The classification results from the hand-crafted era to ResNet — the winner of each year, plus VGG-16, which placed second in 2014 and is here because the section argues with it. Hover a point (or focus the plot and use ← →) for the numbers the axes cannot show: the parameter count, the depth, and what the system actually was. The bubble area carries whichever quantity the chips select — watch VGG and GoogLeNet swap places when you switch from parameters to layers, which is the whole argument of the section.