Author

Parsa Rahimi

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#artificial intelligence Preprint Jun 2025

ScoreMix: Synthetic Data Generation by Score Composition in Diffusion Models Improves Recognition

This paper proposes ScoreMix, a self-contained synthetic generation method to produce hard synthetic samples for recognition tasks by leveraging the score compositionality of diffusion models, and finds that mixing classes distant in the discriminator's embedding space yields larger gains, compared to selection based o...

Parsa Rahimi, Sébastien Marcel · 0 citations

Preprint Jul 2026

ScoreShield: Differentially Private Release of Similarity Scores

A perturb-then-project mechanism that adds Gaussian noise calibrated to global sensitivity of the chosen score release regime and then projects the result onto the feasibility set of valid cosine objects, and evaluates the mechanism across RAG, face recognition, semantic retrieval, image similarity, and recommender-sys...

Behrooz Razeghi, Parsa Rahimi · 0 citations