Mixed-Precision Quantization and Parallel Implementation of Multispectral Riemannian Classification for Brain-Machine Interfaces
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Date
2021
Publication Type
Conference Paper
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yes
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Abstract
With Motor-Imagery (MI) Brain-Machine Interfaces (BMIs) we may control machines by merely thinking of performing a motor action. Practical use cases require a wearable solution where the classification of the brain signals is done locally near the sensor using machine learning models embedded on energy-efficient microcontroller units (MCUs), for assured privacy, user comfort, and long-term usage. In this work, we provide practical insights on the accuracy-cost tradeoff for embedded BMI solutions. Our proposed Multispectral Riemannian Classifier reaches 75.1% accuracy on 4-class MI task. We further scale down the model by quantizing it to mixed-precision representations with a minimal accuracy loss of 1%, which is still 3.2% more accurate than the state-of-the- art embedded convolutional neural network. We implement the model on a low-power MCU with parallel processing units taking only 33.39 ms and consuming 1.304 mJ per classification. © 2021 IEEE
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published
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Book title
2021 IEEE International Symposium on Circuits and Systems (ISCAS)
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Pages / Article No.
9401564
Publisher
IEEE
Event
IEEE International Symposium on Circuits and Systems (ISCAS 2021)
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Software
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Subject
brain-machine interface; edge computing; parallel computing; machine learning; deep learning; motor imagery
Organisational unit
03996 - Benini, Luca / Benini, Luca