Update app.py

app.py

@@ -31,6 +31,9 @@ from huggingface_hub import CommitScheduler
 from huggingface_hub import hf_hub_download
 import zipfile
 from langchain_community.vectorstores import Chroma
+from langchain_community.embeddings.sentence_transformer import (
+    SentenceTransformerEmbeddings
+)
 #from google.colab import userdata, drive
 from pathlib import Path
 from langchain.document_loaders import PyPDFDirectoryLoader