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Xiaoyu Li

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#machine learning Preprint Oct 2026

A Categorical Atlas of Parameter-Efficient Fine-Tuning: Cones, Orbits, and Gauges

Parameter-efficient fine-tuning has hundreds of methods, usually compared by parameter count and benchmark score. We compare them as maps. A pretrained checkpoint is a base point in weight space, and a weight-space method is a smooth map from a small parameter space that starts at that point. These maps form a slice ca...

Xiaoyu Li, Zhizhou Sha, Chi-Wun Yang et al. · 0 citations
#machine learning Preprint Oct 2026

The Birkhoff Geometry of Manifold-Constrained Hyper-Connections: Two Channels, Vertex Viscosity, and Sinkhorn as a Retraction

Hyper-connections widen the residual stream of a Transformer to $n$ parallel streams. Their manifold-constrained version (mHC) mixes the streams at each layer with a doubly stochastic matrix, which it computes by Sinkhorn normalization of exponentiated logits. We give a geometric theory of this design on the Birkhoff p...

Xiaoyu Li, Zhizhou Sha, Chi-Wun Yang · 0 citations
Preprint Aug 2026

Beyond Sparse Weights: When Is Attention Compressible?

Results motivate CertKV, a training-free compressor that reserves one tail-summary slot per head and allocates the rest by value dispersion, which is top-two in seven of nine LongBench-v2 settings, remains in the leading compressed tier on 128K RULER, and realizes a ten-fold cache budget in a packed Llama prototype.

Chi-Wun Yang, Xiaoyu Li · 0 citations

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