Update main.py

main.py

@@ -1,7 +1,7 @@
 from langchain.chains import RetrievalQA, ConversationalRetrievalChain
 from langchain.vectorstores import Chroma
 from langchain.text_splitter import CharacterTextSplitter
-    from langchain.document_loaders import DirectoryLoader, TextLoader,PyPDFLoader
+from langchain.document_loaders import DirectoryLoader, TextLoader,PyPDFLoader
 from transformers import pipeline
 from langchain.llms import HuggingFacePipeline
 from langchain.embeddings import HuggingFaceInstructEmbeddings