Dr. Ruobing Chen Profile

Dr. Ruobing Chen

at Shanghai Jiao Tong Univ

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Proceedings Article | 15 March 2019 Paper

Deep convolutional neural networks compression method based on linear representation of kernels

Ruobing Chen, Yefei Chen, Jianbo Su

Proceedings Volume 11041, 110412N (2019) https://doi.org/10.1117/12.2522992

KEYWORDS: Convolutional neural networks, Convolution, Neural networks, Feature extraction, Distance measurement, Image compression, Machine vision

Read Abstract +

Convolutional Neural Networks (CNNs) are getting larger and deeper, and thus becoming harder to be deployed on systems with limited resources. Though convolutional filters benefit from the concept of receptive field, they still take up lots of resources to store these parameters in the large amounts of filters. Therefore, a compression method of pre-trained CNN models using "Linear Representation" of convolutional kernels is introduced in this paper. First, a codebook of template kernels "K_t". are generated by conducting unsupervised clustering on all convolutional kernels, with Pearson Correlation Coefficient set as distance. Then all the convolutional kernels are represented by the closest templates using linear fitting function a • K_t + b , which means that only two parameters and a codebook index are enough to represent a kernel. After that, the model is retrained with fixed template kernels and only two related parameters need to be finetuned for each kernel. Experiments show that convolutional kernels of a large CNN model can be represented using only a small amount of templates. Thus, this method can reach a compression rate of convolutional layers near 4×, with tiny impact on precision after retraining. Nevertheless, the proposed method can be performed with other compression approaches to get higher compression rate.

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