app.py

from transformers import pipeline, Conversation
import gradio as gr
chatbot = pipeline(task="conversational",model="facebook/blenderbot-400M-distill")

def launch(msg):
    conversation = Conversation(msg)
    conversation = chatbot(conversation)
    return conversation

iface = gr.Interface(launch,
                     inputs= gr.Textbox(),outputs="text")

iface.launch()