Selected talks
8 April 2024: Workshop on Nonsmooth Optimization and Applications (NOPTA 2024), "Inertial and Extrapolated Block Majorization Minimization with Application to NMF". [pdf]
10 October 2023: seminar at the U. of Eindhoven, "Separable Nonnegative Matrix Factorization". [pdf]
14 April 2023: ERGO seminar at the U. of Edinburgh, "Nonnegative Matrix Factorization and Optimization". [pdf]
16 February 2023: One World Mathematics of INformation, Data, and Signals (1W-MINDS) Seminar, online, "Nonnegative Matrix Factorization: Introduction, Identifiability and Beyond". [pdf] [video]
3-4 November 2022: GAMM Workshop on Computational and Mathematical Methods in Data Science (COMinDS), Magdeburg, "Nonnegative Matrix Factorization: Introduction, Identifiability and Computation", [pdf].
26-30 September 2022: SIAM Conference on Mathematics of Data Science (MDS22), "Partial identifiability for nonnegative matrix factorization", [pdf].
20-24 June 2022: 24th Conference of the International Linear Algebra Society (ILAS), "Historical tour on the nonnegative rank", [pdf].
6-10 September 2021: Mini-course "Solving matrix nearness problems via Hamiltonian systems, matrix factorization, and optimization" at the CIME summer school on "Matrix nearness problems and eigenvalue optimization" [pdf].
20 May 2021: Mini-tutorial at the SIAM LA conference, with X. Fu and K. Huang, "Learning with Nonnegative Matrix Factorizations", [pdf]
27 January 2021: E-NLA seminar, "Identifiability and Computation of Nonnegative Matrix Factorizations", [pdf] [video]
9-11 December 2020: IEEE International Conference on Image Processing, Applications and Systems (IPAS 2020), online, "Some recent results on nonnegative matrix factorizations with application in hyperspectral imaging". [pdf]
15-18 December 2019: Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP 2019), Guadeloupe, "Successive Projection Algorithm Robust to Outliers". [pdf]
28 January 2019: Intelligent Machines and Mathematics, Bologna, Italy, "Linear dimensionality reduction for data analysis". [pdf] [video]
10-13 September 2018: Workshop on Optimization and Learning, Toulouse, France, "Computing nonnegative matrix factorizations". [pdf]
27-31 August 2018: Summer School - Tensor-Based Signal Processing, Leuven, Belgium, "Dictionary-based and sparse decompositions". [pdf]
12-15 June 2018: 10th Workshop on Structural Dynamical Systems: Computational Aspects (SDS 2018), Capitolo, Italy, "Finding the Nearest Linear Time-Invariant Dynamical Systems". [pdf]
10-19 July 2017: Workshop on Numerical Linear Algebra at the conference on Foundations of Computational Mathematics, Barcelona, Spain, "On the complexity of low-rank matrix approximations". [pdf]
14-17 June 2016: 9th Workshop on Structural Dynamical Systems: Computational Aspects (SDS 2016), and June 1st 2016: MATHICSE seminar, EPFL, "Constrained Low-Rank Matrix Approximations". [Slides]
13-17 July 2015, Pittsburgh, Int. Symp. on Mathematical Programming (ISMP), "Exact and Heuristic Algorithms for Semi-Nonnegative Matrix Factorization". [Slides]
15-20 February 2015, Wadern, Dagstuhl Seminar on `Limitations of convex programming: lower bounds on extended formulations and factorization ranks', "Numerical Computation of Nonnegative and PSD Factorizations". [Slides]
June 24-27, 2014, Lausanne, WHISPERS, and December 15, 2014, Nice, MAHI workshop: Methodological Aspects of Hyperspectral Imaging: "Enhancing Pure-Pixel Identification Performance via Preconditioning". [Slides]
June 9-13, 2014, Spa (Belgium): Householder Symposium XIX, Householder award for best PhD thesis in Numerical Linear Algebra: "Nonnegative Matrix Factorization: Complexity, Algorithms and Applications". [Slides]
May 19-22, 2014, San Diego: SIAM conference on Optimization. Organizing the minisymposium `Recent Advances in Nonnegative Matrix Factorization and Related Problems' with Steve Vavasis: "Semidefinite Programming Based Preconditioning for More Robust Near-Separable Nonnegative Matrix Factorization". [Slides]
November 17-18, 2013, Hong Kong: International Workshop on Numerical Linear Algebra with Applications (in Honnor of Bob Plemmons' 75th Birthday): "Some Recent Advances in Nonnegative Matrix Factorization and their Applications to Hyperspectral Unmixing". [Slides]
June 3, 2013, Boston: Seminar at LIDS, MIT and June 21st, workshop on Numerical Linear Algebra in Machine Learning, ICML 2013, Atlanta: "Recent Advances in Nonnegative Matrix Factorization". [Slides]
February 18-22, 2013: Dagstuhl Seminar on Communication complexity, linear optimization, and lower bounds for the nonnegative rank of matrices: "Robust Near-Separable Nonnegative Matrix Factorization Using Linear Optimization". [Slides] [Video]
August 19-24, 2012, Berlin: International Symposium on Mathematical Programming (ISMP): "Fast and Robust Recursive Algorithms for Separable Nonnegative Matrix Factorization". [Slides]
June 18-22, 2012, Valencia, SIAM conference on Applied Linear Algebra: "Sparse and Unique Nonnegative Matrix Factorization Through Data Preprocessing". [Slides]
October 14-15, 2011, Toronto: 13th Midwest Optimization Meeting & Workshop on Large Scale Optimization and Applications: "Complexity of Low-Rank Matrix Approximations with Weights or Missing Data". [Slides]
July 9-10, 2011, Coimbra: Directions in Matrix Theory: "Bounds for the nonnegative rank based on a geometric interpretation". [Slides]
June 6-9, 2011, Lisbon: Third Worskshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS): Sparse Nonnegative Matrix Underapproximation and its Application to Hyperspectral Image Analysis". [Slides]
OR Reading Seminar (when I was a PhD student)
Dukanovic and Rendl, Semidefinite programming relaxations for graph coloring and maximal clique problems, Mathematical Programming, 2007. [Slides]
Koren, Bell and Volinsky, Matrix Factorization Techniques for Recommender systems, IEEE Computer, 2009. [Slides]
Candès and Tao, Decoding by Linear Programming, IEEE Transactions on Information Theory, 2005. [Slides]