Update app.py

app.py

@@ -2,12 +2,9 @@
 import streamlit as st
 
 
-from langchain.chat_models import ChatOpenAI
-from langchain.schema import (
-    AIMessage,
-    HumanMessage,
-    SystemMessage
-)
+from langchian import HuggingFaceHub
+
+llm=HuggingFaceHub(repo_id="google/flan-t5-large")
 
 # From here down is all the StreamLit UI.
 st.set_page_config(page_title="LangChain Demo", page_icon=":robot:")
@@ -38,7 +35,7 @@ def get_text():
     return input_text
 
 
-chat = ChatOpenAI(temperature=0)
+