Update helper.py

helper.py

@@ -33,7 +33,7 @@ def get_fn(model_name: str, **model_kwargs) -> Callable:
                 top_p=top_p,
                 stream=True, 
                 # Ensure response_format is set correctly; typically it's a string like 'text'
-                response_format="text",
+                response_format={"type": "text"},
             )
 
             response_text = ""