app.py

import spaces
import gradio as gr
import torch
from PIL import Image
from diffusers import DiffusionPipeline, AutoencoderTiny, AutoencoderKL
import random
import uuid
from typing import Tuple, Union, List, Optional, Any, Dict
import numpy as np
import time
import zipfile
from transformers import CLIPTextModel, CLIPTokenizer, T5EncoderModel, T5TokenizerFast

# Description for the app
DESCRIPTION = """## flux realism hpc/."""

# Helper functions
def save_image(img):
    unique_name = str(uuid.uuid4()) + ".png"
    img.save(unique_name)
    return unique_name

def randomize_seed_fn(seed: int, randomize_seed: bool) -> int:
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    return seed

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

# Load pipelines for both models
# Flux.1-dev-realism
base_model_dev = "black-forest-labs/FLUX.1-dev"
pipe_dev = DiffusionPipeline.from_pretrained(base_model_dev, torch_dtype=torch.bfloat16)
lora_repo = "strangerzonehf/Flux-Super-Realism-LoRA"
trigger_word = "Super Realism"
pipe_dev.load_lora_weights(lora_repo)
pipe_dev.to("cuda")

# Flux.1-krea
dtype = torch.bfloat16
device = "cuda" if torch.cuda.is_available() else "cpu"
taef1 = AutoencoderTiny.from_pretrained("madebyollin/taef1", torch_dtype=dtype).to(device)
good_vae = AutoencoderKL.from_pretrained("black-forest-labs/FLUX.1-Krea-dev", subfolder="vae", torch_dtype=dtype).to(device)
pipe_krea = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-Krea-dev", torch_dtype=dtype, vae=taef1).to(device)

# Define the flux_pipe_call_that_returns_an_iterable_of_images for flux.1-krea
@torch.inference_mode()
def flux_pipe_call_that_returns_an_iterable_of_images(
    self,
    prompt: Union[str, List[str]] = None,
    prompt_2: Optional[Union[str, List[str]]] = None,
    height: Optional[int] = None,
    width: Optional[int] = None,
    num_inference_steps: int = 28,
    timesteps: List[int] = None,
    guidance_scale: float = 3.5,
    num_images_per_prompt: Optional[int] = 1,
    generator: Optional[Union[torch.Generator, List[torch.Generator]]] = None,
    latents: Optional[torch.FloatTensor] = None,
    prompt_embeds: Optional[torch.FloatTensor] = None,
    pooled_prompt_embeds: Optional[torch.FloatTensor] = None,
    output_type: Optional[str] = "pil",
    return_dict: bool = True,
    joint_attention_kwargs: Optional[Dict[str, Any]] = None,
    max_sequence_length: int = 512,
    good_vae: Optional[Any] = None,
):
    height = height or self.default_sample_size * self.vae_scale_factor
    width = width or self.default_sample_size * self.vae_scale_factor

    self.check_inputs(
        prompt,
        prompt_2,
        height,
        width,
        prompt_embeds=prompt_embeds,
        pooled_prompt_embeds=pooled_prompt_embeds,
        max_sequence_length=max_sequence_length,
    )

    self._guidance_scale = guidance_scale
    self._joint_attention_kwargs = joint_attention_kwargs
    self._interrupt = False

    batch_size = 1 if isinstance(prompt, str) else len(prompt)
    device = self._execution_device

    lora_scale = joint_attention_kwargs.get("scale", None) if joint_attention_kwargs is not None else None
    prompt_embeds, pooled_prompt_embeds, text_ids = self.encode_prompt(
        prompt=prompt,
        prompt_2=prompt_2,
        prompt_embeds=prompt_embeds,
        pooled_prompt_embeds=pooled_prompt_embeds,
        device=device,
        num_images_per_prompt=num_images_per_prompt,
        max_sequence_length=max_sequence_length,
        lora_scale=lora_scale,
    )

    num_channels_latents = self.transformer.config.in_channels // 4
    latents, latent_image_ids = self.prepare_latents(
        batch_size * num_images_per_prompt,
        num_channels_latents,
        height,
        width,
        prompt_embeds.dtype,
        device,
        generator,
        latents,
    )

