flux-lightning / app.py
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import spaces
import gradio as gr
import numpy as np
import random
import torch
from diffusers import DiffusionPipeline
dtype = torch.bfloat16
device = "cuda" if torch.cuda.is_available() else "cpu"
pipe = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-schnell", torch_dtype=dtype).to(device)
MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 2048
@spaces.GPU()
def infer(prompt, seed=42, randomize_seed=False, width=1024, height=1024, num_inference_steps=4, 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=0.0
).images[0]
return image, seed
# Example prompt
example_prompt = "A vibrant red origami crane on a white background, intricate paper folds, studio lighting"
# Gradio interface
with gr.Blocks() as demo:
gr.Markdown("# FLUX.1 [schnell] Image Generator")
with gr.Row():
with gr.Column(scale=2):
gr.Markdown("""
## About FLUX.1 [schnell]
- Fast text-to-image model optimized for local development and personal use
- Part of the FLUX.1 model family by Black Forest Labs
- Open-source: Available under Apache 2.0 license
- Supports resolutions between 0.1 and 2.0 megapixels
- Outperforms many larger models in quality and prompt adherence
- Uses advanced transformer architecture with flow matching techniques
- Capable of generating high-quality images in just a few inference steps
""")
with gr.Column(scale=3):
prompt = gr.Textbox(label="Prompt", placeholder="Enter your image description here...", value=example_prompt)
run_button = gr.Button("Generate")
result = gr.Image(label="Generated Image")
gr.Markdown("""
## Example Prompt
Try this example prompt or modify it to see how FLUX.1 [schnell] performs:
```
A vibrant red origami crane on a white background, intricate paper folds, studio lighting
```
""")
with gr.Accordion("Advanced Settings", open=False):
seed = gr.Slider(minimum=0, maximum=MAX_SEED, step=1, label="Seed", randomize=True)
randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
width = gr.Slider(minimum=256, maximum=MAX_IMAGE_SIZE, step=32, value=1024, label="Width")
height = gr.Slider(minimum=256, maximum=MAX_IMAGE_SIZE, step=32, value=1024, label="Height")
num_inference_steps = gr.Slider(minimum=1, maximum=50, step=1, value=4, label="Number of inference steps")
gr.Markdown("""
**Note:** FLUX.1 [schnell] is optimized for speed and can produce high-quality results with just a few inference steps.
Adjust the number of steps based on your speed/quality preference. More steps may improve quality but will increase generation time.
""")
gr.Markdown("""
## Additional Information
- FLUX.1 [schnell] is based on a hybrid architecture of multimodal and parallel diffusion transformer blocks
- It supports various aspect ratios within the 0.1 to 2.0 megapixel range
- The model uses bfloat16 precision for efficient computation
- For optimal performance, running on a CUDA-enabled GPU is recommended
- For more details and other FLUX.1 variants, visit [Black Forest Labs](https://blackforestlabs.ai)
""")
run_button.click(
infer,
inputs=[prompt, seed, randomize_seed, width, height, num_inference_steps],
outputs=[result, seed]
)
demo.launch()