Update app.py

app.py

@@ -16,6 +16,8 @@ from langchain.chains.question_answering import load_qa_chain
 from langchain.retrievers.self_query.base import SelfQueryRetriever
 from kor_retriever_lex import kor_retriever
 from langchain.docstore.document import Document
+from langchain.vectorstores import Pinecone
+from pinecone.client import Client as Pinecone
 from self_query_retriever_lex import metadata_field_info, document_content_description
 from prompts import GRADE_DOCS_PROMPT, GRADE_ANSWER_PROMPT, GRADE_ANSWER_PROMPT_FAST, GRADE_ANSWER_PROMPT_BIAS_CHECK, GRADE_ANSWER_PROMPT_OPENAI, QA_CHAIN_PROMPT_LEX, QA_CHAIN_PROMPT_TRAVEL