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Geoffrey Hinton harbors doubts about AI's current workhorse. (Johnny Guatto / University of Toronto)

In 1986, Geoffrey Hinton co-authored a paper that, three decades later, is central to the explosion of artificial intelligence. But Hinton says his breakthrough method should be dispensed with, and a new path to AI found.

Speaking with Axios on the sidelines of an AI conference in Toronto on Wednesday, Hinton, a professor emeritus at the University of Toronto and a Google researcher, said he is now "deeply suspicious" of back-propagation, the workhorse method that underlies most of the advances we are seeing in the AI field today, including the capacity to sort through photos and talk to Siri. "My view is throw it all away and start again," he said.

The bottom line: Other scientists at the conference said back-propagation still has a core role in AI's future. But Hinton said that, to push materially ahead, entirely new methods will probably have to be invented. "Max Planck said, 'Science progresses one funeral at a time.' The future depends on some graduate student who is deeply suspicious of everything I have said."

How it works: In back propagation, labels or "weights" are used to represent a photo or voice within a brain-like neural layer. The weights are then adjusted and readjusted, layer by layer, until the network can perform an intelligent function with the fewest possible errors.

But Hinton suggested that, to get to where neural networks are able to become intelligent on their own, what is known as "unsupervised learning," "I suspect that means getting rid of back-propagation."

"I don't think it's how the brain works," he said. "We clearly don't need all the labeled data."

Go deeper

Updated 1 hour ago - Politics & Policy

Pentagon approves request for 100 National Guard troops for "Justice for J6" rally

Security fencing has been reinstalled around the Capitol. Photo: Drew Angerer/Getty Images

Defense Secretary Lloyd Austin has approved a request from Capitol Police to provide 100 D.C. National Guard troops in case law enforcement requires additional support at Saturday's "Justice for J6" rally at the Capitol.

Why it matters: Security preparations have ramped up ahead of the pro-Trump demonstration, where hundreds of protesters sympathetic to the Jan. 6 Capitol attack are expected to gather.

Biden threatens new sanctions against Ethiopian officials over Tigray conflict

Photo: Al Drago/Getty Images

President Biden on Friday signed an executive order allowing the Treasury and State departments to impose sanctions against Ethiopian officials "responsible for, or complicit in, prolonging the conflict" in the Tigray region.

Driving the news: Hundreds of thousands of people are facing famine conditions in Tigray, but less than 10% of the needed humanitarian supplies has reached the region over the last month "due to the obstruction of aid access" by the Ethiopian government, according to Biden administration officials.

Top general: Calls to China were "perfectly within the duties" of job

Gen. Mark Milley. Photo: Andrew Harrer/Bloomberg via Getty Images

Joint Chiefs Chairman Mark Milley told the Associated Press on Friday that calls with his Chinese counterpart during the final months of Donald Trump's presidency were "perfectly within the duties and responsibilities" of his job.

Why it matters: In his first public comments on the calls that have prompted critics to question whether the general went too far, Milley maintained that such conversations are "routine," per AP.