Update app.py

app.py

@@ -64,8 +64,9 @@ bnb_config = BitsAndBytesConfig(
 model = AutoModelForCausalLM.from_pretrained(
    "mistralai/Mistral-7B-Instruct-v0.1",quantization_config=bnb_config,
 )
+new_db = FAISS.load_local("faiss_index", embeddings)
 # Connect query to FAISS index using a retriever
-retriever = db.as_retriever(
+retriever = new_db.as_retriever(
     search_type="mmr",
     search_kwargs={'k': 1}
 )