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Nonnegative Matrix Factorization with Transform Learning

Citation Author(s):
Dylan Fagot, Herwig Wendt, Cédric Févotte
Submitted by:
Dylan Fagot
Last updated:
12 April 2018 - 4:53pm
Document Type:
Poster
Document Year:
2018
Event:
Presenters:
Dylan Fagot
Paper Code:
MLSP-P1.3202
 

Traditional NMF-based signal decomposition relies on the factorization of spectral data, which is typically computed by means of short-time frequency transform. In this paper we propose to relax the choice of a pre-fixed transform and learn a short-time orthogonal transform together with the factorization. To this end, we formulate a regularized optimization problem reminiscent of conventional NMF, yet with the transform as additional unknown parameters, and design a novel block-descent algorithm enabling to find stationary points of this objective function. The proposed joint transform learning and factorization approach is tested for two audio signal processing experiments, illustrating its conceptual and practical benefits

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