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Rethinking LDA: Moment Matching for Discrete ICA
Anastasia Podosinnikova · Francis Bach · Simon Lacoste-Julien

Mon Dec 07 04:00 PM -- 08:59 PM (PST) @ 210 C #39

We consider moment matching techniques for estimation in Latent Dirichlet Allocation (LDA). By drawing explicit links between LDA and discrete versions of independent component analysis (ICA), we first derive a new set of cumulant-based tensors, with an improved sample complexity. Moreover, we reuse standard ICA techniques such as joint diagonalization of tensors to improve over existing methods based on the tensor power method. In an extensive set of experiments on both synthetic and real datasets, we show that our new combination of tensors and orthogonal joint diagonalization techniques outperforms existing moment matching methods.

Author Information

Anastasia Podosinnikova (ENS - Inria)
Francis Bach (INRIA - ENS)
Simon Lacoste-Julien (INRIA)

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