app.py

import gradio as gr
import numpy as np
import random
import spaces
import torch
from diffusers import FluxPipeline

dtype = torch.bfloat16
device = "cuda" if torch.cuda.is_available() else "cpu"

pipe = FluxPipeline.from_pretrained("sayakpaul/FLUX.1-merged", torch_dtype=torch.bfloat16).to(device)

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


def infer(prompt, seed=42, randomize_seed=False, width=1024, height=1024, guidance_scale=3.5, num_inference_steps=8, output_format="png"):
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    if width*height*num_inference_steps <= 1024*1024*8:
        return infer_in_1min(prompt=prompt, seed=seed, randomize_seed=randomize_seed, width=width, height=height, guidance_scale=guidance_scale, num_inference_steps=num_inference_steps, output_format=output_format)
    else:
        return infer_in_5min(prompt=prompt, seed=seed, randomize_seed=randomize_seed, width=width, height=height, guidance_scale=guidance_scale, num_inference_steps=num_inference_steps, output_format=output_format)

@spaces.GPU(duration=60)
def infer_in_1min(prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps, output_format):
    return infer_on_gpu(prompt=prompt, seed=seed, randomize_seed=randomize_seed, width=width, height=height, guidance_scale=guidance_scale, num_inference_steps=num_inference_steps, output_format=output_format)

@spaces.GPU(duration=300)
def infer_in_5min(prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps, output_format):
    return infer_on_gpu(prompt=prompt, seed=seed, randomize_seed=randomize_seed, width=width, height=height, guidance_scale=guidance_scale, num_inference_steps=num_inference_steps, output_format=output_format)

def infer_on_gpu(prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps, output_format, progress=gr.Progress(track_tqdm=True)):
    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 gr.update(format = output_format, value = image), seed
 
examples = [
    "a tiny astronaut hatching from an egg on the moon",
    "a cat holding a sign that says hello world",
    "an anime illustration of a wiener schnitzel",
]

with gr.Blocks(delete_cache=(4000, 4000)) as demo:
    
    with gr.Column(elem_id="col-container"):
        gr.Markdown(f"""# [FLUX.1 [merged]](https://huggingface.co/sayakpaul/FLUX.1-merged)
Merge by [Sayak Paul](https://huggingface.co/sayakpaul) of 2 of the 12B param rectified flow transformers [FLUX.1 [dev]](https://huggingface.co/black-forest-labs/FLUX.1-dev) and [FLUX.1 [schnell]](https://huggingface.co/black-forest-labs/FLUX.1-schnell) by [Black Forest Labs](https://blackforestlabs.ai/)
        """)
        
        prompt = gr.Text(
            label = "Prompt",
            show_label = False,
            lines = 2,
            autofocus = True,
            placeholder = "Enter your prompt",
            container = False
        )

        output_format = gr.Radio([["*.png", "png"], ["*.webp", "webp"], ["*.jpeg", "jpeg"], ["*.gif", "gif"], ["*.bmp", "bmp"]], label="Image format for result", info="File extention", value="png", interactive=True)

        with gr.Accordion("Advanced Settings", open=False):
            
            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,
                )
        
            num_inference_steps = gr.Slider(
                label="Number of inference steps",
                minimum=1,
                maximum=50,
                step=1,
                value=4,
            )
            
            guidance_scale = gr.Slider(
                label="Guidance Scale",
                minimum=1,
                maximum=15,
                step=0.1,
                value=3.5,
            )
            
            seed = gr.Slider(
                label="Seed",
                minimum=0,
                maximum=MAX_SEED,
                step=1,
                value=0,
            )
            
            randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
        
        run_button = gr.Button(value = "🚀 Generate", variant="primary")
        
        result = gr.Image(label="Result", show_label=False, format="png")
        
        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, output_format],
        outputs = [result, seed]
    )

demo.queue(default_concurrency_limit=2).launch(show_error=True)