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cs.LG2026
T-ARC: Topology-Aware Randomized Clustering via Distributionally Robust Stochastic Block Models
Serena Grazia De Benedictis, Andersen Ang, Nicoletta Del Buono +2
In this work, we introduce a new clustering method, namely T-ARC (Topology-Aware Randomized Clustering), that corrects the geometric bias of K-means by embedding topological inform…
cs.LG2025
Sparse Hyperparametric Itakura-Saito Nonnegative Matrix Factorization via Bi-Level Optimization
Laura Selicato, Flavia Esposito, Andersen Ang +2
The selection of penalty hyperparameters is a critical aspect in Nonnegative Matrix Factorization (NMF), since these values control the trade-off between reconstruction accuracy an…
cs.LG2024
Sum-of-norms regularized Nonnegative Matrix Factorization
Andersen Ang, Waqas Bin Hamed, Hans De Sterck
When applying nonnegative matrix factorization (NMF), the rank parameter is generally unknown. This rank, called the nonnegative rank, is usually estimated heuristically since comp…