Update app.py

app.py

@@ -54,7 +54,7 @@ def respond(
 
     # Stream response tokens from the chat completion API
     for message_chunk in client.chat_completion(
-        model = "google/gemma-2b-it"
+        model = "google/gemma-2b-it",
         messages=messages,
         max_tokens=max_tokens,
         stream=True,