app.py

import spaces
import gradio as gr
import torch
import nltk
import numpy as np
from PIL import Image, ImageDraw

from diffusers import DDIMScheduler
from pipeline_stable_diffusion_xl_opt import StableDiffusionXLPipeline
from injection_utils import regiter_attention_editor_diffusers
from bounded_attention import BoundedAttention
from pytorch_lightning import seed_everything

from functools import partial

RESOLUTION = 256
MIN_SIZE = 0.01
WHITE = 255
COLORS = ["red", "blue", "green", "orange", "purple", "turquoise", "olive"]


def inference(
    boxes,
    prompts,
    subject_token_indices,
    filter_token_indices,
    num_tokens,
    init_step_size,
    final_step_size,
    num_clusters_per_subject,
    cross_loss_scale,
    self_loss_scale,
    classifier_free_guidance_scale,
    num_iterations,
    loss_threshold,
    num_guidance_steps,
    seed,
):
    if not torch.cuda.is_available():
        raise gr.Error("cuda is not available")

    device = torch.device("cuda")
    model_path = "stabilityai/stable-diffusion-xl-base-1.0"
    scheduler = DDIMScheduler(beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", clip_sample=False, set_alpha_to_one=False)
    model = StableDiffusionXLPipeline.from_pretrained(model_path, scheduler=scheduler, torch_dtype=torch.float16).to(device)
    model.unet.set_default_attn_processor()
    model.enable_sequential_cpu_offload()

    seed_everything(seed)
    start_code = torch.randn([len(prompts), 4, 128, 128], device=device)
    eos_token_index = num_tokens + 1

    editor = BoundedAttention(
        boxes,
        prompts,
        subject_token_indices,
        list(range(70, 82)),
        list(range(70, 82)),
        filter_token_indices=filter_token_indices,
        eos_token_index=eos_token_index,
        cross_loss_coef=cross_loss_scale,
        self_loss_coef=self_loss_scale,
        max_guidance_iter=num_guidance_steps,
        max_guidance_iter_per_step=num_iterations,
        start_step_size=init_step_size,
        end_step_size=final_step_size,
        loss_stopping_value=loss_threshold,
        num_clusters_per_box=num_clusters_per_subject,
    )

    regiter_attention_editor_diffusers(model, editor)

    return model(prompts, latents=start_code, guidance_scale=classifier_free_guidance_scale).images


@spaces.GPU
def generate(
    prompt,
    subject_token_indices,
    filter_token_indices,
    num_tokens,
    init_step_size,
    final_step_size,
    num_clusters_per_subject,
    cross_loss_scale,
    self_loss_scale,
    classifier_free_guidance_scale,
    batch_size,
    num_iterations,
    loss_threshold,
    num_guidance_steps,
    seed,
    boxes
):
    subject_token_indices = convert_token_indices(subject_token_indices, nested=True)
    if len(boxes) != len(subject_token_indices):
        raise gr.Error("""
            The number of boxes should be equal to the number of subjects.
            Number of boxes drawn: {}, number of subjects: {}.
        """.format(len(boxes), len(subject_token_indices)))

    filter_token_indices = convert_token_indices(filter_token_indices) if len(filter_token_indices.strip()) > 0 else None
    num_tokens = int(num_tokens) if len(num_tokens.strip()) > 0 else None
    prompts = [prompt.strip('.').strip(',').strip()] * batch_size

    images = inference(
        boxes, prompts, subject_token_indices, filter_token_indices, num_tokens, init_step_size,
        final_step_size, num_clusters_per_subject, cross_loss_scale, self_loss_scale, classifier_free_guidance_scale,
        num_iterations, loss_threshold, num_guidance_steps, seed)

    return images


def convert_token_indices(token_indices, nested=False):
    if nested:
        return [convert_token_indices(indices, nested=False) for indices in token_indices.split(';')]

    return [int(index.strip()) for index in token_indices.split(',') if len(index.strip()) > 0]


def draw(sketchpad):
    boxes = []
    for i, layer in enumerate(sketchpad['layers']):
        non_zeros = layer.nonzero()
        x1 = x2 = y1 = y2 = 0
        if len(non_zeros[0]) > 0:
            x1x2 = non_zeros[1] / layer.shape[1]
            y1y2 = non_zeros[0] / layer.shape[0]
            x1 = x1x2.min()
            x2 = x1x2.max()
            y1 = y1y2.min()
            y2 = y1y2.max()

