Evidence map›Paper›PMID 40903603›Full record

ReviewNature2025

Training of physical neural networks.

Ali Momeni, Babak Rahmani, Benjamin Scellier, Logan G Wright, Peter L McMahon, Clara C Wanjura, Yuhang Li, Anas Skalli, Natalia G Berloff, Tatsuhiro Onodera and 18 more

Abstract readReview
PubMed Publisher
In one paragraph

Review in Nature, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

26 citing papers in PubMed, 1 synthesis or guideline pooled it.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

28 authors.

Ali MomeniLaboratory of Wave Engineering, School of Electrical Engineering, Ècole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.ORCID 0000-0001-9707-8290
Babak RahmaniMicrosoft Research, Cambridge, UK.ORCID 0000-0002-0856-9635
Benjamin ScellierRain AI, San Francisco, CA, USA.ORCID 0000-0002-2407-7470
Logan G WrightDepartment of Applied Physics, Yale University, New Haven, CT, USA.
Peter L McMahonSchool of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.ORCID 0000-0002-1177-9887
Clara C WanjuraMax Planck Institute for the Science of Light, Erlangen, Germany.
Yuhang LiDepartment of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, CA, USA.ORCID 0000-0002-9364-4125
Anas SkalliUniversité Marie et Louis Pasteur, CNRS UMR 6174, Institut FEMTO-ST, 25000, Besançon, France.
Natalia G BerloffDepartment of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK.
Tatsuhiro OnoderaSchool of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.
Ilker OguzLaboratory of Applied Photonics Devices (LAPD), Ècole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.ORCID 0000-0003-2674-684X
Francesco MorichettiDipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy.ORCID 0000-0002-5858-2811
Philipp Del HougneUniversité de Rennes, CNRS, IETR - UMR 6164, Rennes, France.ORCID 0000-0002-4821-3924
Manuel Le GalloIBM Research Europe - Zurich, Rüschlikon, Switzerland.ORCID 0000-0003-1600-6151
Abu SebastianIBM Research Europe - Zurich, Rüschlikon, Switzerland.ORCID 0000-0001-5603-5243
Azalia MirhoseiniDepartment of Computer Science, Stanford University, Stanford, CA, USA.ORCID 0000-0002-2440-0944
Cheng ZhangMicrosoft Research, Cambridge, UK.
Danijela MarkovićUnité Mixte de Physique CNRS/Thales, CNRS, Thales, Université Paris-Saclay, Palaiseau, France.ORCID 0000-0001-7521-217X
Daniel BrunnerUniversité Marie et Louis Pasteur, CNRS UMR 6174, Institut FEMTO-ST, 25000, Besançon, France.ORCID 0000-0002-4003-3056
Christophe MoserLaboratory of Applied Photonics Devices (LAPD), Ècole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.ORCID 0000-0002-2078-0273
Sylvain GiganLaboratoire Kastler Brossel, Sorbonne Université, École Normale Supérieure, Collège de France, CNRS, Paris, France.ORCID 0000-0002-9914-6231
Florian MarquardtMax Planck Institute for the Science of Light, Erlangen, Germany.ORCID 0000-0003-4566-1753
Aydogan OzcanDepartment of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, CA, USA.ORCID 0000-0002-0717-683X
Julie GrollierLaboratoire Albert Fert, Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France.ORCID 0000-0003-4866-4490
Andrea J LiuDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, USA.ORCID 0000-0002-2295-2729
Demetri PsaltisOptics Laboratory (LO), Ècole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.ORCID 0000-0003-4684-8800
Andrea AlùPhotonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, USA.ORCID 0000-0002-4297-5274
Romain FleuryLaboratory of Wave Engineering, School of Electrical Engineering, Ècole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland. romain.fleury@epfl.ch.ORCID 0000-0002-9486-6854

Funding

European Union’s Horizon 2020 research and innovation programmeSwiss National Science FoundationWeizmann-UK Make Connection grant
6 · The paper itself

Abstract

Physical neural networks (PNNs) are a class of neural-like networks that make use of analogue physical systems to perform computations. Although at present confined to small-scale laboratory demonstrations, PNNs could one day transform how artificial intelligence (AI) calculations are performed. Could we train AI models many orders of magnitude larger than present ones? Could we perform model inference locally and privately on edge devices? Research over the past few years has shown that the answer to these questions is probably "yes, with enough research". Because PNNs can make use of analogue physical computations more directly, flexibly and opportunistically than traditional computing hardware, they could change what is possible and practical for AI systems. To do this, however, will require notable progress, rethinking both how AI models work and how they are trained-primarily by considering the problems through the constraints of the underlying hardware physics. To train PNNs, backpropagation-based and backpropagation-free approaches are now being explored. These methods have various trade-offs and, so far, no method has been shown to scale to large models with the same performance as the backpropagation algorithm widely used in deep learning today. However, this challenge has been rapidly changing and a diverse ecosystem of training techniques provides clues for how PNNs may one day be used to create both more efficient and larger-scale realizations of present-scale AI models.

Indexed as

Neural Networks, ComputerAlgorithmsArtificial IntelligenceDeep LearningMachine Learning

Identifiers

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.