[stared]

Various field of Deep Learning. Right now - Reinforcement Learning.

See: https://www.forbes.com/sites/louiscolumbus/2018/01/12/10-cha... or in general any other marker like NIPS submissions or arXiv preprints on DL.

Of course focus changes, and maybe in the next 2 years it will be on something different than RL. But still, even in Computer Vision it is still a very vibrant field, since its breakthrough in late 2012 (https://www.eff.org/ai/metrics). The majority of more traditional disciplines of CS had their breakthroughs a few decades ago.