Update app.py

app.py

@@ -16,6 +16,8 @@ from utills import load_txt_documents, split_docs, load_uploaded_documents, retr
 from langchain.text_splitter import TokenTextSplitter, RecursiveCharacterTextSplitter
 from langchain_community.document_loaders.directory import DirectoryLoader
 from HTML_templates import css, bot_template, user_template
+from langchain_core.output_parsers import StrOutputParser
+from langchain_core.runnables import RunnablePassthrough
 
 
 data_path = "data"