Update app.py

app.py

@@ -6,17 +6,15 @@ from PyPDF2 import PdfReader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.embeddings.huggingface import HuggingFaceEmbeddings
 from langchain.vectorstores import chroma
-from langchain.chains.retrieval_qa.base import RetrievalQA
+#from langchain.chains.retrieval_qa.base import RetrievalQA
 from langchain.chains.question_answering import load_qa_chain
 from langchain_community.llms import huggingface_hub
 from langchain.document_loaders.pdf import PyMuPDFLoader 
 #from transformers import AutoTokenizer, AutoModelForCausalLM
-import torch
-
 #from langchain.llms import huggingface_endpoint
-import os
-import fitz
-import tempfile
+#import os
+#import fitz
+#import tempfile
 
 img = Image.open('image/nexio_logo1.png')
 st.set_page_config(page_title="PDF Chatbot App",page_icon=img,layout="centered")