Multi-Objective Optimisation of Cortical Spiking Neural Networks With Genetic Algorithms

James Fitzgerald, KongFatt Wong-Lin

Research output: Contribution to conferencePaperpeer-review

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Abstract

Spiking neural networks (SNNs) communicate through the all-or-none spiking activity of neurons. However, fitting the large number of SNN model parameters to observed neural activity patterns, for example, in biological experiments, remains a challenge. Previous work using genetic algorithm (GA) optimisation on a specific efficient SNN model, using the Izhikevich neuronal model, was limited to a single parameter and objective. This work applied a version of GA, called non-dominated sorting GA (NSGA-III), to demonstrate the feasibility of performing multi-objective optimisation on the same SNN, focusing on searching network connectivity parameters to achieve target firing rates of excitatory and inhibitory neuronal types, including across different network connectivity sparsity. We showed that NSGA-III could readily optimise for various firing rates. Notably, when the excitatory neural firing rates were higher than or equal to that of inhibitory neurons, the errors were small. Moreover, when connectivity sparsity was considered as a parameter to be optimised, the optimal solutions required sparse network connectivity. We also found that for excitatory neural firing rates lower than that of inhibitory neurons, the errors were generally larger. Overall, we have successfully demonstrated the feasibility of implementing multi-objective GA optimisation on network parameters of recurrent and sparse SNN.
Original languageEnglish
Number of pages6
Publication statusAccepted/In press - 30 Apr 2021
Event32nd Irish Signals and Systems Conference (ISSC) 2021 - Athlone Institute of Technology (AIT), Ireland
Duration: 10 Jun 202111 Jun 2021
https://www.issc.ie/

Conference

Conference32nd Irish Signals and Systems Conference (ISSC) 2021
CountryIreland
Period10/06/2111/06/21
Internet address

Keywords

  • Multi-objective parameter optimisation
  • genetic algorithm GA
  • NSGA-III
  • recurrent spiking neuronal network model
  • Izhikevich neuronal model

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