‘Godfather of AI’ shares Nobel Prize in physics for work on machine learning

By Christian Edwards and Katie Hunt, CNN

(CNN) — The 2024 Nobel Prize in physics has been awarded to John Hopfield and Geoffrey Hinton for their fundamental discoveries in machine learning, which paved the way for how artificial intelligence is used today.

Hopfield, a professor at Princeton University and Hinton, a computer scientist at the University of Toronto, were praised for laying the foundations for the machine learning that powers many of today’s AI-based products and applications. Hinton, however, has also expressed fears about AI’s future development, cutting ties with his former employer Google in order to speak more freely on the issue.

“Their work was fundamental in laying the cornerstones for what we experience today as artificial intelligence,” Mark Pearce, a member of the Nobel committee of physics, told CNN.

The committee announced the prestigious honor, seen as the pinnacle of scientific achievement, in Sweden on Monday. The prize carries a cash award of 11 million Swedish kronor ($1 million).

Hinton, who has been dubbed the “godfather” of artificial intelligence (AI), said he was “flabbergasted” to receive the prize.

AI’s ‘huge influence’

Asked about the potential significance of the technology his research has helped to develop, he said AI will have a “huge influence” on our societies.

“It will be comparable with the industrial revolution. But instead of exceeding people in physical strength, it’s going to exceed people in intellectual ability. We have no experience of what it’s like to have things smarter than us,” he said in a phone interview immediately after the announcement.

Hinton predicted the technology would revolutionize things such as healthcare, leading to a “huge improvement in productivity.”

“But we also have to worry about a number of possible bad consequences, particularly the threat of these things getting out of control,” he cautioned.

“I am worried that the overall consequence of this might be systems more intelligent than us that eventually take control,” he added.

Thanks to the laureates’ work, AI has “become part of our daily lives,” from facial recognition to language translation, said Ellen Moons, chair of the Nobel Committee for physics.

“The laureates’ discoveries and inventions form the building blocks of machine learning that can aid in making faster and more reliable decisions, for instance when diagnosing medical conditions,” Moons said.

Michael Moloney, chief executive of the American Institute of Physics, told CNN that the Nobel Prize winners’ work had transformed science, allowing machine learning systems to process huge amounts of data and allow scientists to spot patterns they would not otherwise be able to see.

“People were very excited about these neural networks about 40 years ago… but we didn’t have the technology then to really implement and take advantage of the discoveries. It’s taken time and, now that we do, it’s really accelerated at an enormous rate.”

“Generative AI systems and machine learning systems are already transforming the search for exoplanets,” he said. “That’s just one of many examples.”

Mimicking the brain

AI has become shorthand for machine learning using artificial neural networks. This technology – developed by Hopfield and Hinton – is based on the structure of the brain.

Whereas a brain has neurons, an artificial neural network has nodes with different values. Whereas the brain’s neurons communicate with each other through synapses, artificial nodes influence each other through connections. You can train an artificial neural network by developing stronger connections between the nodes, just like you can train the brain.

Just as we can wrack our brains for a particular word or fact we rarely use and only dimly remember, artificial neural networks can also search back through the patterns it has saved – thanks to the invention of the Hopfield network in 1982.

“Hopfield was curious about whether it was possible to have a physical system which was inspired by the brain, a network of small computational neurons, which were connected together. He was curious whether it was possible to establish learning such a very simple system. And it was actually possible,” Pearce said.

After Hopfield published his research, Hinton expanded it using ideas from statistical physics and developed the earliest form of machine learning, called the “Boltzmann machine.”

“In particular, he (Hinton) demonstrated that it was possible to use the networks to find patterns in data,” Pearce added.

Since the 1980s, the networks have swelled in size. Whereas Hopfield used a network with just 30 nodes – with fewer than 500 parameters linking them – today’s networks, such as those used to power Chat GPT, can contain more than one trillion parameters.

Unlike traditional software, which is akin to following a recipe to bake a cake, an artificial neural network is able to learn by example – drawing on prior knowledge to create new recipes.

Whistleblower

As well as being an AI pioneer, Hinton has also urged caution around the technology. In May 2023, he left his role at Google and decided to “blow the whistle” after worrying about how smart it was becoming.

“I’m just a scientist who suddenly realized that these things are getting smarter than us,” Hinton told CNN last year. “I want to sort of blow the whistle and say we should worry seriously about how we stop these things getting control over us.”

He warned that AI “knows how to program so it’ll figure out ways of getting around restrictions we put on it. It’ll figure out ways of manipulating people to do what it wants.”

During Tuesday’s announcement ceremony, Hinton was asked whether he regrets his work to help create the technology he fears could cause great harm, despite its many potential benefits.

“There’s two kinds of regrets. There’s regrets where you feel guilty because you did something you knew you shouldn’t have done, and then there’s a regret where you did something that you would do again in the same circumstances, but it may in the end not turn out well,” Hinton said.

“That second kind of regret I have. In the same circumstances I would do the same again, but I am worried that the overall consequence of this might be systems more intelligent than us that eventually take control.”

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