🔄 GyroScope — Image Rotation Prediction

GyroScope is a ResNet-18 trained from scratch to detect whether an image is rotated by 0°, 90°, 180°, or 270° — and correct it automatically.

Is that photo upside down? Let GyroScope figure it out.

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🎯 Task

Given any image, GyroScope classifies its orientation into one of 4 classes:

Label	Meaning	Correction
0	0° — upright ✅	None
1	90° CCW	Rotate 270° CCW
2	180° — upside down	Rotate 180°
3	270° CCW (= 90° CW)	Rotate 90° CCW

Correction formula: correction = (360 − detected_angle) % 360

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📊 Benchmarks

Trained on 50,000 images from ImageNet-1k × 4 rotations = 200k training samples.
Validated on 5,000 images × 4 rotations = 20k validation samples.

Metric	Value
Overall Val Accuracy	79.81%%
Per-class: 0° (upright)	79.8%
Per-class: 90° CCW	80.1%
Per-class: 180°	79.4%
Per-class: 270° CCW	79.8%
Training Epochs	12
Training Time	~4h (Kaggle T4 GPU)

Training Curve

Epoch	Train Acc	Val Acc
1	41.4%	43.2%
2	52.0%	46.9%
3	59.4%	62.8%
4	64.1%	66.0%
5	67.8%	69.48%
6	70.6%	72.22%
7	73.3%	74.25%
8	75.6%	76.49%
9	77.5%	77.47%
10	79.1%	79.47%
11	80.3%	79.78%
12	80.9%	79.81%

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🏗️ Architecture

Detail	Value
Base	ResNet-18 (from scratch, no pretrained weights)
Parameters	11.2M
Input	224 × 224 RGB
Output	4 classes (0°, 90°, 180°, 270°)
Framework	🤗 Hugging Face Transformers (ResNetForImageClassification)

Training Details

• Optimizer: AdamW (lr=1e-3, weight_decay=0.05)
• Scheduler: Cosine annealing with 1-epoch linear warmup
• Loss: CrossEntropy with label smoothing (0.1)
• Augmentations: RandomCrop, ColorJitter, RandomGrayscale, RandomErasing
• ⚠️ No flips — horizontal/vertical flips would corrupt rotation labels
• Mixed precision: FP16 via torch.cuda.amp

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🚀 Quick Start

Installation

pip install transformers torch torchvision pillow requests

Inference — Single Image from URL

python3 use_with_UI.py

--> Download use_with_UI.py first 😄

💡 Example

Input (rotated 180°):

GyroScope Output: 📐 Recognized: 90° | Correction: 270° 📊 Probs: {'0°': '0.0257', '90°': '0.8706', '180°': '0.0735', '270°': '0.0300'}
Corrected:

Original Image Source: Link to Pexels

⚠️ Limitations

• Rotationally symmetric images (balls, textures, patterns) are inherently ambiguous — no model can reliably classify these.
• Trained on natural images (ImageNet). Performance may degrade on:
• Documents / text-heavy images
• Medical imaging
• Satellite / aerial imagery
• Abstract art

Only handles 90° increments — arbitrary angles (e.g. 45° or 135°) are not supported! Trained from scratch on 50k images — a pretrained backbone would likely yield higher accuracy (Finetuning).

📝 Use Cases

• 📸 Photo management — auto-correct phone/camera orientation
• 🗂️ Data preprocessing — fix rotated images in scraped datasets
• 🤖 ML pipelines — orientation normalization before feeding to downstream models
• 🖼️ Digital archives — batch-correct scanned/uploaded images

Yesterday, I was sorting photos and like every photo was rotated wrong! This inspired me to make this tool 😂

💻 Training code

The full training code can be found in train.py. Have fun 😊

📜 License

Apache 2.0

🙏 Acknowledgments

• Dataset: ILSVRC/ImageNet-1k
• Architecture: Microsoft ResNet via 🤗 Transformers
• Trained on Kaggle (Tesla T4 GPU)

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GyroScope — because every image deserves to stand upright.