Update app.py

app.py

@@ -1,7 +1,8 @@
 from langchain_community.document_loaders import UnstructuredMarkdownLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.schema import Document
-from langchain_openai import OpenAIEmbeddings
+# from langchain_openai import OpenAIEmbeddings
+from llama_index.embeddings.huggingface import HuggingFaceEmbedding
 from langchain_community.vectorstores import Chroma
 from dotenv import load_dotenv
 import os