        if (x2 - x1 < MIN_SIZE) or (y2 - y1 < MIN_SIZE):
            raise gr.Error(f'Box in layer {i} is too small')

        boxes.append((x1, y1, x2, y2))

    layout_image = draw_boxes(boxes)
    return [boxes, layout_image]


def draw_boxes(boxes):
    if len(boxes) == 0:
        return None

    boxes = np.array(boxes) * RESOLUTION
    image = Image.new('RGB', (RESOLUTION, RESOLUTION), (WHITE, WHITE, WHITE))
    drawing = ImageDraw.Draw(image)
    for i, box in enumerate(boxes.astype(int).tolist()):
        drawing.rectangle(box, outline=COLORS[i % len(COLORS)], width=4)

    return image


def clear(batch_size):
    return [[], None, None, None]


def main():
    css = """
    #paper-info a {
        color:#008AD7;
        text-decoration: none;
    }
    #paper-info a:hover {
        cursor: pointer;
        text-decoration: none;
    }

    .tooltip {
        color: #555;
        position: relative;
        display: inline-block;
        cursor: pointer;
    }

    .tooltip .tooltiptext {
        visibility: hidden;
        width: 400px;
        background-color: #555;
        color: #fff;
        text-align: center;
        padding: 5px;
        border-radius: 5px;
        position: absolute;
        z-index: 1; /* Set z-index to 1 */
        left: 10px;
        top: 100%;
        opacity: 0;
        transition: opacity 0.3s;
    }

    .tooltip:hover .tooltiptext {
        visibility: visible;
        opacity: 1;
        z-index: 9999; /* Set a high z-index value when hovering */
    }
    """

    nltk.download('averaged_perceptron_tagger')

    with gr.Blocks(
            css=css,
            title="Bounded Attention demo",
    ) as demo:
        description = """<p style="text-align: center; font-weight: bold;">
            <span style="font-size: 28px">Bounded Attention</span>
            <br>
            <span style="font-size: 18px" id="paper-info">
                [<a href="https://omer11a.github.io/bounded-attention/" target="_blank">Project Page</a>]
                [<a href="https://arxiv.org/abs/2403.16990" target="_blank">Paper</a>]
                [<a href="https://github.com/omer11a/bounded-attention" target="_blank">GitHub</a>]
            </span>
        </p>
        """
        gr.HTML(description)
        with gr.Column():
            prompt = gr.Textbox(
                label="Text prompt",
            )

            subject_token_indices = gr.Textbox(
                label="The token indices of each subject (separate indices for the same subject with commas, and for different subjects with semicolons)",
            )

            filter_token_indices = gr.Textbox(
                label="Optional: The token indices to filter, i.e. conjunctions, numbers, postional relations, etc. (if left empty, this will be automatically inferred)",
            )

            num_tokens = gr.Textbox(
                label="Optional: The number of tokens in the prompt (We use this to verify your input, as sometimes rare words are split into more than one token)",
            )

            with gr.Row():
                sketchpad = gr.Sketchpad(label="Sketch Pad", width=RESOLUTION, height=RESOLUTION)
                layout_image = gr.Image(type="pil", label="Bounding Boxes", interactive=False, width=RESOLUTION, height=RESOLUTION, scale=1)

            with gr.Row():
                clear_button = gr.Button(value='Clear')
                generate_layout_button = gr.Button(value='Generate layout')
                generate_image_button = gr.Button(value='Generate image')

            with gr.Row():
                out_images = gr.Gallery(type="pil", label="Generated Images", interactive=False)

