ICCOPT 2013 Talk, Auditorium B, Wednesday, July 31, 11:30-13:00

 Speaker: Jared Tanner, University of Oxford, UK
 Title: Matrix completion at the edge of optimal
 Co-authors: Ke Wei

 Abstract:
Scientific Program

Matrix completion and low rank matrix recovery is a technique by which a low rank matrix is measured either by sampling entries of the matrix or through matrix products. Rank $r$ matrices of size $m \times n$ have $r(m+n-r)$ degrees of freedom, requiring at least the same number of entries to be known. Computationally efficient algorithms, such as semidefinite programming, have been shown to be able to recover a rank $r$ matrix from a modest multiple of the number of degrees of freedom. In this talk we present new nonconvex algorithms for matrix completion and present empirical evidence that these algorithms are able to recover low rank matrices from a multiple of the oracle rate where the multiple is observed to converge towards one, giving the optimal rate.


 Talk in: Organized Session Wed.A.AB Sparse and low-rank optimization
 Cluster: Nonlinear optimization


 Go to: Wed.A
 Go to: unframed Scientific Program

 Go to: ICCOPT 2013 Main Webpage