app.py

import gradio as gr
import numpy as np
import random
import spaces #[uncomment to use ZeroGPU]
from diffusers import DiffusionPipeline
import torch

device = "cuda" if torch.cuda.is_available() else "cpu"
model_repo_id = "black-forest-labs/FLUX.1-dev" #Replace to the model you would like to use

if torch.cuda.is_available():
    torch_dtype = torch.bfloat16
else:
    torch_dtype = torch.float32

pipe = DiffusionPipeline.from_pretrained(model_repo_id, torch_dtype=torch_dtype, custom_pipeline="pipeline_flux_with_cfg")
pipe = pipe.to(device)

MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 1024

@spaces.GPU(duration=75) #[uncomment to use ZeroGPU]
def infer(prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, true_guidance, num_inference_steps, lora_model, progress=gr.Progress(track_tqdm=True)):

    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
        
    generator = torch.Generator().manual_seed(seed)
    pipe.unload_lora_weights()
    
    if lora_model: 
        pipe.load_lora_weights(lora_model)
        
    image = pipe(
        prompt = prompt, 
        negative_prompt = negative_prompt,
        guidance_scale = guidance_scale, 
        true_cfg = true_guidance,
        num_inference_steps = num_inference_steps, 
        width = width, 
        height = height,
        generator = generator
    ).images[0] 
    
    return image, seed

examples = [
    "Astronaut in a jungle, cold color palette, muted colors, detailed, 8k",
    "An astronaut riding a green horse",
    "A delicious ceviche cheesecake slice",
]

css="""
#col-container {
    margin: 0 auto;
    max-width: 760px;
}
#button{
    align-self: stretch;
}
"""

with gr.Blocks(css=css) as demo:
    
    with gr.Column(elem_id="col-container"):
        gr.Markdown(f"""
        # FLUX.1 [dev] with CFG (and negative prompts)
        """)
        
        #with gr.Row():
        with gr.Row():
            prompt = gr.Text(
                label="Prompt",
                max_lines=1,
                placeholder="Enter your prompt",
            )
            negative_prompt = gr.Text(
                label="Negative prompt",
                max_lines=1,
                placeholder="Enter a negative prompt",
            )
        with gr.Row():
            guidance_scale = gr.Slider(
                label="Distilled Guidance",
                minimum=1.0,
                maximum=10.0,
                step=0.1,
                value=1.0, #Replace with defaults that work for your model
            )
            true_guidance = gr.Slider(
                label="True CFG",
                minimum=1.0,
                maximum=10.0,
                step=0.1,
                value=5.0, #Replace with defaults that work for your model
            )
            run_button = gr.Button("Run", scale=0, elem_id="button")
        
        result = gr.Image(label="Result", show_label=False)

        with gr.Accordion("Advanced Settings", open=False):
            
            lora_model = gr.Textbox(label="LoRA model id", placeholder="multimodalart/flux-tarot-v1 ")
            
            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, #Replace with defaults that work for your model
                )
                
                height = gr.Slider(
                    label="Height",
                    minimum=256,
                    maximum=MAX_IMAGE_SIZE,
                    step=32,
                    value=1024, #Replace with defaults that work for your model
                )
            
            with gr.Row():
                
                
                
                num_inference_steps = gr.Slider(
                    label="Number of inference steps",
                    minimum=1,
                    maximum=50,
                    step=1,
                    value=28, #Replace with defaults that work for your model
                )
        
        gr.Examples(
            examples = examples,
            inputs = [prompt]
        )
    gr.on(
        triggers=[run_button.click, prompt.submit, negative_prompt.submit],
        fn = infer,
        inputs = [prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, true_guidance, num_inference_steps, lora_model],
        outputs = [result, seed]
    )

demo.queue().launch(ssr_mode = False)