Drill the Cork of Information Bottleneck by Inputting the Most Important Data

• URL: http://arxiv.org/abs/2105.07181v1
• Date: Sat, 15 May 2021 09:20:36 GMT
• Title: Drill the Cork of Information Bottleneck by Inputting the Most Important Data
• Authors: Xinyu Peng, Jiawei Zhang, Fei-Yue Wang and Li Li
• Abstract summary: How to efficiently train deep neural networks remains to be solved. The information bottleneck (IB) theory claims that the optimization process consists of an initial fitting phase and the following compression phase. We show that the fitting phase depicted in the IB theory will be boosted with a high signal-to-noise ratio if the typicality sampling is appropriately adopted.
• Score: 28.32769151293851
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Deep learning has become the most powerful machine learning tool in the last decade. However, how to efficiently train deep neural networks remains to be thoroughly solved. The widely used minibatch stochastic gradient descent (SGD) still needs to be accelerated. As a promising tool to better understand the learning dynamic of minibatch SGD, the information bottleneck (IB) theory claims that the optimization process consists of an initial fitting phase and the following compression phase. Based on this principle, we further study typicality sampling, an efficient data selection method, and propose a new explanation of how it helps accelerate the training process of the deep networks. We show that the fitting phase depicted in the IB theory will be boosted with a high signal-to-noise ratio of gradient approximation if the typicality sampling is appropriately adopted. Furthermore, this finding also implies that the prior information of the training set is critical to the optimization process and the better use of the most important data can help the information flow through the bottleneck faster. Both theoretical analysis and experimental results on synthetic and real-world datasets demonstrate our conclusions.

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