Training an Ising machine with equilibrium propagation

Jérémie Laydevant (), Danijela Marković and Julie Grollier ()
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Jérémie Laydevant: Université Paris-Saclay
Danijela Marković: Université Paris-Saclay
Julie Grollier: Université Paris-Saclay

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Ising machines, which are hardware implementations of the Ising model of coupled spins, have been influential in the development of unsupervised learning algorithms at the origins of Artificial Intelligence (AI). However, their application to AI has been limited due to the complexities in matching supervised training methods with Ising machine physics, even though these methods are essential for achieving high accuracy. In this study, we demonstrate an efficient approach to train Ising machines in a supervised way through the Equilibrium Propagation algorithm, achieving comparable results to software-based implementations. We employ the quantum annealing procedure of the D-Wave Ising machine to train a fully-connected neural network on the MNIST dataset. Furthermore, we demonstrate that the machine’s connectivity supports convolution operations, enabling the training of a compact convolutional network with minimal spins per neuron. Our findings establish Ising machines as a promising trainable hardware platform for AI, with the potential to enhance machine learning applications.

Date: 2024
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DOI: 10.1038/s41467-024-46879-4

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