open-eeg-bench 0.4.0

Benchmarking parameter-efficient fine-tuning of EEG foundation models

🧠 Open EEG Bench

Benchmark any EEG foundation model with one function call.

✨ Why Open EEG Bench?

• 🎯 One function, all results — Call benchmark() with your model and get a full evaluation across 12 datasets
• 📦 Zero preprocessing — All datasets are pre-windowed and hosted on HuggingFace Hub, ready to use
• ⚡ 8 fine-tuning strategies — Frozen linear probing, ridge probing, LoRA, IA3, AdaLoRA, DoRA, OFT, and full fine-tuning
• 🔌 Bring your own model — Any PyTorch model that takes EEG input and returns features works out of the box
• 🔒 Reproducible by design — A single config object fully describes a run. No YAML files, no hidden state

🚀 Installation

pip install open-eeg-bench

🏁 Benchmark your model

import open_eeg_bench as oeb

results = oeb.benchmark(
    model_cls="my_package.MyModel",  # import path to your model class
    checkpoint_url="https://my-weights.pth",
)

print(results)  # pd.DataFrame

This runs linear probing on all 12 datasets and returns a DataFrame with one row per result.

You can pick specific datasets, fine-tuning strategies, classification heads and number of initialization seeds:

results = oeb.benchmark(
    model_cls="my_package.MyModel",
    checkpoint_url="https://my-weights.pth",
    datasets=["arithmetic_zyma2019", "bcic2a", "physionet"],
    finetuning_strategies=["frozen", "lora"],
    peft_target_modules=[  # necessary for LoRA, IA3, AdaLoRA, OFT, and DoRA
        "encoder.linear1", 
        "encoder.linear2"
    ],
    heads=["linear_head", "mlp_head"],
    n_seeds=5,
)

Need to run on a SLURM cluster? No sbatch scripts needed — see Running on a cluster.

📐 Model requirements

Your model only needs to:

1. Accept input of shape (batch, n_chans, n_times)
2. Return output of shape (batch, n_outputs)
3. Have a named module for the classification head (default: self.final_layer)

⚙️ benchmark() parameters

Parameter	Required	Description
model_cls	Yes	Dotted import path to your model class
hub_repo	One of three	HuggingFace Hub repo ID for weights
checkpoint_url	One of three	URL to pretrained weights
checkpoint_path	One of three	Local path to pretrained weights
peft_target_modules	For PEFT	Module names to adapt (e.g. ["to_q", "to_k", "to_v"])
peft_ff_modules	For IA3	Feedforward module names for IA3 adapter
model_kwargs	No	Extra kwargs for the model constructor
head_module_name	No	Name of the head module (default: "final_layer")
normalization	No	Post-window normalization
datasets	No	Dataset names to evaluate on (default: all 12)
heads	No	Head names: "linear_head", "mlp_head", "original_head" (default: ["linear_head"])
finetuning_strategies	No	Strategy names: "frozen", "ridge_probe", "lora", "ia3", "adalora", "dora", "oft", "full_finetune", "two_stages" (default: ["frozen"])
n_seeds	No	Number of random seeds (default: 3)
device	No	"cpu", "cuda", etc. (default: "cpu")
infra	No	Infrastructure config for caching and cluster submission (see cluster docs)
max_workers	No	Max simultaneous SLURM jobs (default: 256)

📊 Available datasets

All 12 datasets are pre-windowed and hosted on HuggingFace Hub:

Dataset	HF ID	Classes	Window size	Task
Arithmetic (Zyma 2019)	braindecode/arithmetic_zyma2019	2	5 s	Mental arithmetic vs. rest
BCI Competition IV 2a	braindecode/bcic2a	4	4 s	Motor imagery
BCI Competition 2020-3	braindecode/bcic2020-3	5	3 s	Imagined speech
PhysioNet MI	braindecode/physionet	4	3 s	Motor imagery
CHB-MIT	braindecode/chbmit	2	10 s	Seizure detection
FACED	braindecode/faced	9	10 s	Emotion recognition
ISRUC-Sleep	braindecode/isruc-sleep	5	30 s	Sleep staging
MDD (Mumtaz 2016)	braindecode/mdd_mumtaz2016	2	5 s	Depression detection
SEED-V	braindecode/seed-v	5	1 s	Emotion recognition
SEED-VIG	braindecode/seed-vig	regression	8 s	Vigilance estimation
TUAB	braindecode/tuab	2	10 s	Abnormal EEG detection
TUEV	braindecode/tuev	6	5 s	EEG event classification

Preprocessing: Window lengths are dataset-dependant (see table above). All datasets are high-pass filtered at 0.1 Hz, except for tasks with short trial windows (2 s or less), where we use 0.5 Hz. All datasets are resampled to 100 Hz. Model-specific normalization (e.g. z-scoring) can be applied via the normalization parameter.

🧩 Available fine-tuning strategies

Strategy	Description	Trainable params
Frozen()	Freeze encoder, train only the head	~0.01%
"ridge_probe"	Closed-form ridge regression probing (no hyperparameter tuning needed)	~0.01%
LoRA(r, alpha)	Low-Rank Adaptation	~1-5%
IA3()	Inhibiting and Amplifying Inner Activations	~0.1%
AdaLoRA(r, target_r)	Adaptive rank allocation	~1-5%
DoRA(r, alpha)	Weight-Decomposed LoRA	~1-5%
OFT(block_size)	Orthogonal Fine-Tuning	~1-10%
FullFinetune()	Train all parameters	100%
TwoStages()	Frozen head for 10 epochs, then unfreeze and train all	100%

📄 License

BSD-3-Clause (see LICENSE.txt)

📣 Citation

If you use Open EEG Bench in your research, please cite it. Machine-readable metadata is provided in CITATION.cff — used by GitHub's "Cite this repository" button, reference managers, and Zenodo when archiving releases.

@software{open_eeg_bench,
  title     = {Open EEG Bench: Benchmarking parameter-efficient fine-tuning of EEG foundation models},
  author    = {Guetschel, Pierre and Aristimunha, Bruno and Truong, Dung and Kokate, Kuntal and Moreau, Thomas and Tangermann, Michael and Delorme, Arnaud},
  year      = {2026},
  url       = {https://github.com/braindecode/OpenEEGBench},
  doi       = {10.5281/zenodo.19698863}
}

📚 Further reading

• Running on a cluster — SLURM submission, infra options, caching, execution modes
• Running with Benchopt — Alternative CLI-based workflow using the Benchopt framework
• Advanced usage — Experiment class, architecture overview, braindecode integration
• Built-in backbones — Pretrained models shipped with the benchmark
• Contributing — How to add backbones, datasets, or fine-tuning strategies
• References — Citations and key libraries