arXiv Machine Learning

Higher order PCA-like rotation-invariant features for detailed shape descriptors modulo rotation

arXiv:2601. 03326v2 Announce Type: replace-cross Abstract: PCA can be used for rotation invariant features, describing a shape with its $p_{ab}=E[(x_i-E[x_a])(x_b-E[x_b])]$ covariance matrix approximating shape by ellipsoid, allowing for rotation invariants like its traces of powers.

arXiv Machine Learning
Sep 16

Universal Feature Selection with Noisy Observations and Weak Symmetry Conditions

arXiv:2605.09396v2 Announce Type: replace-cross Abstract: This paper relaxes the restrictive symmetry conditions adopted in [4], [5] and extends their universal feature selection framework to accommo...

By Dier Tang (Department of Mathematics, The University of Hong Kong, Hong Kong, China), Guangyue Han (Department of Mathematics, The University of Hong Kong, Hong Kong, China)
arXiv Machine Learning
Jul 8

Geometric Stability: The Missing Axis of Representations

arXiv:2601. 09173v5 Announce Type: replace Abstract: Representational similarity analysis and related methods compare the internal geometries of neural networks, but they measure only alignment between spaces, leaving a blind spot -- whether a representation's structure is reliably recoverable, not merely similar.

By Prashant C. Raju