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MATSUZAWA, Tomoki; ITO, Eisuke; RELATOR, Raissa; SESE, Jun; KATO, Tsuyoshi
IEICE Transactions on Information and Systems, 04/2017, Volume: E100.D, Issue: 4Journal Article
In recent years, covariance descriptors have received considerable attention as a strong representation of a set of points. In this research, we propose a new metric learning algorithm for covariance descriptors based on the Dykstra algorithm, in which the current solution is projected onto a half-space at each iteration, and which runs in O(n3) time. We empirically demonstrate that randomizing the order of half-spaces in the proposed Dykstra-based algorithm significantly accelerates convergence to the optimal solution. Furthermore, we show that the proposed approach yields promising experimental results for pattern recognition tasks.
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