Update app.py

app.py

@@ -9,10 +9,9 @@ import textwrap
 from langchain.document_loaders import PyPDFLoader, DirectoryLoader, PDFMinerLoader 
 from langchain.text_splitter import RecursiveCharacterTextSplitter 
 from langchain.embeddings import SentenceTransformerEmbeddings 
-from langchain.vectorstores import Chroma 
+from langchain.vectorstores import FAISS
 from langchain.llms import HuggingFacePipeline
 from langchain.chains import RetrievalQA 
-from constants import CHROMA_SETTINGS
 from streamlit_chat import message
 
 st.set_page_config(layout="wide")