Update app.py

app.py

@@ -6,6 +6,8 @@ from PyPDF2 import PdfReader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.callbacks.manager import CallbackManager
 from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler
+from langchain.llms import LlamaCpp 
+
 from langchain.vectorstores import Qdrant
 from transformers import AutoModelForCausalLM