Abstract
We investigate the effect of an \(\varepsilon \)-room of perturbation tolerance on symmetric tensor decomposition. To be more precise, suppose a real symmetric d-tensor f, a norm \(\left\Vert \cdot \right\Vert \) on the space of symmetric d-tensors, and \(\varepsilon >0\) are given. What is the smallest symmetric tensor rank in the \(\varepsilon \)-neighborhood of f? In other words, what is the symmetric tensor rank of f after a clever \(\varepsilon \)-perturbation? We prove two theorems and develop three corresponding algorithms that give constructive upper bounds for this question. With expository goals in mind, we present probabilistic and convex geometric ideas behind our results, reproduce some known results, and point out open problems.
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Acknowledgements
We thank Jiawang Nie for answering our questions on optimization of low-rank symmetric tensors using sum of squares. We thank Sergio Cristancho and Mauricio Velasco for explaining the mathematical underpinning of their quadrature rule in [14], and allowing us to implement it in Python. We thank Carlos Castro Rey for his valuable help and feedback on the Python implementation. A.E. was partially supported by NSF CCF 2110075. P.V. is supported by Simons Foundation grant 638224.
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Ergür, A.A., Rebollo Bueno, J. & Valettas, P. Approximate Real Symmetric Tensor Rank. Arnold Math J. 9, 455–480 (2023). https://doi.org/10.1007/s40598-023-00235-4
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DOI: https://doi.org/10.1007/s40598-023-00235-4