Update app.py

app.py

@@ -28,7 +28,7 @@ def write_elo_ratings(elo_ratings):
 
 # Function to get bot response
 def format_chatml_prompt(state):
-    chatml_prompt = ""
+    chatml_prompt = "<s>"
     for message in state["history"]:
         chatml_prompt += message['role']+": "+ message['content']+"\n"
     return chatml_prompt+"Assistant:"