Abstract
In this work, we study network binarization (i.e., binary neural networks, BNNs), which is one of the most promising techniques in network compression for convolutional neural networks (CNNs). Although prior work has introduced many binarization methods that improve the accuracy of BNNs by minimizing the quantization error, there remains a non-negligible performance gap between the binarized model and the full-precision model. Given that feature representation is critical for deep neural networks and that in BNNs, the features only differ in signs, we argue that the impact on the accuracy of BNNs may be strongly related to the sign distribution of the network parameters in addition to the quantization error. To this end, Self-Distribution Binary Neural Network (SD-BNN) is proposed. First, we utilize Activation Self Distribution (ASD) to adaptively adjust the sign distribution of activations, thereby improving the sign differences of the outputs of the convolution. Second, we adjust the sign distribution of weights through Weight Self Distribution (WSD) and then fine-tune the sign distribution of the outputs of the convolution. Extensive experiments on the CIFAR-10 and ImageNet datasets with various network structures show that the proposed SD-BNN consistently outperforms state-of-the-art (SOTA) BNNs (e.g., 92.5% on CIFAR-10 and 66.5% on ImageNet with ResNet-18) with lower computational cost. Our code is available at https://github.com/pingxue-hfut/SD-BNN.
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Acknowledgments
This work was supported in part by the Anhui Provincial Key Research and Development Program under Grant 202004a05020040, in part by the National Key Research and Development Program under Grant 2018YFC0604404, in part by Intelligent Network and New Energy Vehicle Special Project of Intelligent Manufacturing Institute of HFUT under Grant IMIWL2019003, and in part by Fundamental Research Funds for the Central Universities under Grant PA2021GDGP0061.
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Xue, P., Lu, Y., Chang, J. et al. Self-distribution binary neural networks. Appl Intell 52, 13870–13882 (2022). https://doi.org/10.1007/s10489-022-03348-z
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DOI: https://doi.org/10.1007/s10489-022-03348-z