app.py

import gradio as gr
import numpy as np
import torch
import random
from PIL import Image
from skimage.feature import graycomatrix, graycoprops
from torchvision import transforms
import os

NUM_ROUNDS = 10
PROB_THRESHOLD = 0.3

# Load the model
model = torch.jit.load("SuSy.pt")

def process_image(image):
    # Set Parameters
    top_k_patches = 5
    patch_size = 224

    # Get the image dimensions
    width, height = image.size

    # Calculate the number of patches
    num_patches_x = width // patch_size
    num_patches_y = height // patch_size

    # Divide the image in patches
    patches = np.zeros((num_patches_x * num_patches_y, patch_size, patch_size, 3), dtype=np.uint8)
    for i in range(num_patches_x):
        for j in range(num_patches_y):
            x = i * patch_size
            y = j * patch_size
            patch = image.crop((x, y, x + patch_size, y + patch_size))
            patches[i * num_patches_y + j] = np.array(patch)

    # Compute the most relevant patches
    dissimilarity_scores = []
    for patch in patches:
        transform_patch = transforms.Compose([transforms.PILToTensor(), transforms.Grayscale()])
        grayscale_patch = transform_patch(Image.fromarray(patch)).squeeze(0)
        glcm = graycomatrix(grayscale_patch, [5], [0], 256, symmetric=True, normed=True)
        dissimilarity_scores.append(graycoprops(glcm, "contrast")[0, 0])

    # Sort patch indices by their dissimilarity score
    sorted_indices = np.argsort(dissimilarity_scores)[::-1]

    # Extract top k patches and convert them to tensor
    top_patches = patches[sorted_indices[:top_k_patches]]
    top_patches = torch.from_numpy(np.transpose(top_patches, (0, 3, 1, 2))) / 255.0

    # Predict patches
    model.eval()
    with torch.no_grad():
        preds = model(top_patches)

    # Process results
    classes = ['Authentic', 'DALL·E 3', 'Stable Diffusion 1.x', 'MJ V5/V6', 'MJ V1/V2', 'Stable Diffusion XL']
    mean_probs = preds.mean(dim=0).numpy()
    
    # Create a dictionary of class probabilities
    class_probs = {cls: prob for cls, prob in zip(classes, mean_probs)}
    
    # Sort probabilities in descending order
    sorted_probs = dict(sorted(class_probs.items(), key=lambda item: item[1], reverse=True))

    return sorted_probs

def resize_image(image, max_size=512):
    """Resize image to have a maximum dimension of max_size while preserving aspect ratio"""
    width, height = image.size
    if width > height:
        if width > max_size:
            new_width = max_size
            new_height = int(height * (max_size / width))
    else:
        if height > max_size:
            new_height = max_size
            new_width = int(width * (max_size / height))
        else:
            return image
    return image.resize((new_width, new_height), Image.Resampling.LANCZOS)

class GameState:
    def __init__(self):
        self.user_score = 0
        self.model_score = 0
        self.current_round = 0
        self.total_rounds = NUM_ROUNDS
        self.game_images = []
        self.is_game_active = False
        self.last_results = None
        self.waiting_for_input = True
        self.original_image = None

    def reset(self):
        self.__init__()

game_state = GameState()

def load_images():
    real_image_folder = "real_images"
    fake_image_folder = "fake_images"
    real_images = [os.path.join(real_image_folder, img) for img in os.listdir(real_image_folder)]
    fake_images = [os.path.join(fake_image_folder, img) for img in os.listdir(fake_image_folder)]
    selected_images = random.sample(real_images, NUM_ROUNDS // 2) + random.sample(fake_images, NUM_ROUNDS // 2)
    random.shuffle(selected_images)
    return selected_images

def create_score_html():
    results_html = ""
    if game_state.last_results:
        results_html = f"""
        <div style='margin-top: 1rem; padding: 1rem; background-color: #e0e0e0; border-radius: 8px; color: #333;'>
            <h4 style='color: #333; margin-bottom: 0.5rem;'>Last Round Results:</h4>
            <p style='color: #333;'>Your guess: {game_state.last_results['user_guess']}</p>
            <p style='color: #333;'>Model's guess: {game_state.last_results['model_guess']}</p>
            <p style='color: #333;'>Correct answer: {game_state.last_results['correct_answer']}</p>
        </div>
        """

    current_display_round = min(game_state.current_round + 1, game_state.total_rounds)
    
    return f"""
    <div style='padding: 1rem; background-color: #f0f0f0; border-radius: 8px; color: #333;'>
        <h3 style='margin-bottom: 1rem; color: #333;'>Score Board</h3>
        <div style='display: flex; justify-content: space-around;'>
            <div>
                <h4 style='color: #333;'>You</h4>
                <p style='font-size: 1.5rem; color: #333;'>{game_state.user_score}</p>
            </div>
            <div>
                <h4 style='color: #333;'>AI Model</h4>
                <p style='font-size: 1.5rem; color: #333;'>{game_state.model_score}</p>
            </div>
        </div>
        <div style='margin-top: 1rem;'>
            <p style='color: #333;'>Round: {current_display_round}/{game_state.total_rounds}</p>
        </div>
        {results_html}
    </div>
    """

def start_game():
    game_state.reset()
    game_state.game_images = load_images()
    game_state.is_game_active = True
    game_state.waiting_for_input = True
    
