Update app.py

app.py

@@ -5,6 +5,7 @@ from sentence_transformers import SentenceTransformer
 from PyPDF2 import PdfReader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.callbacks.manager import CallbackManager
+from langchain.llms import LlamaCpp 
 from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler
 from langchain.vectorstores import Qdrant
 from transformers import AutoModelForCausalLM