Card: list the training data (datasets:, base_model:) and add a Training data section

Follow-up to braindecode PR #1493: `from_pretrained` reads `datasets:` into `model.card_data`. Ids: MOABB names, NEMAR nm/on ids, OpenNeuro ds ids; evidence per checkpoint.

README.md

@@ -6,9 +6,30 @@ tags:
 - braindecode
 - model_hub_mixin
 - pytorch_model_hub_mixin
+datasets:
+- TUEG
 ---
 
 This model has been pushed to the Hub using the [PytorchModelHubMixin](https://huggingface.co/docs/huggingface_hub/package_reference/mixins#huggingface_hub.PyTorchModelHubMixin) integration:
 - Code: https://braindecode.org
 - Paper: [More Information Needed]
-- Docs: https://braindecode.org/stable/generated/braindecode.models.CodeBrain.html
+- Docs: https://braindecode.org/stable/generated/braindecode.models.CodeBrain.html
+
+<!-- braindecode:training-data -->
+## Training data
+
+The data that shaped these weights. The ids are the `datasets:` field of this card,
+which braindecode reads into `model.card_data.datasets` when you call
+`from_pretrained` (MOABB class names for MOABB datasets, OpenNeuro / NEMAR
+accessions, Hub ids otherwise). `nm`/`on` ids are datasets on [NEMAR](https://nemar.org)
+(`on` = NEMAR's copy of the OpenNeuro dataset with the same number). Rows marked
+`private:` are data the authors did not release; they are not in `datasets:`.
+
+| `datasets:` id | Dataset | Stage | Modality |
+|---|---|---|---|
+| `TUEG` | [Temple University Hospital EEG Corpus (TUH EEG)](https://isip.piconepress.com/projects/nedc/html/tuh_eeg/) | pretraining | EEG |
+
+- stage 1 TFDual-Tokenizer (20 epochs) and stage 2 EEGSSM masked code prediction (10 epochs), both on TUEG; 19 ch, 200 Hz, 1,109,545 samples (~9,246 h); TUAB/TUEV not removed in the main model
+- `TUEG` (the TUH EEG Corpus) contains the recordings of its sub-corpora TUAB, TUEV, TUSZ, TUAR, TUSL and TUEP; an evaluation on one of those is not held out from these weights unless the authors removed it.
+- Sources: arXiv:2506.09110 Sec. 3.1 (Datasets, Pre-Training); arXiv:2506.09110 Appendix (TUAB/TUEV results); braindecode/models/codebrain.py (W/bd) _remap docstring; HF commit braindecode/codebrain-pretrained 2026-04-03.
+