(Depends what you count; neural nets go back to the 40s, backprop to roughly the 1960s, etc, though transformers per se only 2017)
Neural Networks History: From 1940s to Transformers 2017
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(Depends what you count; neural nets go back to the 40s, backprop to roughly the 1960s, etc, though transformers per se only 2017)