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J.M. Portal (équipe Mémoires) nouvelle publication : "Powering AI at the edge: A robust, memristor-based binarized neural network with near-memory computing and miniaturized solar cell"


Fadi Jebali1, Atreya Majumdar 2, Clément Turck 2, Kamel-Eddine Harabi2, Mathieu-Coumba Faye1,3, Eloi Muhr 1, Jean-Pierre Walder1, Oleksandr Bilousov4,
Amadéo Michaud4, Elisa Vianello 3, Tifenn Hirtzlin3, François Andrieu3, Marc Bocquet1, Stéphane Collin 2,4, Damien Querlioz 2 & Jean-Michel Portal1



Memristor-based neural networks provide an exceptional energy-efficient platform for artificial intelligence (AI), presenting the possibility of self-powered operation when paired with energy harvesters. However, most memristor-based networks rely on analog in-memory computing, necessitating a stable and precise power supply, which is incompatible with the inherently unstable and unreliable energy harvesters. In this work, we fabricated a robust binarized neural network comprising 32,768 memristors, powered by a miniature wide-bandgap solar cell optimized for edge applications. Our circuit employs a resilient digital near-memory computing approach, featuring complementarily programmed memristors and logic-in-sense-amplifier. This design eliminates the need for compensation or calibration, operating effectively under diverse conditions. Under high illumination, the circuit achieves inference performance comparable to that of a lab bench power supply. In low illumination scenarios, it remains functional with slightly reduced accuracy, seamlessly transitioning to an approximate computing mode. Through image classification neural network simulations, we demonstrate that misclassified images under low illumination are primarily difficult-to-classify cases. Our approach lays the groundwork for self-powered AI and the creation of intelligent sensors for various applications in health, safety, and environment monitoring.

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