Fig. 7From: Attention-based multi-scale features fusion for unobtrusive atrial fibrillation detection using ballistocardiogram signalStructure of the SAM layer. The MATMUL function is calculating the matrix multiplication, the ReLU function is used as the activation function and the Softmax function is utilized for training and normalization. The details of the calculation steps are listed in Formula (10)–(15)Back to article page