app.py

import spaces
import gradio as gr
import torch
from diffusers import UNet2DConditionModel, DDIMInverseScheduler, DDIMScheduler
from utils.pipeline_stable_diffusion_xl import StableDiffusionXLPipeline
import torch
from PIL import Image
import argparse

weak_model = StableDiffusionXLPipeline.from_pretrained("stabilityai/stable-diffusion-xl-base-1.0")
strong_model = StableDiffusionXLPipeline.from_pretrained("stabilityai/stable-diffusion-xl-base-1.0")

def get_generator(random_seed):
    torch.manual_seed(int(random_seed))
    torch.cuda.manual_seed(int(random_seed))
    generator = torch.manual_seed(random_seed)
    return generator

model_dict = {
    "SDXL": None,
    "Human Preference": './ckpt/xlMoreArtFullV1.pREw.safetensors',
    'Batman': './ckpt/batman89000003.BlKn.safetensors',
    'Disney': './ckpt/princessXlV2.WSt4.safetensors',
    'Parchment': './ckpt/ParchartXL.safetensors'
}

# 生成图像的函数
@spaces.GPU(duration=240)
def generate_image(prompt, seed, T, high_cfg, low_cfg, high_lora, low_lora, weak_choice, strong_choice):
    # 设置随机种子
    size = 1024
    guidance_scale = 5.5
    lora_sclae = 0.8
    # device = 'cpu'
    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    if high_lora == 0:
        high_lora = 0.001
    if low_lora == 0:
        low_lora = -0.001    #avoid bug

    # 选择模型
    model_id = "stabilityai/stable-diffusion-xl-base-1.0"
    dtype = torch.float16
    pipe = StableDiffusionXLPipeline.from_pretrained(model_id, torch_dtype=dtype,
                                                     variant='fp16',
                                                     safety_checker=None, requires_safety_checker=False).to(device)
    pipe.scheduler = DDIMScheduler.from_config(pipe.scheduler.config)
    pipe.inv_scheduler = DDIMInverseScheduler.from_pretrained('stabilityai/stable-diffusion-xl-base-1.0',
                                                              subfolder='scheduler')

    # load dpo lora as strong model
    lora_name = strong_choice
    if model_dict[strong_choice] is not None:
        pipe.load_lora_weights(model_dict[strong_choice], adapter_name=lora_name)

    # weak model
    generator = get_generator(seed)
    pipe.disable_lora()
    image_sdxl = pipe(prompt=prompt, height=size, width=size, guidance_scale=guidance_scale,
                      num_inference_steps=T, generator=generator).images[0]

    # strong model
    generator = get_generator(seed)
    if model_dict[lora_name] is not None:
        pipe.enable_lora()
        pipe.set_adapters(lora_name, adapter_weights=lora_sclae)
    image_dpo_lora = pipe(prompt=prompt, height=size, width=size, guidance_scale=guidance_scale,
                          num_inference_steps=T, generator=generator).images[0]

    # W2SD
    generator = get_generator(seed)
    pipe.disable_lora()
    image_w2sd = \
    pipe.w2sd_lora(prompt=prompt, height=size, width=size, guidance_scale=guidance_scale,
                   denoise_lora_scale=lora_sclae,
                   num_inference_steps=T, generator=generator,
                   lora_gap_list=[high_lora, low_lora],
                   cfg_gap_list=[high_cfg, low_cfg], lora_name=lora_name).images[0]

    return image_sdxl, image_dpo_lora, image_w2sd

with gr.Blocks() as app:
    gr.Markdown("# Weak-to-Strong Diffusion with Reflection")
    gr.Markdown("""
        **Note：**
        1. The weak model should not be too weak. It is recommended to set the weak LoRA scale to around (-0.5, 0.5), as otherwise, performance degradation may occur (refer to Figure 9 in the paper).
        2. Due to computational limits, it’s best to avoid setting Timesteps too high (standard is 50). A value of 10-15 is recommended, as higher values can slow down the process significantly.
        """)
    with gr.Row():
        weak_image = gr.Image(label="Generated Image by Weak Model", type="pil")
        strong_image = gr.Image(label="Generated Image by Strong Model", type="pil")
        w2sd_image = gr.Image(label="Generated Image via W2SD", type="pil")

    with gr.Row():
        prompt_input = gr.Textbox(label="Prompt", placeholder="A young girl holding a rose.", lines=2)

    with gr.Row():
        seed_slider = gr.Slider(minimum=0, maximum=9999, step=1, value=42, label="Seed")
        T_slider = gr.Slider(minimum=5, maximum=50, step=1, value=10, label="Timesteps")

    with gr.Row():
        high_lora_slider = gr.Slider(minimum=-2.0, maximum=2.0, step=0.1, value=0.8, label="Select Strong LoRA Scale")
        low_lora_slider = gr.Slider(minimum=-2.0, maximum=2.0, step=0.1, value=-0.5, label="Select Weak LoRA Scale")

        high_cfg_slider = gr.Slider(minimum=-3, maximum=3, step=0.1, value=2.0, label="Select Strong Guidance Scale")
        low_cfg_slider = gr.Slider(minimum=-3, maximum=3, step=0.1, value=1.0, label="Select Weak Guidance Scale")

    with gr.Row():
        weak_model_dropdown = gr.Dropdown(choices=["SDXL"], label="Select Weak Model",
                                          value="SDXL")
        strong_model_dropdown = gr.Dropdown(choices=model_dict.keys(),
                                            label="Select Strong Model", value="Human Preference")

    generate_button = gr.Button("Generate Image")
    generate_button.click(generate_image,
                          inputs=[prompt_input, seed_slider, T_slider, high_cfg_slider, low_cfg_slider, high_lora_slider, low_lora_slider, weak_model_dropdown,
                                  strong_model_dropdown],
                          outputs=[weak_image, strong_image, w2sd_image])

    # Enable the queue feature
    app.queue()

app.launch()
# app.launch(server_name='0.0.0.0', share=True, server_port=7788)