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Variability-tolerant Convolutional Neural Network for Pattern Recognition applications based on OxRAM synapses

Abstract : Software implementations of artificial Convolutional Neural Networks (CNNs), taking inspiration from biology, are at the state-of-the-art for Pattern Recognition (PR) applications and they are successfully used in commercial products [1]. However, they require power-hungry CPU/GPU to perform convolution operations based on computationally expensive sums of multiplications. This hinders their integration in portable devices. Some full CMOS-based hardware implementations of CNN have been suggested, but they still require the computation of multiplications [2]. In this work, we present for the first time to our knowledge a spike-based hardware implementation of CNN using HfO2 based OxRAM devices as binary synapses. OxRAM devices are chosen for their low switching energy [3] and promising endurance performance [4]. We perform an experimental and theoretical study of the impact of programming conditions at both device and system levels. A complex visual pattern recognition application is demonstrated with a spike-based hierarchical CNN, inspired from the mammalian visual cortex organization. A high accuracy (pattern recognition rate >94%) is obtained for all the tested programming conditions, even if the variability associated to weaker programming conditions is larger.
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https://hal-cea.archives-ouvertes.fr/cea-01839848
Contributor : Léna Le Roy <>
Submitted on : Monday, July 16, 2018 - 10:05:29 AM
Last modification on : Monday, July 20, 2020 - 9:12:06 AM

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D. Garbin, O. Bichler, E. Vianello, Q. Rafhay, C. Gamrat, et al.. Variability-tolerant Convolutional Neural Network for Pattern Recognition applications based on OxRAM synapses. 2014 IEEE International Electron Devices Meeting, Dec 2014, San Francisco, United States. pp.28.4.1-28.4.4, ⟨10.1109/IEDM.2014.7047126⟩. ⟨cea-01839848⟩

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