app.py

import gradio as gr
from diffusers import StableDiffusionXLPipeline, DDIMScheduler
import torch
import sa_handler
import math
from diffusers.utils import load_image
import inversion
import numpy as np

# init models

scheduler = DDIMScheduler(
    beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear",
    clip_sample=False, set_alpha_to_one=False)

pipeline = StableDiffusionXLPipeline.from_pretrained(
    "stabilityai/stable-diffusion-xl-base-1.0", torch_dtype=torch.float16, variant="fp16",
    use_safetensors=True,
    scheduler=scheduler
).to("cuda")

pipeline.enable_model_cpu_offload() 
pipeline.enable_vae_slicing()

# DDIM inversion

global zts, src_style, src_prompt

def load_refs(ref_path, ref_style, ref_prompt, prompt1, prompt2, prompt3):

    src_style = f"{ref_style}"
    src_prompt = f"{ref_prompt}, {src_style}."
    image_path = f"{ref_path}"

    num_inference_steps = 50
    x0 = np.array(load_image(image_path).resize((1024, 1024)))
    zts = inversion.ddim_inversion(pipeline, x0, src_prompt, num_inference_steps, 2)
    #mediapy.show_image(x0, title="innput reference image", height=256)
    return "ready"

def run(prompt1, prompt2, prompt3):
    # run StyleAligned
    prompts = [
        src_prompt,
        prompt1,
        prompt2,
        prompt3
    ]

    # some parameters you can adjust to control fidelity to reference
    shared_score_shift = np.log(2)  # higher value induces higher fidelity, set 0 for no shift
    shared_score_scale = 1.0  # higher value induces higher, set 1 for no rescale

    # for very famouse images consider supressing attention to refference, here is a configuration example:
    # shared_score_shift = np.log(1)
    # shared_score_scale = 0.5

    for i in range(1, len(prompts)):
        prompts[i] = f'{prompts[i]}, {src_style}.'

    handler = sa_handler.Handler(pipeline)
    sa_args = sa_handler.StyleAlignedArgs(
        share_group_norm=True, share_layer_norm=True, share_attention=True,
        adain_queries=True, adain_keys=True, adain_values=False,
        shared_score_shift=shared_score_shift, shared_score_scale=shared_score_scale,)
    handler.register(sa_args)

    zT, inversion_callback = inversion.make_inversion_callback(zts, offset=5)

    g_cpu = torch.Generator(device='cuda')
    g_cpu.manual_seed(10)

    latents = torch.randn(len(prompts), 4, 128, 128, device='cuda', generator=g_cpu,
                      dtype=pipeline.unet.dtype,).to('cuda')
    latents[0] = zT

    images_a = pipeline(prompts, latents=latents,
                    callback_on_step_end=inversion_callback,
                    num_inference_steps=num_inference_steps, guidance_scale=10.0).images

    handler.remove()
    #mediapy.show_images(images_a, titles=[p[:-(len(src_style) + 3)] for p in prompts])

    return images_a

with gr.Blocks() as demo:
    with gr. Column():
        gr.HTML("""
        <h2 style="text-align: center;">Google's StyleAligned Transfer</h2>
        """            
        )
    with gr.Row():
        with gr.Column():
            ref_path = gr.Image(type="filepath", value="./example_image/medieval-bed.jpeg")
            ref_style = gr.Textbox(label="Reference style", value="medieval painting")
            ref_prompt = gr.Textbox(label="Referéce prompt", value="Man laying on bed")
            load_ref_btn = gr.Button("Load Reference")
        with gr.Column():
            is_ready = gr.Textbox(label = "Ref status")
            prompt1 = gr.Textbox(label="Prompt1", value="A man working on a laptop")
            prompt2 = gr.Textbox(label="Prompt2", value="A man eating pizza")
            prompt3 = gr.Textbox(label="Prompt3", value="A woman playing on saxophone")
            run_button = gr.Button("Submit")
        with gr.Column():
            results = gr.Gallery()
    load_ref_btn.click(
        fn = load_refs,
        inputs = [
            ref_path,
            ref_style,
            ref_prompt
        ],
        outputs = [
            is_ready
        ],
        queue = False
    )
    run_button.click(
        fn = run,
        inputs = [
            ref_path, ref_style, ref_prompt,
            prompt1, prompt2, prompt3    
        ],
        outputs = [
            results
        ]
    )

demo.queue().launch()