---
language:
- en
library_name: pytorch
license: mit
pipeline_tag: other
tags:
- sleep
- eeg
- polysomnography
- foundation-model
- self-supervised
- vit
- biosignals
---

# OSF: On Pre-training and Scaling of Sleep Foundation Models

This repository contains the weights for **OSF**, a family of sleep foundation models introduced in the paper [OSF: On Pre-training and Scaling of Sleep Foundation Models](https://huggingface.co/papers/2603.00190).

[![Paper](https://img.shields.io/badge/paper-arXiv-red)](https://huggingface.co/papers/2603.00190)
[![Webpage](https://img.shields.io/badge/website-demo-blue)](https://yang-ai-lab.github.io/osf/)
[![GitHub](https://img.shields.io/badge/github-code-black)](https://github.com/yang-ai-lab/OSF-Open-Sleep-FM)
[![License](https://img.shields.io/badge/license-MIT-green)](LICENSE)
[![Python](https://img.shields.io/badge/python-3.10%2B-brightgreen)](#installation)

## 🔥 News

- [2026-2-24] Our codebase and checkpoint is released. Full codebase for benchmarking will be public available after acceptance.
- [2026-2-22] Our paper is out.

## 📖 Introduction

Polysomnography (PSG) provides the gold standard for sleep assessment but suffers from substantial heterogeneity across recording devices and cohorts. OSF is a family of sleep foundation models (FMs) pre-trained on a massive corpus of 166,500 hours of sleep recordings from nine public sources. Leveraging the SleepBench benchmark, the authors establish an enhanced pre-training and scaling recipe that achieves state-of-the-art performance across diverse sleep and disease prediction tasks.

## 💿 Installation

```bash
git clone https://huggingface.co/yang-ai-lab/OSF-Base
cd OSF-Base
conda env create -f environment.yml
conda activate myenv
```

### Dependencies

- Python >= 3.10
- PyTorch >= 2.9.0
- PyTorch Lightning >= 2.5.5

## 🚀 Quick Start

We provide a demo notebook (`demo.ipynb`) demonstrating how to extract embeddings from PSG signals using the pretrained model.

```python
import torch
from osf.backbone.vit1d_cls import vit_base

# Load pretrained weights (included in this repo)
payload = torch.load("osf_backbone.pth", map_location="cpu", weights_only=False)
meta = payload["metadata"]

# Initialize model
backbone = vit_base(
    num_leads=meta["num_leads"],        # 12 channels
    seq_len=meta["seq_len"],            # 1920 (64 Hz × 30 s)
    patch_size=meta["patch_size_time"],
    lead_wise=meta["lead_wise"],
    patch_size_ch=meta["patch_size_ch"],
)
backbone.load_state_dict(payload["state_dict"])
backbone.eval()

# Extract embeddings
# x: [B, 12, 1920] - 12-channel PSG, 64 Hz × 30 seconds
with torch.no_grad():
    cls_embs, patch_embs = backbone.forward_encoding(x, return_sequence=False)
# cls_embs: [B, 768] - Global epoch-level representation
# patch_embs: [B, 90, 768] - Local patch representations
```

## 👩‍💻 Usage

### Input Format

Expected input format:
- **12 PSG Channels**: ECG, EMG_Chin, EMG_LLeg, EMG_RLeg, ABD, THX, NP, SN, EOG_E1_A2, EOG_E2_A1, EEG_C3_A2, EEG_C4_A1
- **Sample Rate**: 64 Hz
- **Epoch Length**: 30 seconds
- **Input Shape**: `[B, 12, 1920]`

### Pretraining and Fine-tuning

For detailed instructions on pretraining and fine-tuning using the OSF framework, please refer to the scripts in the [official GitHub repository](https://github.com/yang-ai-lab/OSF-Open-Sleep-FM).

## 📊 Benchmark Evaluations

OSF has been evaluated on the **SleepBench** benchmark across tasks such as Sleep Stage classification, Arousal detection, Hypopnea event detection, and Oxygen Desaturation detection, outperforming existing SSL methods like SleepFM, SimCLR, and DINO.

## 📝 Citation

If you use this code or models in your research, please cite the paper:

```bibtex
@article{shuai2026osf,
  title={OSF: On Pre-training and Scaling of Sleep Foundation Models},
  author={Shuai, Zitao and Xu, Zongzhe and Yang, David and Wang, Wei and Yang, Yuzhe},
  journal={arXiv preprint arXiv:2603.00190},
  year={2026}
}
```