Update app.py

app.py

@@ -7,7 +7,7 @@ import sys
 from langchain.embeddings.sentence_transformer import SentenceTransformerEmbeddings
 from sentence_transformers import SentenceTransformer
 from langchain.text_splitter import CharacterTextSplitter
-from langchain.embeddings import OpenAIEmbeddings
+#from langchain.embeddings import OpenAIEmbeddings
 from langchain.vectorstores import Chroma
 from langchain.document_loaders import PyPDFLoader
 from fastapi.encoders import jsonable_encoder