# MeFEm: Medical Face Embedding Models

Vision Transformers pre-trained on face data for potential medical applications. Available in Small (MeFEm-S) and Base (MeFEm-B) sizes.

## Quick Start

```python
import torch
import timm

# Load model (MeFEm-S example)
model = timm.create_model(
    'vit_small_patch16_224',
    pretrained=False,
    num_classes=0,           # No classification head
    global_pool='token'      # Use CLS token (default)
)
model.load_state_dict(torch.load('mefem-s.pt'))
model.eval()

# Forward pass
x = torch.randn(1, 3, 224, 224)  # Your face image
embeddings = model(x)  # [1, 384] CLS token embeddings
```

## Model Details

- **Architecture**: ViT-Small/16 (384-dim) or ViT-Base/16 (768-dim) with CLS token
- **Training**: Modified I-JEPA on ~6.5M face images
- **Input**: Face crops with 2× expanded bounding boxes, 224×224 resolution
- **Output**: CLS token embeddings (`global_pool='token'`) or all tokens (`global_pool=''`)

## Usage Tips

```python
# For all tokens (CLS + patches):
model = timm.create_model('vit_small_patch16_224', num_classes=0, global_pool='')
tokens = model(x)  # [1, 197, 384]

# For patch embeddings only:
tokens = model.forward_features(x)
patch_embeddings = tokens[:, 1:]  # [1, 196, 384]
```

## Training Data

Face images from FaceCaption-15M, AVSpeech, and SHFQ datasets (~6.5M total). Images were cropped with expanded (2×) face bounding boxes.

## Notes

- Optimized for face images with loose cropping
- Intended for representation learning and transfer to medical tasks
- Results may vary for non-face or tightly-cropped images
- More info on training and metrics [here](https://arxiv.org/pdf/2602.14672)

## License

CC BY 4.0. Reference paper if used:
```
@misc{borets2026mefemmedicalfaceembedding,
      title={MeFEm: Medical Face Embedding model},
      author={Yury Borets and Stepan Botman},
      year={2026},
      eprint={2602.14672},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2602.14672},
}
```