    sigmas = np.linspace(1.0, 1 / num_inference_steps, num_inference_steps)
    image_seq_len = latents.shape[1]
    mu = calculate_shift(
        image_seq_len,
        self.scheduler.config.base_image_seq_len,
        self.scheduler.config.max_image_seq_len,
        self.scheduler.config.base_shift,
        self.scheduler.config.max_shift,
    )
    timesteps, num_inference_steps = retrieve_timesteps(
        self.scheduler,
        num_inference_steps,
        device,
        timesteps,
        sigmas,
        mu=mu,
    )
    self._num_timesteps = len(timesteps)

    guidance = torch.full([1], guidance_scale, device=device, dtype=torch.float32).expand(latents.shape[0]) if self.transformer.config.guidance_embeds else None

    for i, t in enumerate(timesteps):
        if self.interrupt:
            continue

        timestep = t.expand(latents.shape[0]).to(latents.dtype)

        noise_pred = self.transformer(
            hidden_states=latents,
            timestep=timestep / 1000,
            guidance=guidance,
            pooled_projections=pooled_prompt_embeds,
            encoder_hidden_states=prompt_embeds,
            txt_ids=text_ids,
            img_ids=latent_image_ids,
            joint_attention_kwargs=self.joint_attention_kwargs,
            return_dict=False,
        )[0]

        latents_for_image = self._unpack_latents(latents, height, width, self.vae_scale_factor)
        latents_for_image = (latents_for_image / self.vae.config.scaling_factor) + self.vae.config.shift_factor
        image = self.vae.decode(latents_for_image, return_dict=False)[0]
        yield self.image_processor.postprocess(image, output_type=output_type)[0]
        
        latents = self.scheduler.step(noise_pred, t, latents, return_dict=False)[0]
        torch.cuda.empty_cache()

    latents = self._unpack_latents(latents, height, width, self.vae_scale_factor)
    latents = (latents / good_vae.config.scaling_factor) + good_vae.config.shift_factor
    image = good_vae.decode(latents, return_dict=False)[0]
    self.maybe_free_model_hooks()
    torch.cuda.empty_cache()
    yield self.image_processor.postprocess(image, output_type=output_type)[0]

pipe_krea.flux_pipe_call_that_returns_an_iterable_of_images = flux_pipe_call_that_returns_an_iterable_of_images.__get__(pipe_krea)

# Helper functions for flux.1-krea
def calculate_shift(
    image_seq_len,
    base_seq_len: int = 256,
    max_seq_len: int = 4096,
    base_shift: float = 0.5,
    max_shift: float = 1.16,
):
    m = (max_shift - base_shift) / (max_seq_len - base_seq_len)
    b = base_shift - m * base_seq_len
    mu = image_seq_len * m + b
    return mu

def retrieve_timesteps(
    scheduler,
    num_inference_steps: Optional[int] = None,
    device: Optional[Union[str, torch.device]] = None,
    timesteps: Optional[List[int]] = None,
    sigmas: Optional[List[float]] = None,
    **kwargs,
):
    if timesteps is not None and sigmas is not None:
        raise ValueError("Only one of `timesteps` or `sigmas` can be passed.")
    if timesteps is not None:
        scheduler.set_timesteps(timesteps=timesteps, device=device, **kwargs)
        timesteps = scheduler.timesteps
        num_inference_steps = len(timesteps)
    elif sigmas is not None:
        scheduler.set_timesteps(sigmas=sigmas, device=device, **kwargs)
        timesteps = scheduler.timesteps
        num_inference_steps = len(timesteps)
    else:
        scheduler.set_timesteps(num_inference_steps, device=device, **kwargs)
        timesteps = scheduler.timesteps
    return timesteps, num_inference_steps

# Styles for flux.1-dev-realism
style_list = [
    {"name": "3840 x 2160", "prompt": "hyper-realistic 8K image of {prompt}. ultra-detailed, lifelike, high-resolution, sharp, vibrant colors, photorealistic", "negative_prompt": ""},
    {"name": "2560 x 1440", "prompt": "hyper-realistic 4K image of {prompt}. ultra-detailed, lifelike, high-resolution, sharp, vibrant colors, photorealistic", "negative_prompt": ""},
    {"name": "HD+", "prompt": "hyper-realistic 2K image of {prompt}. ultra-detailed, lifelike, high-resolution, sharp, vibrant colors, photorealistic", "negative_prompt": ""},
    {"name": "Style Zero", "prompt": "{prompt}", "negative_prompt": ""},
]

styles = {k["name"]: (k["prompt"], k["negative_prompt"]) for k in style_list}
DEFAULT_STYLE_NAME = "3840 x 2160"
STYLE_NAMES = list(styles.keys())

def apply_style(style_name: str, positive: str) -> Tuple[str, str]:
    p, n = styles.get(style_name, styles[DEFAULT_STYLE_NAME])
    return p.replace("{prompt}", positive), n

