Update app.py

app.py

@@ -21,6 +21,7 @@ from langchain.schema import AIMessage, HumanMessage
 from langchain.llms import HuggingFaceHub
 from langchain.llms import HuggingFaceTextGenInference
 from langchain.embeddings import HuggingFaceInstructEmbeddings, HuggingFaceEmbeddings, HuggingFaceBgeEmbeddings, HuggingFaceInferenceAPIEmbeddings
+from langchain.retrievers.tavily_search_api import TavilySearchAPIRetriever
 
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.prompts import PromptTemplate