Fix: raise error for non mixed type model

deepmd/dpmodel/atomic_model/linear_atomic_model.py

@@ -54,6 +54,15 @@ def __init__(
     ):
         super().__init__(type_map, **kwargs)
         super().init_out_stat()
+
+        # check all sub models are of mixed type.
+        model_mixed_type = []
+        for m in models:
+            if not m.mixed_types():
+                model_mixed_type.append(m)
+        if len(model_mixed_type) > 0:
+            raise ValueError(f"LinearAtomicModel only supports AtomicModel of mixed type, the following models are not mixed type: {err_msg}.")
+
         self.models = models
         sub_model_type_maps = [md.get_type_map() for md in models]
         err_msg = []

deepmd/pt/model/atomic_model/linear_atomic_model.py

@@ -61,6 +61,15 @@ def __init__(
     ):
         super().__init__(type_map, **kwargs)
         super().init_out_stat()
+
+        # check all sub models are of mixed type.
+        model_mixed_type = []
+        for m in models:
+            if not m.mixed_types():
+                model_mixed_type.append(m)
+        if len(model_mixed_type) > 0:
+            raise ValueError(f"LinearAtomicModel only supports AtomicModel of mixed type, the following models are not mixed type: {err_msg}.")
+
         self.models = torch.nn.ModuleList(models)
         sub_model_type_maps = [md.get_type_map() for md in models]
         err_msg = []