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Chapman-Shaoxing ECG Windows
Preprocessed from the Chapman-Shaoxing 12-lead ECG Database.
45,150 patients, 180,600 windows. Lead II, 128Hz, 4s windows (512 samples), 50% overlap.
| Split | Windows | Patients |
|---|---|---|
| Train | 126,420 | 31,605 |
| Val | 27,088 | 6,772 |
| Test | 27,092 | 6,773 |
Schema
| Column | Type | Description |
|---|---|---|
| patient_id | string | Record ID (e.g. JS00001) |
| record_id | string | Record + window index |
| window | list[float32] | 512-sample ECG (4s@128Hz, Lead II) |
| label_binary | int8 | 0=Normal, 1=AF |
| label_multi | int8 | 0=Normal,1=AF,2=CD,3=STTC,4=HYP,5=Other |
| all_superclasses | string | All superclass labels |
| snomed_codes | string | Original SNOMED-CT codes |
Preprocessing
- Extract Lead II (index 1) from 12-lead ECG
- Bandpass filter 0.5-8 Hz (Butterworth order 3)
- Resample 500 Hz -> 128 Hz
- Window: 4s (512 samples), 50% overlap
- Z-score normalize per window
- Patient-level stratified split (70/15/15, seed=42)
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