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Alexandru-Iulius Jerpelea

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#machine learning Preprint Aug 2026

A Deeper Analysis of Block-Sparse Featurizers

This work proposes several architectural changes to the BSF, including a Tournament Top-K selection rule that significantly reduces feature splitting, and extends the block paradigm to the crosscoder.

Alexandru-Iulius Jerpelea, Amith Ananthram · 0 citations
#small language model Preprint Aug 2026

Planting a Latent Variable in Natural-Looking Text: a More Realistic Test of Belief States in LLMs and Their Link to Concept Geometry

This work plants a controllable latent variable inside natural-looking text and arranges the 8 states themselves on a ring, in the exact order of the Markov chain, which is supporting evidence that a concept's geometry can be formed by the statistical dynamics of the latent variable behind it.

Alexandru-Iulius Jerpelea · 0 citations