Is there a pseudoinverse for tensors of finitary rank?

Math
Tensors
Author

Galen Seilis

Published

June 22, 2021

This question was automatically deleted from math.stackexchange.com.

Question

Matrices estimated from data are not always invertible. Fortunately a ‘nearest inverse’ can be calculated with the Moore-Penrose inverse. Recently I have been taking inverses of tensors of rank greater than two that are calculated from real-world data, but I am finding that they are often non-invertible.

Is there a pseudoinverse for finitary rank tensors in a similar sense to the Moore-Penrose pseudoinverse?