During the past ten years, the computing resources devoted to AI training models have exploded. After doubling every two years from 1960 to 2010, AI compute complexity has soared 10x every year. Just as important, AI training costs have dropped roughly 10x every year. In 2017, for example, the cost to train an image recognition network like ResNet-50 on a public cloud was ~$1,000. In 2019, the cost dropped to ~$10. At the current rate of improvement, the cost should fall to $1 by the end of this year.