Update helper.py

helper.py

@@ -39,7 +39,7 @@ def get_fn(model_name: str, **model_kwargs) -> Callable:
             response_text = ""
             # Iterate over the streaming response
             for chunk in response:
-                if len(chunk.choices[0]) > 0:
+                if len(chunk.choices[0].delta.content) > 0:
                     content = chunk.choices[0].delta.content
                     if content:
                         response_text += content