feat: add PTBXLDataset and PTBXLMultilabelClassification task#2

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anuragd-UIUC wants to merge 10 commits intojtwells2:masterfrom

anuragd-UIUC:feature_anuragd2/ptbxl-dataset-and-task

Commits on Apr 19, 2026

feat: add PTBXLDataset and PTBXLMultilabelClassification task
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update: adapt notebook to jtwells2 CinC 2020 ptbxl format (SNOMED-CT labels)
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refactor: align notebook with jtwells2's PTBXLMultilabelClassification design
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feature: add BiLSTMECG and SE-ResNet ECG models with pipeline notebooks
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moved SEResNetECG to pyhealth/models/ and export from _init__
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Align task with load_data() columns and split task tests into test_ptbxl_task
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remove: delete ptbxl.yaml config (superseded by load_data() pipeline)
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remove: delete cs598_project tracked files from PR (jtwells2 review)
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fix: use comma separator for dx_codes (matches ptbxl.py load_data)
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remove: move ECG models to feature_anuragd2/ecg-models branch (jtwells2 review)
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