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Annual Review of Condensed Matter Physics

Volume 14, 2023

Learning Without Neurons in Physical Systems

Abstract

Learning is traditionally studied in biological or computational systems. The power of learning frameworks in solving hard inverse problems provides an appealing case for the development of physical learning in which physical systems adopt desirable properties on their own without computational design. It was recently realized that large classes of physical systems can physically learn through local learning rules, autonomously adapting their parameters in response to observed examples of use. We review recent work in the emerging field of physical learning, describing theoretical and experimental advances in areas ranging from molecular self-assembly to flow networks and mechanical materials. Physical learning machines provide multiple practical advantages over computer designed ones, in particular by not requiring an accurate model of the system, and their ability to autonomously adapt to changing needs over time. As theoretical constructs, physical learning machines afford a novel perspective on how physical constraints modify abstract learning theory.

Keyword(s): inverse design, learning theory, machine learning, metamaterials, molecular computing, physical learning, self-assembly
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2023-03-10
2024-06-13
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Learning Without Neurons in Physical Systems
Annual Review of Condensed Matter Physics 14, 417 (2023); https://doi.org/10.1146/annurev-conmatphys-040821-113439
/content/journals/10.1146/annurev-conmatphys-040821-113439
/content/journals/10.1146/annurev-conmatphys-040821-113439
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