Update app.py

app.py

@@ -6,6 +6,8 @@ from langchain.prompts import PromptTemplate
 from langchain.chains import RetrievalQA, ConversationalRetrievalChain
 from langchain.memory import ConversationBufferMemory
 import warnings
+from transformers import pipeline
+import torch
 from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig
 import os
 from dotenv import load_dotenv