dispatch_model
         from accelerate.utils import infer_auto_device_map, get_balanced_memory
 
-        if model._no_split_modules is None:
+        if getattr(model, "_no_split_modules", None) is None:
             raise ValueError("The model class needs to implement the `_no_split_modules` attribute.")
 
         kwargs = {"dtype": model.dtype, "no_split_module_classes": model._get_no_split_modules("auto")}