Université de Bordeaux
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Seminar Ha Quang Minh, RIKEN Center for Advanced Intelligence Project of Tokyo - July 10th 2019 - Amphithéâtre Jean-Paul DOM, IMS (bâtiment A31)

10/07 : 11h - 12h
Created Thursday 30 May 2019

We are honoured to annonce the seminar of

 
Ha Quang Minh, RIKEN Center for Advanced Intelligence Project of Tokyo
Covariance matrices and covariance operators in machine learning and applications a geometrical framework
Wednesday July 10th at 11h00 Amphithéâtre Jean-Paul DOM IMS Bâtiment A31

Ha Quang Minh, RIKEN Center for Advanced Intelligence Project de Tokyo

Abstract
Symmetric positive definite (SPD) matrices, in particular covariance matrices, play important roles in many areas of mathematics and statistics, with numerous applications in various different fields of science and engineering, including machine learning, brain imaging, and computer vision. The set of SPD matrices is not a vector subspace of Euclidean space and consequently algorithms utilizing the Euclidean metric tend to be suboptimal in practice. A lot of recent research has therefore focused on exploiting the intrinsic non-Euclidean geometrical structures of SPD matrices, in particular from the viewpoint of Riemannian geometry. In this talk, we will present a survey of some of the recent developments in the generalization of the geometrical structures of finite-dimensional covariance matrices to the setting of infinite-dimensional covariance operators. Computationally, we focus on covariance operators in Reproducing Kernel Hilbert Spaces (RKHS). This direction exploits the power of kernel methods from machine learning in a geometrical framework, both mathematically and algorithmically. The theoretical formulation will be illustrated with applications in computer vision, which demonstrate both the power of kernel covariance operators as well as of the algorithms based on their intrinsic geometry.

Contact: "Yannick Berthoumieu



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