Update app.py

app.py

@@ -1,7 +1,11 @@
 import os
 import gradio as gr
 from langchain_community.chat_models import ChatOpenAI
-from langchain import LLMChain, PromptTemplate
+from langchain.llms import GPT4All, OpenAI
+from langchain.prompts import PromptTemplate
+from langchain.chains import LLMChain
+from langchain.chains.prompt_selector import ConditionalPromptSelector
+from langchain.memory import ConversationBufferWindowMemory
 from langchain.memory import ConversationBufferMemory
 
 OPENAI_API_KEY=os.getenv('OPENAI_API_KEY')