Restructuring Batch Normalization to Accelerate CNN Training

Wonkyung Jung; Daejin Jung; and Byeongho Kim; Sunjung Lee; Wonjong Rhee; Jung Ho Ahn

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arXiv · 1807.01702

Restructuring Batch Normalization to Accelerate CNN Training

Wonkyung Jung·Daejin Jung·and Byeongho Kim·Sunjung Lee·Wonjong Rhee·Jung Ho Ahn

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Abstract

Batch Normalization (BN) has become a core design block of modern Convolutional Neural Networks (CNNs). A typical modern CNN has a large number of BN layers in its lean and deep architecture. BN requires mean and variance calculations over each mini-batch during training. Therefore, the existing memory access reduction techniques, such as fusing multiple CONV layers, are not effective for accelerating BN due to their inability to optimize mini-batch related calculations during training. To address this increasingly important problem, we propose to restructure BN layers by first splitting a BN layer into two sub-layers (fission) and then combining the first sub-layer with its preceding CONV layer and the second sub-layer with the following activation and CONV layers (fusion). The proposed solution can significantly reduce main-memory accesses while training the latest CNN models, and the experiments on a chip multiprocessor show that the proposed BN restructuring can improve the performance of DenseNet-121 by 25.7%.

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Wonkyung Jung, Daejin Jung, and Byeongho Kim, Sunjung Lee, Wonjong Rhee, Jung Ho Ahn. 2018-07-04. Restructuring Batch Normalization to Accelerate CNN Training. https://arxiv.org/abs/1807.01702

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