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Issue No. 01 - January (2010 vol. 32)
ISSN: 0162-8828
pp: 45-55
Chris Ding , University of Texas at Arlington, Arlington
Tao Li , Florida International University, Miami
Michael I. Jordan , University of California at Berkeley, Berkeley
We present several new variations on the theme of nonnegative matrix factorization (NMF). Considering factorizations of the form X=FG^T, we focus on algorithms in which G is restricted to containing nonnegative entries, but allowing the data matrix X to have mixed signs, thus extending the applicable range of NMF methods. We also consider algorithms in which the basis vectors of F are constrained to be convex combinations of the data points. This is used for a kernel extension of NMF. We provide algorithms for computing these new factorizations and we provide supporting theoretical analysis. We also analyze the relationships between our algorithms and clustering algorithms, and consider the implications for sparseness of solutions. Finally, we present experimental results that explore the properties of these new methods.
Nonnegative matrix factorization, singular value decomposition, clustering.

C. Ding, T. Li and M. I. Jordan, "Convex and Semi-Nonnegative Matrix Factorizations," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 32, no. , pp. 45-55, 2008.
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