Publications

2014

• QUIC: Quadratic Approximation for Sparse Inverse Covariance Matrix Estimation (pdf, software)
  C. Hsieh, M. Sustik, I. Dhillon, P. Ravikumar.
  Journal of Machine Learning Research (JMLR), October 2014.

2013

• BIG & QUIC: Sparse Inverse Covariance Estimation for a Million Variables (pdf, software)
  C. Hsieh, M. Sustik, I. Dhillon, P. Ravikumar, R. Poldrack.
  In Neural Information Processing Systems (NIPS), December 2013. (Oral)

2012

• On a Zero-Finding Problem involving the Matrix Exponential (pdf)
  M. Sustik, I. Dhillon.
  SIAM Journal of Matrix Analysis and Applications (SIMAX) 33(4), pp. 1237-1249, 2012.

2011

• Sparse Inverse Covariance Matrix Estimation using Quadratic Approximation (pdf)
  C. Hsieh, M. Sustik, I. Dhillon, P. Ravikumar.
  In Neural Information Processing Systems (NIPS), December 2011.

2009

• Low-Rank Kernel Learning with Bregman Matrix Divergences (pdf)
  B. Kulis, M. Sustik, I. Dhillon.
  Journal of Machine Learning Research (JMLR) 10, pp. 341-376, February 2009.

2007

• On the Existence of Equiangular Tight Frames (pdf)
  M. Sustik, J. Tropp, I. Dhillon, R. Jr..
  Linear Algebra and its Applications 426(2), pp. 619-635, October 2007.
  (A previous version appears as UTCS Technical Report #TR-04-32, August 2004.)

2006

• Learning Low-Rank Kernel Matrices (pdf)
  B. Kulis, M. Sustik, I. Dhillon.
  In International Conference on Machine Learning (ICML), pp. 505-512, July 2006.

2005

• Generalized Finite Algorithms for Constructing Hermitian Matrices with Prescribed Diagonal and Spectrum (pdf)
  I. Dhillon, R. Jr., M. Sustik, J. Tropp.
  SIAM Journal of Matrix Analysis and Applications (SIMAX) 27(1), pp. 61-71, June 2005.