app.py

import gradio as gr
from llama_index import GPTSimpleVectorIndex

with gr.Blocks() as demo:
    chatbot = gr.Chatbot()
    msg = gr.Textbox()
    clear = gr.Button("Clear")

    def respond(message, chat_history):
        bot_message = str(index.query(message)).strip()
        chat_history.append((message, bot_message))
        return "", chat_history

    msg.submit(respond, [msg, chatbot], [msg, chatbot])
    clear.click(lambda: None, None, chatbot, queue=False)

if __name__ == "__main__":
    global index
    index = GPTSimpleVectorIndex.load_from_disk('email.json')
    demo.launch()