The research in CS is very active. Take a look at arXiv/cs to get a sense: https://arxiv.org/list/cs/recent https://arxiv.org/list/cs/recent I would say Machi

The research in CS is very active. Take a look at arXiv/cs to get a sense: https://arxiv.org/list/cs/recent https://arxiv.org/list/cs/recent I would say Machine Learning is particularly "hot" right now, with the anecdotal evidence being that many ML conferences (like NIPS, ICML, CVPR, etc) have been experiencing better than linear growth.