On the automatic calibration of fully analogical spiking neuromorphic chips

Daniele M. Papetti, Simone Spolaor, Paolo Cazzaniga, Marco Antoniotti, Marco S. Nobile

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Nowadays, understanding the topology of biological neural networks and sampling their activity is possible thanks to various laboratory protocols that provide a large amount of experimental data, thus paving the way to accurate modeling and simulation. Neuromorphic systems were developed to simulate the dynamics of biological neural networks by means of electronic circuits, offering an efficient alternative to classic simulations based on systems of differential equations, from both the points of view of the energy consumed and the overall computational effort. Spikey is a configurable neuromorphic chip based on the Leaky Integrate-And-Fire model, which gives the user the possibility to model an arbitrary neural topology and simulate the temporal evolution of membrane potentials. To accurately reproduce the behavior of a specific biological network, a detailed parameterization of all neurons in the neuromorphic chip is necessary. Determining such parameters is a hard, error-prone, and generally time consuming task. In this work, we propose a novel methodology for the automatic calibration of neuromorphic chips that exploits a given neural activity as target. Our results show that, in the case of small networks with a low complexity, the method can estimate a vector of parameters capable of reproducing the target activity. Conversely, in the case of more complex networks, the simulations with Spikey can be highly affected by noise, which causes small variations in the simulations outcome even when identical networks are simulated, hindering the convergence to optimal parameterizations.
Original languageEnglish
Title of host publicationIEEE International Joint Conference on Neural Networks (IJCNN 2020)
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Publication statusAccepted/In press - Jun 2020

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    Papetti, D. M., Spolaor, S., Cazzaniga, P., Antoniotti, M., & Nobile, M. S. (Accepted/In press). On the automatic calibration of fully analogical spiking neuromorphic chips. In IEEE International Joint Conference on Neural Networks (IJCNN 2020) Institute of Electrical and Electronics Engineers.