The first model we'll discuss is the winner of the 2012 ImageNet Large Scale Visual Recognition Challenge (ILSVRC, or simply ImageNet). It's nicknamed AlexNet (ImageNet Classification with Deep Convolutional Neural Networks, https://papers.nips.cc/paper/4824-imagenet-classification-with-deep-convolutional-neural-networks.pdf), after one of its authors, Alex Krizhevsky. Although this model is rarely used nowadays, it's an important milestone in contemporary deep learning.
The following diagram shows the network architecture: