app.py

import gradio as gr
from happytransformer import HappyTextToText, TTSettings

happy_tt = HappyTextToText("T5", "vennify/t5-base-grammar-correction")
args = TTSettings(num_beams=5, min_length=1)

def fix(bad):
  result = happy_tt.generate_text("grammar: " + bad, args=args)
  return result

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