Table 2 . A summary of the architecture of the four pre-trained CNNs used.

CNN architecture	Number of layers	Input size	Output size
AlexNet	8	227 × 227	4,096 × 2
GoogleNet	22	224 × 224	1,024 × 2
ResNet-18	18	224 × 224	512 × 2
ShuffleNet	50	224 × 224	544 × 2