Vowel recognition with four coupled spin-torque nano-oscillators
M. Romera,Philippe Talatchian,Sumito Tsunegi,Flavio Abreu Araujo,Flavio Abreu Araujo,Vincent Cros,Paolo Bortolotti,Juan Trastoy,Kay Yakushiji,Akio Fukushima,Hitoshi Kubota,Shinji Yuasa,Maxence Ernoult,Damir Vodenicarevic,Tifenn Hirtzlin,Nicolas Locatelli,Damien Querlioz,Julie Grollier +17 more
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TLDR
The results demonstrate that non-trivial pattern classification tasks can be achieved with small hardware neural networks by endowing them with nonlinear dynamical features such as oscillations and synchronization, and that the high experimental recognition rates stem from the ability of these oscillators to synchronize.Abstract:
Substantial evidence indicates that the brain uses principles of non-linear dynamics in neural processes, providing inspiration for computing with nanoelectronic devices. However, training neural networks composed of dynamical nanodevices requires finely controlling and tuning their coupled oscillations. In this work, we show that the outstanding tunability of spintronic nano-oscillators can solve this challenge. We successfully train a hardware network of four spin-torque nano-oscillators to recognize spoken vowels by tuning their frequencies according to an automatic real-time learning rule. We show that the high experimental recognition rates stem from the high frequency tunability of the oscillators and their mutual coupling. Our results demonstrate that non-trivial pattern classification tasks can be achieved with small hardware neural networks by endowing them with non-linear dynamical features: here, oscillations and synchronization. This demonstration is a milestone for spintronics-based neuromorphic computing.read more
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A comprehensive review on emerging artificial neuromorphic devices
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TL;DR: Robust mutual synchronization of two-dimensional SHNO arrays exposed to two independently tuned microwave frequencies exhibit the same synchronization maps as can be used for neuromorphic vowel recognition, and may in future enable neuromorphic computing on the nanoscale.
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