Power-Efficient Double-Cyclic Low-Precision Training for Convolutional Neural Networks

Owing to the rapid development of deep learning, there has been a remarkable growth in the field of computer vision, including image classification. However, because recent deep learning models require many parameters and calculations, it is essential to reduce power consumption through weight reduction for practical use in embedded platforms, such as mobile devices. In particular, recent attempts to train deep learning models on edge/mobiles have been increasing to obtain customized models with user environments and to solve privacy issues. However, because batteries and hardware resources are limited in the edge/mobile environment, the need for low-precision training has increased. In this study, we propose a power-efficient double-cyclic low-precision training method that uses two different precision cycles for weights and activations during training. The results of verifying the proposed method in various ResNet models indicate an average accuracy improvement of 0.25% compared with the existing low-precision training method and an approximately 25% power reduction effect. Consequently, a 92.8% reduction in hardware resources is achieved with negligible performance degradation compared to full-precision training.