Privately Detecting Changes in Unknown Distributions

ICML 2020

Privately Detecting Changes in Unknown Distributions

Jul 14, 2020
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"Privately Detecting Changes in Unknown Distributions" is work completed by Rachel Cummings, Sara Krehbiel, Yuliia Lut, and Wanrong Zhang at the Georgia Institute of Technology. This work was accepted to the 2020 International Conference on Machine Learning (ICML). Abstract: The change-point detection problem seeks to identify distributional changes in streams of data. Increasingly, tools for change-point detection are applied in settings where data may be highly sensitive and formal privacy guarantees are required, such as identifying disease outbreaks based on hospital records, or IoT devices detecting activity within a home. Differential privacy has emerged as a powerful technique for enabling data analysis while preventing information leakage about individuals. Much of the prior work on change-point detection---including the only private algorithms for this problem---requires complete knowledge of the pre-change and post-change distributions. However, this assumption is not realistic for many practical applications of interest. This work develops differentially private algorithms for solving the change-point problem when the data distributions are unknown. Additionally, the data may be sampled from distributions that change smoothly over time, rather than fixed pre-change and post-change distributions. We apply our algorithms to detect changes in the linear trends of such data streams. Finally, we also provide experimental results to empirically validate the performance of our algorithms. Full paper: https://arxiv.org/abs/1910.01327

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