Update app.py

app.py

@@ -5,6 +5,9 @@ from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.chat_models import ChatOpenAI
 from langchain.chains import RetrievalQA
 from langchain_community.document_loaders import TextLoader
+import chromadb
+
+chromadb.api.client.SharedSystemClient.clear_system_cache()
 
 import os
 os.environ["OPENAI_API_KEY"]=os.getenv('OPENAI_API_KEY')