## Canonical polyadic decomposition of third-order tensors: Relaxed uniqueness conditions and algebraic algorithm

Ignat Domanov, Lieven De Lathauwer

### Abstract

Canonical Polyadic Decomposition (CPD) of a third-order tensor is a minimal decomposition into a sum of rank-1 tensors. We find new mild deterministic conditions for the uniqueness of individual rank-1 tensors in CPD and present an algorithm to recover them. We call the algorithm "algebraic" because it relies only on standard linear algebra. It does not involve more advanced procedures than the computation of the null space of a matrix and eigen/singular value decomposition. Simulations indicate that the new conditions for uniqueness and the working assumptions for the algorithm hold for a randomly generated $I \times J \times K$ tensor of rank $R\geq K\geq J \geq I \geq 2$ if $R$ is bounded as $R\leq (I+J+K-2)/2+(K-\sqrt{(I-J)^2+4K})/2$ at least for the dimensions that we have tested. This improves upon the famous Kruskal bound for uniqueness $R\leq(I+J+K-2)/2$ as soon as $I\geq 3$. In the particular case $R=K$, the new bound above is equivalent to the bound $R\leq(I-1)(J-1)$ which is known to be necessary and sufficient for the generic uniqueness of the CPD. An existing algebraic algorithm (based on simultaneous diagonalization of a set of matrices) computes the CPD under the more restrictive constraint $R(R-1)\leq I(I-1)J(J-1)/2$ (implying that $R< (J-\frac{1}{2})(I-\frac{1}{2})/\sqrt{2}+1$). We give an example of a low-dimensional but high-rank CPD that cannot be found by optimization-based algorithms in a reasonable amount of time while our approach takes less than a second. We demonstrate that, at least for $R\leq 24$, our algorithm can recover the rank-1 tensors in the CPD up to $R\leq (I-1)(J-1)$.

### Code description

This package provides files for the paper on relaxed uniqueness conditions and an algebraic algorithm for CPD.

### Reference

I. Domanov, L. De Lathauwer, "Canonical polyadic decomposition of third-order tensors: Relaxed uniqueness conditions and algebraic algorithm," Linear Algebra and its Applications, vol. 513, p. 342-375, Jan. 2017.

### Download code

This repository can be cited as:

S. Hendrikx, M. Boussé, N. Vervliet, M. Vandecappelle, R. Kenis, and L. De Lathauwer, *Tensorlab⁺*, Available online, Version of Dec 2022 downloaded from https://www.tensorlabplus.net.