app.py

import gradio as gr
import numpy as np
import random
import torch
import spaces
from diffusers import  DiffusionPipeline, FlowMatchEulerDiscreteScheduler

pipe = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-dev", torch_dtype=torch.bfloat16).to(device)

MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 2048

@spaces.GPU(duration=190)
def infer(prompt, seed=42, randomize_seed=False, width=1024, height=1024, guidance_scale=5.0, num_inference_steps=28, progress=gr.Progress(track_tqdm=True)):
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    generator = torch.Generator().manual_seed(seed)
    image = pipe(
        prompt = prompt, 
        width = width,
        height = height,
        num_inference_steps = num_inference_steps, 
        generator = generator,
        guidance_scale=guidance_scale
    ).images[0] 
    return image, seed
 
examples = [
    "a cat holding a sign that says hello world",
    "A scene full of classic video game characters as stickers on a black water bottle",
    "A futuristic biocity that is located in the former site of Portsmouth, New Hampshire. It has a mix of old and new buildings, green spaces, and water features. It also has six large artificial floating islands off of its coastline,(zenithal angle), ((by Iwan Baan)), coastal city,blue sky and white clouds,the sun is shining brightly,ultra-wide angle,",
    "Depict a breathtaking scene of a meteor rain showering down from a starry night sky. The meteors should vary in size and brightness, streaking across the sky with vibrant tails of light, creating a dazzling display. Below, a serene landscape—perhaps a tranquil lake reflecting the celestial spectacle, or a rugged mountain range—should enhance the sense of wonder. The foreground can include silhouettes of trees or figures gazing up in awe at the cosmic event. The overall atmosphere should evoke feelings of magic and inspiration, capturing the beauty and mystery of the universe.",
]



css="""
col-container {
    margin: 0 auto;
    max-width: 520px;
}
"""

with gr.Blocks(css=css) as demo:
    
    with gr.Column(elem_id="col-container"):
        gr.Markdown(f"""Generate an image with Flux. Please review the license if you are not familiar with it. Not for Commercial Use!]
        """)
        
        with gr.Row():
            
            prompt = gr.Text(
                label="Prompt",
                show_label=False,
                max_lines=1,
                placeholder="Enter your prompt",
                container=False,
            )
            
            run_button = gr.Button("Run", scale=0)
        
        result = gr.Image(label="Result", show_label=False)
        
        with gr.Accordion("Advanced Settings", open=False):
            
            seed = gr.Slider(
                label="Seed",
                minimum=0,
                maximum=MAX_SEED,
                step=1,
                value=0,
            )
            
            randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
            
            with gr.Row():
                
                width = gr.Slider(
                    label="Width",
                    minimum=256,
                    maximum=MAX_IMAGE_SIZE,
                    step=32,
                    value=1024,
                )
                
                height = gr.Slider(
                    label="Height",
                    minimum=256,
                    maximum=MAX_IMAGE_SIZE,
                    step=32,
                    value=1024,
                )
            
            with gr.Row():

                guidance_scale = gr.Slider(
                    label="Guidance Scale",
                    minimum=1,
                    maximum=15,
                    step=0.1,
                    value=3.5,
                )
  
                num_inference_steps = gr.Slider(
                    label="Number of inference steps",
                    minimum=1,
                    maximum=50,
                    step=1,
                    value=28,
                )
        
        gr.Examples(
            examples = examples,
            fn = infer,
            inputs = [prompt],
            outputs = [result, seed],
            cache_examples="lazy"
        )


    gr.on(
        triggers=[run_button.click, prompt.submit],
        fn = infer,
        inputs = [prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps],
        outputs = [result, seed]
    )

demo.launch()