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Swapnaneel Bhattacharyya

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#machine learning Preprint Oct 2026

textGrain watermarking is harder to detect: can sum-tests still do it optimally?

Watermarking embeds an imperceptible signal in text from large language models that is statistically detectable with a secret key. The recent textGrain watermark (Li et. al. (2026b)) calibrates this signal against the model's sampling entropy through an explicit entropy budget, combining the stochasticity of Red-Green...

Swapnaneel Bhattacharyya, Soham Bonnerjee · 0 citations
Preprint Sep 2026

Change detection with conformal martingales: new optimal constructions, and suboptimality of existing methods

We study distribution-free sequential changepoint detection for independent observations with unknown and unrestricted pre- and post-change laws. We build on the conformal test martingales and associated e-detectors of Vovk(2021), which control the probability of false alarm (PFA) and the average run length (ARL) respe...

Swapnaneel Bhattacharyya, Aaditya Ramdas · 0 citations

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