wi-lab/lwm-competition-2025

⚡ LARGE WIRELESS MODELS (LWMs) 2025 CHALLENGE

The goal is to improve performance across five wireless downstream tasks by optimizing a baseline LWM and/or designing new downstream models

Challenge Overview • Provided Materials • Getting Started • Submission Process • Tutorials • Citation • Community & Support • Team

 

 

📡 Large Wireless Model (LWM) Challenge

Welcome to the official repository of the LWM 2025 Challenge, a competition designed to advance the state of foundation models in wireless communications and sensing. Participants are invited to optimize a provided baseline Large Wireless Model (LWM) and design downstream models to tackle five core wireless tasks with limited labeled data.

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🧠 About LWM

Large Wireless Model (LWM) 1.1 is a Transformer-based foundation model pre-trained using self-supervised learning on over 1 million unlabeled wireless channel samples. It generates rich, task-agnostic embeddings that significantly outperform raw channel representations on downstream tasks—especially when data is scarce or noisy or downstream models need to be simple.

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🏁 Challenge Overview

Participants are given:

• A pre-trained LWM 1.1 checkpoint
• Baseline downstream task models
• Training, validation, and public test sets for each task
• Helper functions and templates

Your goal is to improve the Composite Generalization Score (CG-Score) across these five tasks:

1. LoS/NLoS Classification – F1-score
2. Sub-6 GHz Channel to mmWave Beam Prediction – Top-1 Beam F1-score
3. Channel Interpolation – Normalized MSE
4. Channel Estimation – Normalized MSE
5. Localization – Normalized Localization Error

Final rankings are based on hidden test sets evaluated by the organizers.

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📦 Provided Materials

This repository contains:

• pretrained_model.py — Loads the baseline or your refined LWM model
• train_heads.py — The main script for training and evaluating all task-specific models. This file must not be modified. It is provided as a standardized template to ensure fairness and consistency across all teams. Participants must design their submissions to align with this script. The organizers will use an equivalent version of train_heads.py for final evaluation, and any deviation from the expected structure will result in automatic disqualification.
• train_heads_config.py — Contains training configs and model head definitions
• train_lwm.py — Contains LWM 1.1 pre-training and dataset reproducibility script
• utils.py — Helper functions (training, scoring, data handling)
• task_{t}/ — Contains the training, validation, and public test sets for each downstream task. These datasets are used for jointly fine-tuning your refined LWM and training the corresponding task-specific models. While downstream training is restricted to the provided datasets, you are free to use any dataset for LWM pre-training. Participants are granted early access to the DeepMIMO v4 dataset, which offers new, large-scale scenarios suitable for extended LWM refinement.
• requirements.yml — Conda environment file for dependency setup

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🚀 Getting Started

📥 Clone the repo

git clone https://huggingface.co/wi-lab/lwm-competition-2025
cd lwm-competition-2025

🛠️ Set up the environment

conda env create -f requirements.yml
conda activate lwm_env

🧪 Run baseline pipeline

python train_heads.py

This jointly finetunes LWM and trains downstream heads, evaluates on public test sets, and creates a submission ZIP file.

🧩 Submission Process

1. Refine your LWM or downstream heads
2. Update pretrained_model.py, train_heads_config.py, and utils.py.
3. Run:

python train_heads.py

4. Submit the generated ZIP file to the competition portal

🛑 Do not modify train_heads.py. While you may adapt it for local development or experimentation, your final submission must be fully compatible with the original, unmodified version provided. The evaluation script used by the organizers assumes this exact structure—any deviation may result in disqualification.

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📚 Tutorials

Visit the official tutorials page:

👉 https://lwm-wireless.net/tutorials

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🧪 Citation

If you use the LWM model or its components, please cite:

@misc{alikhani2025largewirelessmodellwm,
      title={Large Wireless Model (LWM): A Foundation Model for Wireless Channels}, 
      author={Sadjad Alikhani and Gouranga Charan and Ahmed Alkhateeb},
      year={2025},
      eprint={2411.08872},
      archivePrefix={arXiv},
      primaryClass={cs.IT},
      url={https://arxiv.org/abs/2411.08872}, 
}

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👥 Community & Support

• 💬 Discussion Forum
• 📨 Contact: [email protected]

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👨‍🔬 Team

Developed by the Wireless Intelligence Lab at Arizona State University.