Matrix factorization with Binary Components

Abstract

Motivated by an application in computational biology, we consider low-rank matrix factorization with \0,1\-constraints on one of the factors and optionally convex constraints on the second one. In addition to the non-convexity shared with other matrix factorization schemes, our problem is further complicated by a combinatorial constraint set of size 2^m r, where m is the dimension of the data points and r the rank of the factorization. Despite apparent intractability, we provide - in the line of recent work on non-negative matrix factorization by Arora et al. (2012) - an algorithm that provably recovers the underlying factorization in the exact case with O(m r 2^r + mnr + r^2 n) operations for n datapoints. To obtain this result, we use theory around the Littlewood-Offord lemma from combinatorics.

Tasks

Reproductions