    # Store original image and create resized version for display
    game_state.original_image = Image.open(game_state.game_images[0])
    display_image = resize_image(game_state.original_image)
    
    return (
        gr.update(value=display_image, visible=True),  # Show resized image
        gr.update(visible=False),  # Hide start button
        gr.update(visible=True, interactive=True),  # Show Real button
        gr.update(visible=True, interactive=True),  # Show Fake button
        create_score_html(),
        gr.update(visible=False)  # Hide feedback
    )

def submit_guess(user_guess):
    if not game_state.is_game_active or not game_state.waiting_for_input:
        return [gr.update()] * 6

    model_prediction = process_image(game_state.original_image)
    correct_answer = "Real" if "real_images" in game_state.game_images[game_state.current_round] else "Fake"
    
    # Determine model's guess based on probabilities
    model_guess = "Real" if model_prediction['Authentic'] > PROB_THRESHOLD else "Fake"
    
    # Update scores
    if user_guess == correct_answer:
        game_state.user_score += 1
    if model_guess == correct_answer:
        game_state.model_score += 1
    
    # Store last results for display
    game_state.last_results = {
        'user_guess': user_guess,
        'model_guess': model_guess,
        'correct_answer': correct_answer
    }
    
    game_state.current_round += 1
    game_state.waiting_for_input = True
    
    # Check if game is over
    if game_state.current_round >= game_state.total_rounds:
        game_state.is_game_active = False
        return (
            gr.update(value=None, visible=False),
            gr.update(visible=True),
            gr.update(visible=False),
            gr.update(visible=False),
            create_score_html(),
            gr.update(visible=True, value="<div style='text-align: center; margin-top: 20px; font-size: 1.2em;'>Game Over! Click 'Start New Game' to play again.</div>")
        )

    # Continue to next round
    game_state.original_image = Image.open(game_state.game_images[game_state.current_round])
    display_image = resize_image(game_state.original_image)
    
    return (
        gr.update(value=display_image, visible=True),
        gr.update(visible=False),
        gr.update(visible=True, interactive=True),
        gr.update(visible=True, interactive=True),
        create_score_html(),
        gr.update(visible=False)
    )

# Custom CSS
custom_css = """
#game-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
#start-button {
    max-width: 200px;
    margin: 0 auto;
}
#guess-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}
.guess-button {
    min-width: 120px;
}
"""

# Define Gradio interface
with gr.Blocks(css=custom_css) as iface:
    with gr.Column(elem_id="game-container"):
        gr.HTML("""
            <table style="border-collapse: collapse; border: none; padding: 20px;">
            <tr style="border: none;">
                <td style="border: none; vertical-align: top; padding-right: 30px; padding-left: 30px;">
                <img src="https://cdn-uploads.huggingface.co/production/uploads/62f7a16192950415b637e201/NobqlpFbFkTyBi1LsT9JE.png" alt="SuSy Logo" width="120" style="margin-bottom: 10px;">
                </td>
                <td style="border: none; vertical-align: top; padding: 10px;">
                <p style="margin-bottom: 15px;">Compete against SuSy to spot AI-Generated images! SuSy can distinguish between authentic images and those generated by DALL·E, Midjourney and Stable Diffusion.</p>
                <p style="margin-top: 15px;">Learn more about SuSy: <a href="https://arxiv.org/abs/2409.14128">Present and Future Generalization of Synthetic Image Detectors</a></p>
                <p style="margin-top: 15px;">
                    Enter the SuSy-verse!
                    <a href="https://huggingface.co/HPAI-BSC/SuSy">Model</a> |
                    <a href="https://github.com/HPAI-BSC/SuSy">Code</a> |
                    <a href="https://huggingface.co/datasets/HPAI-BSC/SuSy-Dataset">Dataset</a>
                </p>
                </td>
            </tr>
            </table>
        """)
        
        with gr.Row():
            with gr.Column(scale=2):
                image_display = gr.Image(
                    type="pil",
                    label="Current Image",
                    interactive=False,
                    visible=False
                )
            
            with gr.Column(scale=1):
                score_display = gr.HTML()
                with gr.Row(elem_id="guess-buttons"):
                    real_button = gr.Button(
                        "Real",
                        visible=False,
                        variant="primary",
                        elem_classes=["guess-button"]
                    )
                    fake_button = gr.Button(
                        "Fake",
                        visible=False,
                        variant="secondary",
                        elem_classes=["guess-button"]
                    )
        
        with gr.Row():
            with gr.Column(elem_id="start-button"):
                start_button = gr.Button("Start New Game", variant="primary", size="sm")
        
        feedback_display = gr.Markdown(visible=False)
        
        # Event handlers
        start_button.click(
            fn=start_game,
            outputs=[
                image_display,
                start_button,
                real_button,
                fake_button,
                score_display,
                feedback_display
            ]
        )
        
        real_button.click(
            fn=lambda: submit_guess("Real"),
            outputs=[
                image_display,
                start_button,
                real_button,
                fake_button,
                score_display,
                feedback_display
            ]
        )
        
        fake_button.click(
            fn=lambda: submit_guess("Fake"),
            outputs=[
                image_display,
                start_button,
                real_button,
                fake_button,
                score_display,
                feedback_display
            ]
        )

# Launch the interface
iface.launch()