Author

Xiaoyin Chen

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#artificial intelligence Preprint Oct 2026

A Tropical Geometry View of Forgetting: A Per-Unit Projector for Knowledge-Preserving Fine-Tuning

Fine-tuning a language model on new text degrades what it already does. Replay-free projectors such as Adam-NSCL and GPM forbid one shared subspace of a layer's inputs in every row of the update. The tropical geometry of a ReLU layer shows why this is too coarse. In data space, the units'walls are tropical hypersurface...

Yu-Yang Zhang, Xiao-Yin Chen, Chun-Lin Ren et al. · 0 citations

Preprint Aug 2026

Bayesian Symbolic Regression with Entropic Reinforcement Learning

Symbolic regression is the problem of finding an algebraic expression describing a stochastic dependence of a target variable on a set of inputs. Unlike forms of regression that fit parameters assuming a fixed model structure, symbolic regression is a search problem over the space of expressions, represented, for examp...

Oussama Boussif, Mohammed Mahfoud, Younesse Kaddar et al. · 2 citations