Update app.py

app.py

@@ -15,7 +15,8 @@ from langchain.embeddings import OpenAIEmbeddings
 from langchain.vectorstores import Qdrant
 from langchain.chains import VectorDBQA
 from langchain.llms import OpenAI
-
+from langchain_core.output_parsers import StrOutputParser
+from langchain_core.runnables import RunnablePassthrough
 
 import os
 
@@ -160,7 +161,7 @@ rag_chain = (
 from langchain.chat_models import ChatOpenAI
 from langchain.schema import AIMessage, HumanMessage
 import openai
-import os
+
 import gradio as gr
 
 llm = ChatOpenAI(temperature=0.5, model='gpt-4o', openai_api_key=openai_api_key)