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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…

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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…

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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…