arXiv Machine Learning By Roberto Rossi

A Structural Interpretation of GELU and Threshold-Transmission Activations via the First-Order Loss Function

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arXiv:2607. 03664v1 Announce Type: new Abstract: The Gaussian Error Linear Unit is usually motivated as the expected output of an input-dependent stochastic Bernoulli gate.

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arXiv Computation and Language
Sep 3

GAPS: Dimension-Level Gates for Conditional Activation Steering

The paper introduces GAPS, a dimension‑level gating approach for activation steering in language models. GAPS uses two training‑free gates—a static separability gate based on AUROC and a dynamic posterior gate based on a Gaussian model—to selectively apply steering vectors only to neurons that carry reliable concept information or are currently mis‑activated. Experiments on Gemma‑3 and Qwen‑3 show that GAPS improves or matches the performance of token‑level methods, notably reducing Gemma‑3’s toxicity rate from 6.52% to 0.48% under a fixed capability budget.

By Moghis Fereidouni, Muhammad Umair Haider, Hassan Sajjad, A. B. Siddique