The data set used in this paper is an online database provided by Physionet (https://physionet.org/physiobank/database/afpdb/), of which the atrial fibrillation paroxysmal database (AFPDB) is the most commonly used database in atrial fibrillation research. This database contains the ECG data of 50 normal people and 50 patients with paroxysmal atrial fibrillation. Each data report contains a 30-min record with no obvious episode of atrial fibrillation. In this study, the lead II ECG signal was used, and its sampling frequency was 128 Hz [15].
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