Author

Zi-Jian Su

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#machine learning Preprint Sep 2026

Concept Subspaces Compute Beyond the Logit Lens: A Weights-Only Test for Locating Representations Upstream of Readout

A concept subspace's effect on model behavior does not establish how it relates to the output readout. We introduce a two-sided geometric diagnostic that measures an extracted subspace's overlap with the dominant right-singular directions of the unembedding matrix, evaluated against output-oriented positive controls. G...

Ao-Jie Yuan, Z. Su, Hai-Yu Zhang et al. · 0 citations

#machine learning Preprint Sep 2026

Jacobian Rank Collapse in Decision-Focused Learning

Decision-focused learning (DFL) trains predictors through downstream objectives, but a different loss need not provide an independent parameter-update direction. We characterize this restriction through the predictor Jacobian, using sparse index tracking to distinguish the covariance entries read by the optimizer from...

Ao-Jie Yuan, Hai-Yu Zhang, Zi-Jian Su · 0 citations