Update app.py

app.py

@@ -2,6 +2,8 @@ from datasets import load_dataset
 from datasets import Dataset
 from langchain.docstore.document import Document as LangchainDocument
 from sentence_transformers import SentenceTransformer
+from langchain_community.document_loaders import WebBaseLoader
+
 
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.document_loaders import PyPDFLoader, DirectoryLoader