Weighted Tensor Decomposition for Learning Latent Variables with Partial Data

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Omer Gottesman, Weiwei Pan, Finale Doshi-Velez ;
Proceedings of the Twenty-First International Conference on Artificial Intelligence and Statistics, PMLR 84:1664-1672, 2018.

Abstract

Tensor decomposition methods are popular tools for learning latent variables given only lowerorder moments of the data. However, the standard assumption is that we have sufficient data to estimate these moments to high accuracy. In this work, we consider the case in which certain dimensions of the data are not always observed–common in applied settings, where not all measurements may be taken for all observations–resulting in moment estimates of varying quality. We derive a weighted tensor decomposition approach that is computationally as efficient as the non-weighted approach, and demonstrate that it outperforms methods that do not appropriately leverage these less-observed dimensions.

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