A previous version of this article incorrectly construed the results of a survey asking machine learning researchers to estimate the probability that AI could end humanity. The median response was 10 percent, not 10 percent of respondents agreeing with the premise. This article has been corrected.
Inside Silicon Valley's AI sector, fierce divisions are growing over the impact of a new wave of artificial intelligence: While some argue it's imperative to race ahead, others say the technology presents an existential risk.