Papers › InfoShape: Task-Based Neural Data Shaping via Mutual Information

InfoShape: Task-Based Neural Data Shaping via Mutual Information

26 Oct 2022arXiv:2210.15034links table onlyarchive 2025-07-28

Homa Esfahanizadeh, William Wu, Manya Ghobadi, Regina Barzilay, Muriel Medard

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The use of mutual information as a tool in private data sharing has remained an open challenge due to the difficulty of its estimation in practice. In this paper, we propose InfoShape, a task-based encoder that aims to remove unnecessary sensitive information from training data while maintaining enough relevant information for a particular ML training task. We achieve this goal by utilizing mutual information estimators that are based on neural networks, in order to measure two performance metrics, privacy and utility. Using these together in a Lagrangian optimization, we train a separate neural network as a lossy encoder. We empirically show that InfoShape is capable of shaping the encoded samples to be informative for a specific downstream task while eliminating unnecessary sensitive information. Moreover, we demonstrate that the classification accuracy of downstream models has a meaningful connection with our utility and privacy measures.

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