Probabilistic Curve Learning: Coulomb Repulsion and the Electrostatic Gaussian Process

TL;DR

This paper introduces a probabilistic manifold learning method called electrostatic Gaussian process (electroGP), which uses Coulomb repulsion to improve the learning of low-dimensional structures in data, addressing limitations of existing models.

Contribution

The paper proposes a novel Coulomb repulsive process combined with Gaussian processes to better learn manifolds and their distributions, overcoming identifiability issues in prior models.

Findings

Enhanced performance in manifold learning tasks

Effective in filling missing data in videos

Addresses identifiability problems of previous models

Abstract

Learning of low dimensional structure in multidimensional data is a canonical problem in machine learning. One common approach is to suppose that the observed data are close to a lower-dimensional smooth manifold. There are a rich variety of manifold learning methods available, which allow mapping of data points to the manifold. However, there is a clear lack of probabilistic methods that allow learning of the manifold along with the generative distribution of the observed data. The best attempt is the Gaussian process latent variable model (GP-LVM), but identifiability issues lead to poor performance. We solve these issues by proposing a novel Coulomb repulsive process (Corp) for locations of points on the manifold, inspired by physical models of electrostatic interactions among particles. Combining this process with a GP prior for the mapping function yields a novel electrostatic GP (electroGP) process. Focusing on the simple case of a one-dimensional manifold, we develop efficient inference algorithms, and illustrate substantially improved performance in a variety of experiments including filling in missing frames in video.