app.py

import gradio as gr

api=gr.Interface.load("huggingface/EleutherAI/gpt-j-6B")

def complete_with_gpt(text):
  return text[:-50]+api(text[-50:])

with gr.Blocks()as demo:
    with gr.Row():
         textbox=gr.Textbox(placeholder="Type here and press enter...",lines=8)
        with gr.Column():
            btn=gr.Button("Generate")

btn.click(complete_with_gpt,textbox,textbox)

demo.launch()