# LieDetect: Detection of representation orbits of compact Lie groups from point clouds

arXiv: https://arxiv.org/abs/2309.03086 · HTML: https://mlsanity.com/paper/2309.03086/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- Builds on 2 of its 43 references that are in the map.
- First posted on arXiv 26 Jul 2023.

## Builds on (most cited first, 2 of 2)

- [Lie PCA: Density estimation for symmetric manifolds](https://mlsanity.com/paper/2008.04278/) (2020)
- [Recovering the homology of immersed manifolds](https://mlsanity.com/paper/1912.03033/) (2019)

## Built on by (most cited first, 1 of 1)

- [Whitney extensions on symmetric spaces](https://mlsanity.com/paper/2407.21420/) (2024)

## Abstract (arXiv)

We suggest a new algorithm to estimate representations of compact Lie groups from finite samples of their orbits. Different from other reported techniques, our method allows the retrieval of the precise representation type as a direct sum of irreducible representations. Moreover, the knowledge of the representation type permits the reconstruction of its orbit, which is useful for identifying the Lie group that generates the action, from a finite list of candidates. Our algorithm is general for any compact Lie group, but only instantiations for SO(2), T^d, SU(2), and SO(3) are considered. Theoretical guarantees of robustness in terms of Hausdorff and Wasserstein distances are derived. Our tools are drawn from geometric measure theory, computational geometry, and optimization on matrix manifolds. The algorithm is tested for synthetic data up to dimension 32, as well as real-life applications in image analysis, harmonic analysis, density estimation, equivariant neural networks, chemical conformational spaces, and classical mechanics systems, achieving very accurate results.