# Generation function for flux.1-dev-realism
@spaces.GPU
def generate_dev(
    prompt: str,
    negative_prompt: str = "",
    use_negative_prompt: bool = False,
    seed: int = 0,
    width: int = 1024,
    height: int = 1024,
    guidance_scale: float = 3,
    randomize_seed: bool = False,
    style_name: str = DEFAULT_STYLE_NAME,
    num_inference_steps: int = 30,
    num_images: int = 1,
    zip_images: bool = False,
    progress=gr.Progress(track_tqdm=True),
):
    positive_prompt, style_negative_prompt = apply_style(style_name, prompt)
    
    if use_negative_prompt:
        final_negative_prompt = style_negative_prompt + " " + negative_prompt
    else:
        final_negative_prompt = style_negative_prompt
    
    final_negative_prompt = final_negative_prompt.strip()
    
    if trigger_word:
        positive_prompt = f"{trigger_word} {positive_prompt}"
    
    seed = int(randomize_seed_fn(seed, randomize_seed))
    generator = torch.Generator(device="cuda").manual_seed(seed)
    
    start_time = time.time()
    
    images = pipe_dev(
        prompt=positive_prompt,
        negative_prompt=final_negative_prompt if final_negative_prompt else None,
        width=width,
        height=height,
        guidance_scale=guidance_scale,
        num_inference_steps=num_inference_steps,
        num_images_per_prompt=num_images,
        generator=generator,
        output_type="pil",
    ).images
    
    end_time = time.time()
    duration = end_time - start_time
    
    image_paths = [save_image(img) for img in images]
    
    zip_path = None
    if zip_images:
        zip_name = str(uuid.uuid4()) + ".zip"
        with zipfile.ZipFile(zip_name, 'w') as zipf:
            for i, img_path in enumerate(image_paths):
                zipf.write(img_path, arcname=f"Img_{i}.png")
        zip_path = zip_name
    
    return image_paths, seed, f"{duration:.2f}", zip_path

# Generation function for flux.1-krea
@spaces.GPU
def generate_krea(
    prompt: str,
    seed: int = 0,
    width: int = 1024,
    height: int = 1024,
    guidance_scale: float = 4.5,
    randomize_seed: bool = False,
    num_inference_steps: int = 28,
    num_images: int = 1,
    zip_images: bool = False,
    progress=gr.Progress(track_tqdm=True),
):
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    generator = torch.Generator().manual_seed(seed)
    
    start_time = time.time()
    
    images = []
    for _ in range(num_images):
        final_img = list(pipe_krea.flux_pipe_call_that_returns_an_iterable_of_images(
            prompt=prompt,
            guidance_scale=guidance_scale,
            num_inference_steps=num_inference_steps,
            width=width,
            height=height,
            generator=generator,
            output_type="pil",
            good_vae=good_vae,
        ))[-1]  # Take the final image only
        images.append(final_img)
    
    end_time = time.time()
    duration = end_time - start_time
    
    image_paths = [save_image(img) for img in images]
    
    zip_path = None
    if zip_images:
        zip_name = str(uuid.uuid4()) + ".zip"
        with zipfile.ZipFile(zip_name, 'w') as zipf:
            for i, img_path in enumerate(image_paths):
                zipf.write(img_path, arcname=f"Img_{i}.png")
        zip_path = zip_name
    
    return image_paths, seed, f"{duration:.2f}", zip_path

# Main generation function to handle model choice
@spaces.GPU
def generate(
    model_choice: str,
    prompt: str,
    negative_prompt: str = "",
    use_negative_prompt: bool = False,
    seed: int = 0,
    width: int = 1024,
    height: int = 1024,
    guidance_scale: float = 3,
    randomize_seed: bool = False,
    style_name: str = DEFAULT_STYLE_NAME,
    num_inference_steps: int = 30,
    num_images: int = 1,
    zip_images: bool = False,
    progress=gr.Progress(track_tqdm=True),
):
    if model_choice == "flux.1-dev-realism":
        return generate_dev(
            prompt=prompt,
            negative_prompt=negative_prompt,
            use_negative_prompt=use_negative_prompt,
            seed=seed,
            width=width,
            height=height,
            guidance_scale=guidance_scale,
            randomize_seed=randomize_seed,
            style_name=style_name,
            num_inference_steps=num_inference_steps,
            num_images=num_images,
            zip_images=zip_images,
            progress=progress,
        )
    elif model_choice == "flux.1-krea-dev":
        return generate_krea(
            prompt=prompt,
            seed=seed,
            width=width,
            height=height,
            guidance_scale=guidance_scale,
            randomize_seed=randomize_seed,
            num_inference_steps=num_inference_steps,
            num_images=num_images,
            zip_images=zip_images,
            progress=progress,
        )
    else:
        raise ValueError("Invalid model choice")

