They used the tool in 2021 to look back over 60 years of AI research and pick out the 3,300 most influential papers by year and number of citations. One trend that jumped out was the shift from classical machine learning to deep neural networks, which underlie modern AI. A similar trend can be seen at NeurIPS, short for Neural Information Processing Systems, where the number of papers accepted was 50 times greater this year than in 1987 when the conference started.