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Local Low-Rank Matrix Approximation

Speaker  Guy Lebanon

Affiliation  Amazon

Host  Ran Gilad-Bachrach

Duration  01:04:45

Date recorded  6 May 2014

Matrix approximation is a common tool in recommendation systems, text mining, and computer vision. A prevalent assumption in constructing matrix approximations is that the partially observed matrix is of low-rank. We propose a new matrix approximation model where we assume instead that the matrix is locally of low-rank, leading to a representation of the observed matrix as a weighted sum of low-rank matrices. We analyze the accuracy of the proposed local low-rank modeling. Our experiments show significant improvements in prediction accuracy in the context of recommendation systems.

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