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Author

Zahra Ahmadi

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#machine learning Preprint Oct 2026

ChronoSheaf: Joint Spatio-Temporal Spectral Filtering on Cellular Sheaves

This work introduces a spectral sheaf Laplacian, defined jointly over space and time, such that a single operator regulates signal propagation across both the spatial graph and the temporal domain, and introduces ChronoSheaf, a spatio-temporal sheaf network with two key components.

A. Mostafa, Zahra Ahmadi · 0 citations
#machine learning Preprint Oct 2026

Hidden Data Challenges in Clinical Machine Learning

Widely reused preprocessing pipelines for electronic health records can encode assumptions about when information became available, what clinical episode a label represents, and what missingness means. These assumptions are rarely audited systematically and may propagate across subsequent studies when preprocessing pip...

Carolin Cissée, Dennis Fast, Raneen Younis et al. · 0 citations

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