app.py

import gradio as gr
from langchain.vectorstores import Chroma
from langchain import HuggingFaceHub
from langchain.embeddings import HuggingFaceEmbeddings
from langchain.text_splitter import CharacterTextSplitter
from langchain.document_loaders import TextLoader
from langchain.chains import RetrievalQA
import os
os.environ['HUGGINGFACEHUB_API_TOKEN'] = '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'
llm = HuggingFaceHub(repo_id="google/flan-t5-xxl")