# Examples (tailored for flux.1-dev-realism)
examples = [
    "High-resolution photograph, woman, UHD, photorealistic, shot on a Sony A7III --chaos 20 --ar 1:2 --style raw --stylize 250",
    "Headshot of handsome young man, wearing dark gray sweater with buttons and big shawl collar, brown hair and short beard, serious look on his face, black background, soft studio lighting, portrait photography --ar 85:128 --v 6.0 --style",
    "Purple Dreamy, a medium-angle shot of a young woman with long brown hair, wearing a pair of eye-level glasses, stands in front of a backdrop of purple and white lights."
]

css = '''
.gradio-container {
    max-width: 590px !important;
    margin: 0 auto !important;
}
h1 {
    text-align: center;
}
footer {
    visibility: hidden;
}
'''

# Gradio interface
with gr.Blocks(css=css, theme="bethecloud/storj_theme") as demo:
    gr.Markdown(DESCRIPTION)
    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, variant="primary")
    result = gr.Gallery(label="Result", columns=1, show_label=False, preview=True)
    
    with gr.Row():
    # Model choice radio button above additional options
        model_choice = gr.Radio(
            choices=["flux.1-krea-dev", "flux.1-dev-realism"],
            label="Select Model",
            value="flux.1-krea-dev"
        )
    
    with gr.Accordion("Additional Options", open=False):
        style_selection = gr.Dropdown(
            label="Quality Style (for flux.1-dev-realism only)",
            choices=STYLE_NAMES,
            value=DEFAULT_STYLE_NAME,
            interactive=True,
        )
        use_negative_prompt = gr.Checkbox(label="Use negative prompt (for flux.1-dev-realism only)", value=False)
        negative_prompt = gr.Text(
            label="Negative prompt",
            max_lines=1,
            placeholder="Enter a negative prompt",
            visible=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=512,
                maximum=2048,
                step=64,
                value=1024,
            )
            height = gr.Slider(
                label="Height",
                minimum=512,
                maximum=2048,
                step=64,
                value=1024,
            )
        guidance_scale = gr.Slider(
            label="Guidance Scale",
            minimum=0.1,
            maximum=20.0,
            step=0.1,
            value=4.5,
        )
        num_inference_steps = gr.Slider(
            label="Number of inference steps",
            minimum=1,
            maximum=40,
            step=1,
            value=28,
        )
        num_images = gr.Slider(
            label="Number of images",
            minimum=1,
            maximum=5,
            step=1,
            value=1,
        )
        zip_images = gr.Checkbox(label="Zip generated images", value=False)
        
        gr.Markdown("### Output Information")
        seed_display = gr.Textbox(label="Seed used", interactive=False)
        generation_time = gr.Textbox(label="Generation time (seconds)", interactive=False)
        zip_file = gr.File(label="Download ZIP")

    gr.Examples(
        examples=examples,
        inputs=prompt,
        outputs=[result, seed_display, generation_time, zip_file],
        fn=generate,
        cache_examples=False,
    )

    use_negative_prompt.change(
        fn=lambda x: gr.update(visible=x),
        inputs=use_negative_prompt,
        outputs=negative_prompt,
        api_name=False,
    )

    gr.on(
        triggers=[
            prompt.submit,
            run_button.click,
        ],
        fn=generate,
        inputs=[
            model_choice,
            prompt,
            negative_prompt,
            use_negative_prompt,
            seed,
            width,
            height,
            guidance_scale,
            randomize_seed,
            style_selection,
            num_inference_steps,
            num_images,
            zip_images,
        ],
        outputs=[result, seed_display, generation_time, zip_file],
        api_name="run",
    )

if __name__ == "__main__":
    demo.queue(max_size=120).launch(mcp_server=True, ssr_mode=False, show_error=True)