app.py

import gradio as gr
from torchvision.transforms import Compose, Resize, ToTensor, Normalize
from PIL import Image
from torchvision.utils import save_image

from huggan.pytorch.pix2pix.modeling_pix2pix import GeneratorUNet

transform = Compose(
    [
        Resize((256, 256), Image.BICUBIC),
        ToTensor(),
        Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5)),
    ]
)
model = GeneratorUNet.from_pretrained('huggan/pix2pix-cityscapes')

def predict_fn(img):
    inp = transform(img).unsqueeze(0)
    out = model(inp)
    save_image(out, 'out.png', normalize=True)
    return 'out.png'

gr.Interface(predict_fn, inputs=gr.inputs.Image(type='pil'), outputs='image').launch()