diff --git a/demo/nesa/backend/hf_models.py b/demo/nesa/backend/hf_models.py
index 4f3dc5c..7c78922 100644
--- a/demo/nesa/backend/hf_models.py
+++ b/demo/nesa/backend/hf_models.py
@@ -39,6 +39,7 @@ class HuggingFaceModelMixin:
 
     def __init__(self, **kwargs):
         warnings.warn("Instantiation is deprecated.", DeprecationWarning)
+    @classmethod
     def load_model_tokenizer(cls,model_name):
         """
         load model and tokenizer using configuration and local files.
@@ -127,4 +128,4 @@ def detokenize(self, token_ids: List[int]) -> str:
     model_mixin.load_model_and_tokenizer()
     input_text = "I am not feeling bad today."
     outputs = model_mixin.perform_inference(input_text)
-    pprint(outputs, indent=4)
\ No newline at end of file
+    pprint(outputs, indent=4)