Explainability of Neural Networks for Symbol Detection in Molecular Communication Channels

• Published in: IEEE transactions on molecular, biological, and multi-scale communications biological, and multi-scale communications, 2023-09, Vol.9 (3), p.1-1
• Main Authors: Gomez, Jorge Torres, Hofmann, Pit, Fitzek, Frank H.P., Dressler, Falko
• Format: Article
• Language: English
• Subjects: Artificial neural networks; Channel models; Channels; Detectors; Explainable AI; individual conditional expectation; local interpretable model-agnostic explanation; Machine learning; Mathematical models; molecular communication; neural network; Neural networks; Receivers; Symbols; testbed
• ISSN: 2372-2061; 2372-2061
• DOI: 10.1109/TMBMC.2023.3297135

Recent molecular communication (MC) research suggests machine learning (ML) models for symbol detection, avoiding the unfeasibility of end-to-end channel models. However, ML models are applied as black boxes, lacking proof of correctness of the underlying neural networks (NNs) to detect incoming symbols. This paper studies approaches to the explainability of NNs for symbol detection in MC channels. Based on MC channel models and real testbed measurements, we generate synthesized data and train a NN model to detect of binary transmissions in MC channels. Using the local interpretable model-agnostic explanation (LIME) method and the individual conditional expectation (ICE), the findings in this paper demonstrate the analogy between the trained NN and the standard peak and slope detectors.