Evolution of plastic learning in spiking networks via memristive connections

Gerard Howard*, Ella Gale, Larry Bull, Ben De Lacy Costello, Andy Adamatzky

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

52 Citations (Scopus)

Abstract

This paper presents a spiking neuroevolutionary system which implements memristors as plastic connections, i.e., whose weights can vary during a trial. The evolutionary design process exploits parameter self-adaptation and variable topologies, allowing the number of neurons, connection weights, and interneural connectivity pattern to emerge. By comparing two phenomenological real-world memristor implementations with networks comprised of: 1) linear resistors, and 2) constant-valued connections, we demonstrate that this approach allows the evolution of networks of appropriate complexity to emerge whilst exploiting the memristive properties of the connections to reduce learning time. We extend this approach to allow for heterogeneous mixtures of memristors within the networks; our approach provides an in-depth analysis of network structure. Our networks are evaluated on simulated robotic navigation tasks; results demonstrate that memristive plasticity enables higher performance than constant-weighted connections in both static and dynamic reward scenarios, and that mixtures of memristive elements provide performance advantages when compared to homogeneous memristive networks.

Original languageEnglish
Article number6151103
Pages (from-to)711-729
Number of pages19
JournalIEEE Transactions on Evolutionary Computation
Volume16
Issue number5
DOIs
Publication statusPublished - 2012

Keywords

  • Genetic algorithms
  • Hebbian theory
  • memristors
  • neurocontrollers

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