update

app.py

@@ -7,13 +7,9 @@ import tiktoken
 from langchain.prompts import ChatPromptTemplate
 from operator import  itemgetter
 from langchain_core.runnables import RunnablePassthrough
-from langchain_core.output_parsers import StrOutputParser
 from langchain_openai import ChatOpenAI, OpenAIEmbeddings
 from langchain_community.vectorstores import FAISS
-from langchain_openai import OpenAIEmbeddings
 from langchain.retrievers import MultiQueryRetriever
-from langchain.chains.combine_documents import create_stuff_documents_chain
-from langchain.chains import create_retrieval_chain
 
 from langchain.prompts import ChatPromptTemplate
 from langchain.schema import StrOutputParser