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Sergio Barbarossa

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#machine learning Preprint Oct 2026

Inverse Cross-spectral Neural Networks for Multivariate Time Series

CoVariance Neural Networks and their extensions have emerged as effective tools for processing multivariate data, deriving graph shift operators directly from second-order statistics. These architectures, however, are designed for independent and identically distributed observations and do not fully capture the joint s...

L. Marinucci, Leonardo Di Nino, Gabriele D'Acunto et al. · 0 citations
Preprint Aug 2026

Sheaf-Based Federated Representation Learning

The results show that Sheaf-FRL outperforms baseline approaches in terms of local and post-communication classification accuracy across different levels of local distribution shift and exhibits greater robustness to latent-space dimensionality compression.

Gabriele D’Acunto, Enrico Grimaldi, Valeria Avino et al. · 0 citations
Preprint Aug 2026

Sheaf-theoretic Signal Processing on Graphs: Spectral Theory, Filtering, and Sampling

This is the first paper to develop a unified sheaf signal processing (SSP) framework on network sheaves, extending the fundamental operations of signal processing, namely spectral analysis, filtering, and sampling, to heterogeneous local spaces.

Gabriele D’Acunto, Leonardo Di Nino, P. Di Lorenzo et al. · 0 citations
Preprint Aug 2026

Structured Sheaf Learning of Consistent Connection Graphs

Structured Connection Graph Learning (SCGL), a block-coordinate algorithm that combines closed-form updates, manifold projections, and spectral constraints, and converges to stationary points of the resulting nonconvex problem, is developed.

Leonardo Di Nino, Gabriele D’Acunto, Sergio Barbarossa et al. · 0 citations
Dataset Open access Jul 2026

VitaGraph: building a knowledge graph for biologically relevant learning tasks

VitaGraph is presented, a comprehensive multi-purpose biological knowledge graph built by integrating and refining multiple public datasets and enabling benchmarking of graph-based models and offering the opportunity to tackle tasks such as drug repurposing, PPI prediction, and side-effect prediction, among others.

Francesco Madeddu, Lucia Testa, Gianluca De Carlo et al. · 0 citations

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