Iterative Atom Refinement: A Monotonicity Principle for Dictionary Learning

Alexander Christie, Miguel Moscoso, Alexei Novikov +2

Dictionary learning seeks to recover an unknown dictionary $A$ from observations ${\mathbf{y}}_i=A{\mathbf{x}}_i$ with sparse coefficient vectors ${\mathbf{x}}_i$. We introduce the \emph{Iterat…