arXiv Machine Learning By Xiaoyu Li, Lequan Lin, Dai Shi, Jiaojiao Jiang, Junbin Gao, Andi Han

The Ball and the Box: Two Geometries of Computation in Superposition

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The paper investigates how neural representations that use superposition can encode more features than their dimensionality. It derives sharp dimension thresholds for computing Boolean gates with a single threshold layer, distinguishing between two error criteria: a vanishing expected error count and high‑probability correctness of every output. The study reveals that the expected‑count threshold follows a ball geometry, while joint reliability follows a box geometry, and provides explicit thresholds for conjunction, disjunction, and majority gates, including a transition analysis for pairwise conjunction.

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The Ball and the Box: Two Geometries of Computation in Superposition

The paper investigates how neural representations that use superposition can encode more features than their dimensionality allows, focusing on the dimensionality required to compute Boolean gates. For a single threshold layer with a Gaussian random dictionary and uniformly random sparse Boolean inputs, the authors derive precise dimension thresholds under two error criteria: one based on vanishing expected error count and another on high‑probability correctness of every output. The study reveals a geometric distinction—ball geometry for expected‑count thresholds and box geometry for joint reliability—explains the gap via shared reads, and provides explicit thresholds for conjunction, disjunction, and majority gates, including a detailed analysis of pairwise conjunction near the threshold.

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