🔍 AI Image Detector - Deep SVDD

One-Class Deep Learning Model for Detecting AI-Generated Images

📖 Model Description

This model detects AI-generated images using Deep Support Vector Data Description (SVDD), a one-class learning approach. It was trained exclusively on real images to learn what "real" looks like, allowing it to identify synthetic/AI-generated images as anomalies.

Key Features

• ✅ Enhanced Deep SVDD Architecture with channel attention mechanisms
• ✅ Trained on 35,000 real images from CIFAR-10 dataset
• ✅ L4 GPU Optimized with mixed precision training (16-bit)
• ✅ Advanced Augmentation: Mixup, multi-scale, contrastive learning
• ✅ Robust Evaluation: 70/15/15 train/val/test split with unseen test data

🎯 Performance Metrics

🚀 Quick Start

Installation

pip install torch torchvision pytorch-lightning huggingface-hub pillow

Basic Usage

import torch
from huggingface_hub import hf_hub_download
from PIL import Image
import torchvision.transforms as transforms

# Download model
model_path = hf_hub_download(
    repo_id="ash12321/ai-image-detector-deepsvdd",
    filename="model.ckpt"
)

# Load model (you'll need the model class definition)
from model import AdvancedDeepSVDD

model = AdvancedDeepSVDD.load_from_checkpoint(model_path)
model.eval()

# Prepare image
transform = transforms.Compose([
    transforms.Resize((32, 32)),
    transforms.ToTensor(),
    transforms.Normalize(
        mean=[0.4914, 0.4822, 0.4465],
        std=[0.2470, 0.2435, 0.2616]
    )
])

image = Image.open('test_image.jpg').convert('RGB')
image_tensor = transform(image).unsqueeze(0)

# Predict
is_fake, scores, distances = model.predict_anomaly(image_tensor)

print(f"AI-Generated: {is_fake[0].item()}")
print(f"Confidence: {scores[0].item()*100:.1f}%")
print(f"Anomaly Score: {scores[0].item():.4f}")

Using with Gradio

import gradio as gr

def predict(image):
    img_tensor = transform(image).unsqueeze(0)
    is_fake, scores, _ = model.predict_anomaly(img_tensor)
    
    result = "🚨 AI-Generated" if is_fake[0] else "✅ Real Image"
    confidence = f"{scores[0].item()*100:.1f}%"
    
    return f"**{result}** (Confidence: {confidence})"

demo = gr.Interface(
    fn=predict,
    inputs=gr.Image(type="pil"),
    outputs=gr.Markdown(),
    title="AI Image Detector"
)

demo.launch()

🏗️ Architecture Details

Enhanced Deep SVDD Encoder

Input (3x32x32) 
→ Stem Conv (64 channels)
→ Layer1 (64→128) + Channel Attention
→ Layer2 (128→256) + Channel Attention  
→ Layer3 (256→512) + Channel Attention
→ Dual Pooling (Avg + Max)
→ Projection Head (1024→512→128)
→ Output (128-dim latent space)

Training Optimizations

• Optimizer: AdamW (lr=1e-3, weight_decay=1e-3)
• Scheduler: OneCycleLR with cosine annealing
• Batch Size: 128 (L4 GPU optimized)
• Augmentation: Mixup (α=0.2), multi-scale, extensive transforms
• Loss: SVDD objective + contrastive diversity + L2 regularization

📊 Training Configuration

Model Parameters: 5.3M trainable
Epochs: 30
Training Samples: 35,000 (70%)
Validation Samples: 7,500 (15%)
Test Samples: 7,500 (15%)
Precision: 16-bit mixed precision
GPU: NVIDIA L4 with Tensor Cores

🎨 Data Augmentation Pipeline

Training Augmentations:

• Multi-scale resizing (32, 64, 96 pixels)
• Random resized crop (scale: 0.5-1.0)
• Random horizontal/vertical flips
• Random rotation (±20°)
• Color jitter (brightness, contrast, saturation, hue)
• Gaussian blur
• Random erasing
• Mixup augmentation

Validation/Test:

• Simple resize to 32x32
• Normalize with CIFAR-10 statistics

💡 Use Cases

• Content Moderation: Identify AI-generated images in uploads
• Digital Forensics: Verify authenticity of images
• Research: Study differences between real and synthetic images
• Education: Demonstrate one-class learning techniques

⚠️ Limitations

• Training Domain: Optimized for natural images similar to CIFAR-10
• Image Size: Trained on 32x32 images (resize larger images)
• Generalization: May require fine-tuning for specific domains
• False Positives: Unusual real images may be flagged as AI-generated
• Not Foolproof: Sophisticated AI images may evade detection

📚 Citation

If you use this model in your research, please cite:

@misc{ai-image-detector-deepsvdd-2024,
  author = {ash12321},
  title = {AI Image Detector using Deep SVDD},
  year = {2024},
  publisher = {Hugging Face},
  howpublished = {\url{https://huggingface.co/ash12321/ai-image-detector-deepsvdd}},
}

📄 License

This model is released under the MIT License.

🤝 Contributing

Contributions, issues, and feature requests are welcome!

👤 Author

ash12321

• Hugging Face: @ash12321

🙏 Acknowledgments

• CIFAR-10 dataset creators
• PyTorch Lightning team
• Deep SVDD paper authors
• Hugging Face for hosting infrastructure

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