We consider the problem of computing a restricted nonnegative matrix factorization (NMF) of an m x n matrix X. Specifically, we seek a factorization X ≈ BC, where the k columns of B are a subset of those from X and C ∈ ...

With the recent explosion in data collection, big datasets are becoming more difficult to handle. The size of these datasets can cause algorithms to become intractable in time or space, but noise and outliers can also cause ...