Theory: the same mindset that caused Geoff Hinton to think it was "completely obvious" that radiologists would be unnecessary by 2021 (they are actually in high demand in 2023) also leads him to think AI is a serious existential risk.
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Geoff Hinton: On Radiology
Geoff Hinton comments on radiology and deep learning at the 2016 Machine Learning and Market for Intelligence Conference in Toronto