app.py

import gradio as gr
from transformers import pipeline

pipe = pipeline("image-to-text", 
                model="Salesforce/blip-image-captioning-base")

def launch(input):
    out = pipe(input)
    return out[0]['generated_text']

iface = gr.Interface(launch,
                    inputs = gr.Image(type='pil'),
                    outputs="text")

iface.launch()