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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

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50 mins ago - Technology

Epic's long game against Apple

Illustration: Sarah Grillo/Axios

Epic's Apple lawsuit is costing the company dearly, but the game developer has its eye on a valuable long-term goal: prying tomorrow's virtual worlds loose from the grip of app store proprietors like Apple.

Between the lines: Epic isn't spending a fortune in legal fees and foregoing a ton of revenue just to shave some costs off in-app purchases on today's phones. Rather, it's planning for a future of creating virtual universes via augmented and virtual reality — without having to send a big chunk of their economies to Apple or Google.

Updated 55 mins ago - Health

The race to avoid a possible "monster" COVID variant

Illustration: Rae Cook/Axios

Slow global COVID-19 vaccination rates are raising concerns that worse variants of the coronavirus could be percolating, ready to rip into the world before herd immunity can diminish their impact.

Why it matters: The U.S. aims to at least partially vaccinate 70% of adults by July 4, a move expected to accelerate the current drop of new infections here. But variants are the wild card, and in a global pandemic where only about 8% of all people have received one dose, the virus will continue mutating unabated.

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Illustration: Rae Cook/Axios

Democrats have no workable plan to tackle the cost of prescription drugs, even with full control of Washington and after campaigning on the issue for years.

The picture: Voters still care about the cost of drugs, but Democrats don't have a feasible legislative strategy yet — or an agreed-upon policy to fit into a legislative strategy.