            with gr.Accordion("Advanced Options", open=False):
                with gr.Column():
                    description = """
                        <div class="tooltip">Batch size &#9432
                        <span class="tooltiptext">The number of images to generate.</span>
                        </div>
                        <div class="tooltip">Initial step size &#9432
                        <span class="tooltiptext">The initial step size of the linear step size scheduler when performing guidance.</span>
                        </div>
                        <div class="tooltip">Final step size &#9432
                        <span class="tooltiptext">The final step size of the linear step size scheduler when performing guidance.</span>
                        </div>
                        <div class="tooltip">Number of self-attention clusters per subject &#9432
                        <span class="tooltiptext">Determines the number of clusters when clustering the self-attention maps (#clusters = #subject x #clusters_per_subject). Changing this value might improve semantics (adherence to the prompt), especially when the subjects exceed their bounding boxes.</span>
                        </div>
                        <div class="tooltip">Cross-attention loss scale factor &#9432
                        <span class="tooltiptext">The scale factor of the cross-attention loss term. Increasing it will improve semantic control (adherence to the prompt), but may reduce image quality.</span>
                        </div>
                        <div class="tooltip">Self-attention loss scale factor &#9432
                        <span class="tooltiptext">The scale factor of the self-attention loss term. Increasing it will improve layout control (adherence to the bounding boxes), but may reduce image quality.</span>
                        </div>
                        <div class="tooltip">Classifier-free guidance scale &#9432
                        <span class="tooltiptext">The scale factor of classifier-free guidance.</span>
                        </div>
                        <div class="tooltip" >Number of Gradient Descent iterations per timestep &#9432
                        <span class="tooltiptext">The number of Gradient Descent iterations for each timestep when performing guidance.</span>
                        </div>
                        <div class="tooltip" >Loss Threshold &#9432
                        <span class="tooltiptext">If the loss is below the threshold, Gradient Descent stops for that timestep. </span>
                        </div>
                        <div class="tooltip" >Number of guidance steps &#9432
                        <span class="tooltiptext">The number of timesteps in which to perform guidance.</span>
                        </div>
                    """
                    gr.HTML(description)
                    batch_size = gr.Slider(minimum=1, maximum=5, step=1, value=1, label="Number of samples (currently limited to one sample)")
                    init_step_size = gr.Slider(minimum=0, maximum=50, step=0.5, value=25, label="Initial step size")
                    final_step_size = gr.Slider(minimum=0, maximum=20, step=0.5, value=10, label="Final step size")
                    num_clusters_per_subject = gr.Slider(minimum=0, maximum=5, step=0.5, value=3, label="Number of clusters per subject")
                    cross_loss_scale = gr.Slider(minimum=0, maximum=2, step=0.1, value=1, label="Cross-attention loss scale factor")
                    self_loss_scale = gr.Slider(minimum=0, maximum=2, step=0.1, value=1, label="Self-attention loss scale factor")
                    classifier_free_guidance_scale = gr.Slider(minimum=0, maximum=50, step=0.5, value=7.5, label="Classifier-free guidance Scale")
                    num_iterations = gr.Slider(minimum=0, maximum=10, step=1, value=5, label="Number of Gradient Descent iterations")
                    loss_threshold = gr.Slider(minimum=0, maximum=1, step=0.1, value=0.2, label="Loss threshold")
                    num_guidance_steps = gr.Slider(minimum=10, maximum=20, step=1, value=15, label="Number of timesteps to perform guidance")
                    seed = gr.Slider(minimum=0, maximum=1000, step=1, value=445, label="Random Seed")

            boxes = gr.State([])

            clear_button.click(
                clear,
                inputs=[batch_size],
                outputs=[boxes, sketchpad, layout_image, out_images],
                queue=False,
            )

            generate_layout_button.click(
                draw,
                inputs=[sketchpad],
                outputs=[boxes, layout_image],
                queue=False,
            )

            generate_image_button.click(
                fn=generate,
                inputs=[
                    prompt, subject_token_indices, filter_token_indices, num_tokens,
                    init_step_size, final_step_size, num_clusters_per_subject, cross_loss_scale, self_loss_scale,
                    classifier_free_guidance_scale, batch_size, num_iterations, loss_threshold, num_guidance_steps,
                    seed,
                    boxes,
                ],
                outputs=[out_images],
                queue=True,
            )

        #with gr.Column():
        #    gr.Examples(
        #        examples=[
        #            [
        #                [[0.35, 0.4, 0.65, 0.9], [0, 0.6, 0.3, 0.9], [0.7, 0.55, 1, 0.85]],
        #                "3D Pixar animation of a cute unicorn and a pink hedgehog and a nerdy owl traveling in a magical forest",
        #                "7,8,17;11,12,17;15,16,17",
        #                "5,6,9,10,13,14,18,19",
        #                286,
        #            ],
        #        ],
        #        inputs=[boxes, prompt, subject_token_indices, filter_token_indices, seed],
        #        outputs=None,
        #        fn=None,
        #        cache_examples=False,
        #    )
        description = """<p> The source code of this demo is based on the <a href="https://huggingface.co/spaces/gligen/demo/tree/main">GLIGEN demo</a>.</p>"""
        gr.HTML(description)

    demo.launch(show_api=False, show_error=True)

if __name__ == '__main__':
    main()