Update app.py

app.py

@@ -8,7 +8,7 @@ from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.vectorstores import Chroma
 from langchain_community.document_loaders import UnstructuredPDFLoader
 from langchain.text_splitter import CharacterTextSplitter
-from langchain.chains.qa_with_sources import load_qa_with_sources_from_chain_type
+from langchain.chains.qa_with_sources import RetrievalQAWithSourcesChain
 from langchain.schema import Document
 from langchain.memory import ConversationBufferMemory
 from langchain.callbacks.manager import CallbackManager
@@ -23,7 +23,6 @@ import logging
 # Update the embedding function creation
 embedding_function = HuggingFaceEmbeddings()
 
-# ... rest of your code ...
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)