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Thin Nguyen

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#machine learning Preprint Sep 2026

Orthogonal Witness Control for Muon Optimization via Sigmoid Spectral Reshaping

A matrix-valued optimizer that preserves the singular subspaces of the gradient while applying a bounded, monotone sigmoid transformation to its singular values is introduced, and the effectiveness and robustness of Soren against established optimizers are demonstrated.

Dat Phi Van, Minh Vu Ngo, Tuc Nguyen et al. · 0 citations
Book Open access Aug 2026

A Geometric Information Bottleneck for Activation Steering

This work proposes a disentanglement-based intervention framework, termed IB-ACT, that identifies both where and how to intervene by exploiting the layer-wise geometry of representation spaces to isolate behavior-relevant information without disturbing other dimensions, and introduces a layer-selection mechanism determ...

Toan Doan, Thin Nguyen, Sunil Gupta · 0 citations
Book Open access Aug 2026

A Geometric Information Bottleneck for Activation Steering

This work proposes a disentanglement-based intervention framework, termed IB-ACT, that identifies both where and how to intervene by exploiting the layer-wise geometry of representation spaces to isolate behavior-relevant information without disturbing other dimensions, and introduces a layer-selection mechanism determ...

Toan Doan, Thin Nguyen, Sunil Gupta · 0 citations

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