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Francesco Silvestri

3 accepted papers

2026

The benefits of full data shuffle, now with optimal I/O cost: $k$-wise independence and matrix transposition to the rescue

ICML 2026poster

It is known that RandomShuffle, the without replacement version of Stochastic Gradient Descend (SGD), converges faster than with-replacement SGD. However, RandomShuffle requires to uniformly perform a random permutation of the input sequence, which is known to have an high I/O complexity due to data…

Cited by 0SourceScholar
2025

Dimensionality Reduction on Complex Vector Spaces for Euclidean Distance with Dynamic Weights

ICML 2025poster

The weighted Euclidean norm $||x||_w$ of a vector $x\in \mathbb{R}^d$ with weights $w\in \mathbb{R}^d$ is the Euclidean norm where the contribution of each dimension is scaled by a given weight. Approaches to dimensionality reduction that satisfy the Johnson–Lindenstrauss (JL) lemma can be easily a…

Cited by 0SourcePDFScholar
2025

On Finding Hubs in High Dimensions with Sampling

AAAI 2025technical

Hubs are a few points that frequently appear in the k-nearest neighbors (kNN) of many other points in a high-dimensional data set. The hubs' effects, called the hubness phenomenon, degrade the performance of kNN based models in high dimensions. We present SamHub, a simple sampling approach to effici…