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Marcos V. Treviso

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#machine learning Preprint Oct 2026

How Sparse Probability Maps Shape Mixture-of-Experts Routing

Mixture-of-experts (MoE) routers typically apply softmax to the router scores and keep the top-K experts, making every token use exactly K experts. Sparsity-inducing probability maps such as sparsemax, alpha-entmax and normmax can adaptively assign exact zeros to selected experts, and therefore appear to offer token-de...

Tomás Brogueira, Marcos V. Treviso, Miguel Couceiro · 0 citations
#machine learning Preprint Oct 2026

Length Generalization Needs Proper Regularization

Length generalization is the ability of sequential models to perform well on context lengths unseen during training. In this work, we show that the challenge of achieving length generalization is related not only to architectural choices such as positional encoding and the attention mechanism but also to the training p...

Pavlo Vasylenko, Matthias Lindemann, André F. T. Martins et al. · 0 citations

EntmaxKV: Support-Aware Decoding for Entmax Attention

EntmaxKV is introduced, an entmax-native sparse decoding framework that exploits sparsity before KV pages are loaded, and a Gaussian-aware entmax selector that estimates the entmax threshold from lightweight page statistics, adapting the selected budget to the score distribution.

Gonçalo Duarte, Miguel Couceiro, Marcos V. Treviso · 0 citations

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