Update app.py

app.py

@@ -22,6 +22,8 @@ def init_openai_settings():
 
 
 def init_session():
+    if not st.session_state.get("params"):
+        st.session_state["params"] = dict()
     if not st.session_state.get("chats"):
         st.session_state["chats"] = {}
 
@@ -76,13 +78,15 @@ def init_sidebar():
         format="%0.2f",
         help="""What sampling temperature to use, between 0 and 2. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic.""",
     )
-    st.session_state["params"]["max_tokens"] = chat_config_expander.number_input(
+    st.session_state["params"]["max_tokens"] = chat_config_expander.slider(
         "MAX_TOKENS",
         value=2000,
         step=1,
+        min_value=100,
         max_value=4000,
         help="The maximum number of tokens to generate in the completion",
     )
+
     st.session_state["params"]["prompt"] = chat_config_expander.text_area(
         "Prompts",
         "You are a helpful assistant that answer questions as possible as you can.",