Automatic discovery of resource-restricted Convolutional Neural Network topologies for myoelectric pattern recognition

Research output: Contribution to journalArticlepeer-review

Abstract

Convolutional Neural Networks (CNNs) have been subject to extensive attention in the pattern recognition literature due to unprecedented performance in tasks of information extraction from unstructured data. Whereas available methods for supervised training of a CNN with a given network topology are well-defined with rigorous theoretical justification, procedures for the initial selection of topology are currently not. Work incorporating selection of the CNN topology has instead substantially been guided by the domain-specific expertise of the creator(s), followed by iterative improvement via empirical evaluation. This limitation of methodology is restricting in the pursuit of naturally controlled muscle-computer interfaces, where CNNs have been identified as a promising research avenue but effective topology selection heuristics are lacking. With the goal of mitigating ambiguities in topology selection, this paper presents a systematic approach wherein we apply a novel evolutionary algorithm to search a space of candidate topologies. Furthermore, we constrain the search-space by excluding topologies with excessive inference-time computational complexity, making the obtained results implementable in embedded systems. In contrast to manual topology design, our algorithm requires the user to only specify a relatively small set of intuitive hyperparameters. To validate our approach, we use it in order to create topologies for myoelectric pattern recognition via movement decoding of surface electromyography signals. By collating offline classification accuracies obtained from experiments on a collection of publicly available databases, we demonstrate that our method generates computationally lightweight topologies with performance comparable to those of available alternatives.

Original languageEnglish
Article number103723
JournalComputers in Biology and Medicine
Volume120
DOIs
Publication statusPublished - 2020 May

Subject classification (UKÄ)

  • Bioinformatics (Computational Biology)

Keywords

  • Convolutional neural networks
  • Deep learning
  • Electromyography
  • Machine learning
  • Model selection
  • Muscle-computer interfaces
  • Myoelectric control
  • Myoelectric pattern recognition

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