Fig. 4.

(a) The proposed 3D multi-model ResNet (3DMM-ResNet), where the symbols “MP” and “GAP” represent the max pooling operation and the global average pooling operation, respectively. (b) The structural diagram of 3D residual block (3D-ResBlock) in which the symbols “m, n,” “BN,” and “PReLU” represent the number of channels, the batch normalization operation, and the nonlinear activation function, respectively. Besides, the input data and the 3D-ConvBlock are the same as described in Fig. 3