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arXiv · 2306.01457

Driving Context into Text-to-Text Privatization

Stefan Arnold·Dilara Yesilbas·Sven Weinzierl
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Abstract

\textit{Metric Differential Privacy} enables text-to-text privatization by adding calibrated noise to the vector of a word derived from an embedding space and projecting this noisy vector back to a discrete vocabulary using a nearest neighbor search. Since words are substituted without context, this mechanism is expected to fall short at finding substitutes for words with ambiguous meanings, such as \textit{'bank'}. To account for these ambiguous words, we leverage a sense embedding and incorporate a sense disambiguation step prior to noise injection. We encompass our modification to the privatization mechanism with an estimation of privacy and utility. For word sense disambiguation on the \textit{Words in Context} dataset, we demonstrate a substantial increase in classification accuracy by $6.05\%$.

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Stefan Arnold, Dilara Yesilbas, Sven Weinzierl. 2023-06-02. Driving Context into Text-to-Text Privatization. https://arxiv.org/abs/2306.01457

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