Update app.py

app.py

@@ -80,6 +80,8 @@ if "metrics" not in st.session_state:
     st.session_state.metrics = {}
 if "query_dataset" not in st.session_state:
     st.session_state.query_dataset = ''
+if "rmse" not in st.session_state:
+    st.session_state.rmse = {}
 
 recent_questions = load_recent_questions()