1:	Initialize $\mathbf{W}$ randomly
2:	for$i=1:\mathrm{numIter}$do
3:	Nonnegative Sparse Coding: Sparsely encode data $\mathbf{X}$, using fixed basis matrix $\mathbf{W}$, resulting in a sparse, nonnegative matrix $\mathbf{H}$.
4:	Basis Matrix Update: Enhance basis matrix $\mathbf{W}$ and coding matrix $\mathbf{H}$, maintaining the sparse structure of $\mathbf{H}$.
5:	end for