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README.md
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- neuroscience
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- braindecode
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- convolutional
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- transformer
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- sleep-staging
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---
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# ContraWR
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Contrast with the World Representation ContraWR from Yang et al (2021) .
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> **Architecture-only repository.**
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> `braindecode.models.ContraWR` class. **No pretrained weights are
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> distributed here**
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> data
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> separately.
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## Quick start
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The signal-shape arguments above are
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## Documentation
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<https://braindecode.org/stable/generated/braindecode.models.ContraWR.html>
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- Interactive browser with live instantiation:
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<https://huggingface.co/spaces/braindecode/model-explorer>
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- Source on GitHub: <https://github.com/braindecode/braindecode/blob/master/braindecode/models/contrawr.py#L10>
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## Architecture description
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The block below is the rendered class docstring (parameters,
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references, architecture figure where available).
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<div class='bd-doc'><main>
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<p>Contrast with the World Representation ContraWR from Yang et al (2021) [Yang2021]_.</p>
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<span style="display:inline-block;padding:2px 8px;border-radius:4px;background:#5cb85c;color:white;font-size:11px;font-weight:600;margin-right:4px;">Convolution</span>
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This model is a convolutional neural network that uses a spectral
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representation with a series of convolutional layers and residual blocks.
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The model is designed to learn a representation of the EEG signal that can
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be used for sleep staging.
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Parameters
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----------
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steps : int, optional
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Number of steps to take the frequency decomposition `hop_length`
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parameters by default 20.
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emb_size : int, optional
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Embedding size for the final layer, by default 256.
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res_channels : list[int], optional
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Number of channels for each residual block, by default [32, 64, 128].
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activation: nn.Module, default=nn.ELU
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Activation function class to apply. Should be a PyTorch activation
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module class like ``nn.ReLU`` or ``nn.ELU``. Default is ``nn.ELU``.
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drop_prob : float, default=0.5
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The dropout rate for regularization. Values should be between 0 and 1.
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.. versionadded:: 0.9
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Notes
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-----
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This implementation is not guaranteed to be correct, has not been checked
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by original authors. The modifications are minimal and the model is expected
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to work as intended. the original code from [Code2023]_.
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References
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----------
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.. [Yang2021] Yang, C., Xiao, C., Westover, M. B., & Sun, J. (2023).
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Self-supervised electroencephalogram representation learning for automatic
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sleep staging: model development and evaluation study. JMIR AI, 2(1), e46769.
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.. [Code2023] Yang, C., Westover, M.B. and Sun, J., 2023. BIOT
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Biosignal Transformer for Cross-data Learning in the Wild.
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GitHub https://github.com/ycq091044/BIOT (accessed 2024-02-13)
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.. rubric:: Hugging Face Hub integration
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When the optional ``huggingface_hub`` package is installed, all models
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automatically gain the ability to be pushed to and loaded from the
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Hugging Face Hub. Install with::
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pip install braindecode[hub]
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**Pushing a model to the Hub:**
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.. code::
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from braindecode.models import ContraWR
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# Train your model
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model = ContraWR(n_chans=22, n_outputs=4, n_times=1000)
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# ... training code ...
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# Push to the Hub
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model.push_to_hub(
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repo_id="username/my-contrawr-model",
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commit_message="Initial model upload",
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)
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**Loading a model from the Hub:**
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.. code::
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from braindecode.models import ContraWR
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# Load pretrained model
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model = ContraWR.from_pretrained("username/my-contrawr-model")
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# Load with a different number of outputs (head is rebuilt automatically)
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model = ContraWR.from_pretrained("username/my-contrawr-model", n_outputs=4)
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**Extracting features and replacing the head:**
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.. code::
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import torch
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x = torch.randn(1, model.n_chans, model.n_times)
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# Extract encoder features (consistent dict across all models)
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out = model(x, return_features=True)
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features = out["features"]
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# Replace the classification head
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model.reset_head(n_outputs=10)
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config = model.get_config() # all __init__ params
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with open("config.json", "w") as f:
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json.dump(config, f)
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saved to the Hub and restored when loading.
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See :ref:`load-pretrained-models` for a complete tutorial.</main>
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</div>
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## Citation
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*References* section above) and braindecode:
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```bibtex
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@article{aristimunha2025braindecode,
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- neuroscience
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- braindecode
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- convolutional
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- sleep-staging
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---
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# ContraWR
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Contrast with the World Representation ContraWR from Yang et al (2021) [Yang2021].
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> **Architecture-only repository.** Documents the
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> `braindecode.models.ContraWR` class. **No pretrained weights are
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> distributed here.** Instantiate the model and train it on your own
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> data.
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## Quick start
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)
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```
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The signal-shape arguments above are illustrative defaults — adjust to
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match your recording.
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## Documentation
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- Full API reference: <https://braindecode.org/stable/generated/braindecode.models.ContraWR.html>
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- Interactive browser (live instantiation, parameter counts):
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<https://huggingface.co/spaces/braindecode/model-explorer>
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- Source on GitHub: <https://github.com/braindecode/braindecode/blob/master/braindecode/models/contrawr.py#L10>
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## Parameters
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| Parameter | Type | Description |
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|---|---|---|
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| `steps` | int, optional | Number of steps to take the frequency decomposition `hop_length` parameters by default 20. |
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| `emb_size` | int, optional | Embedding size for the final layer, by default 256. |
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| `res_channels` | list[int], optional | Number of channels for each residual block, by default [32, 64, 128]. |
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| `activation: nn.Module, default=nn.ELU` | — | Activation function class to apply. Should be a PyTorch activation module class like `nn.ReLU` or `nn.ELU`. Default is `nn.ELU`. |
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| `drop_prob` | float, default=0.5 | The dropout rate for regularization. Values should be between 0 and 1. |
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| `.. versionadded:: 0.9` | — | — |
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## References
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1. Yang, C., Xiao, C., Westover, M. B., & Sun, J. (2023). Self-supervised electroencephalogram representation learning for automatic sleep staging: model development and evaluation study. JMIR AI, 2(1), e46769.
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2. Yang, C., Westover, M.B. and Sun, J., 2023. BIOT Biosignal Transformer for Cross-data Learning in the Wild. GitHub https://github.com/ycq091044/BIOT (accessed 2024-02-13)
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## Citation
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Cite the original architecture paper (see *References* above) and braindecode:
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```bibtex
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@article{aristimunha2025braindecode,
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