Improving Classification Accuracy of Feedforward Neural Networks for Spiking Neuromorphic Chips

Improving Classification Accuracy of Feedforward Neural Networks for Spiking Neuromorphic Chips

Antonio Jimeno Yepes, Jianbin Tang, Benjamin Scott Mashford

Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence
Main track. Pages 1973-1979. https://doi.org/10.24963/ijcai.2017/274

Deep Neural Networks (DNN) achieve human level performance in many image analytics tasks but DNNs are mostly deployed to GPU platforms that consume a considerable amount of power. New hardware platforms using lower precision arithmetic achieve drastic reductions in power consumption. More recently, brain-inspired spiking neuromorphic chips have achieved even lower power consumption, on the order of milliwatts, while still offering real-time processing. However, for deploying DNNs to energy efficient neuromorphic chips the incompatibility between continuous neurons and synaptic weights of traditional DNNs, discrete spiking neurons and synapses of neuromorphic chips need to be overcome. Previous work has achieved this by training a network to learn continuous probabilities, before it is deployed to a neuromorphic architecture, such as IBM TrueNorth Neurosynaptic System, by random sampling these probabilities. The main contribution of this paper is a new learning algorithm that learns a TrueNorth configuration ready for deployment. We achieve this by training directly a binary hardware crossbar that accommodates the TrueNorth axon configuration constrains and we propose a different neuron model. Results of our approach trained on electroencephalogram (EEG) data show a significant improvement with previous work (76% vs 86% accuracy) while maintaining state of the art performance on the MNIST handwritten data set.
Keywords:
Machine Learning: Classification
Machine Learning: Machine Learning
Machine Learning: Neural Networks