Algorithm 1$\alpha \beta$-N${}_x$-constrained weighted non-negative matrix factorization (CWNMF) residual (-R) method.

$i\leftarrow 0$  while $i\le N$ do   Update F at fixed G according to Equation (52) or (56)   Update G at fixed F according to Equation (12) or (53)   $i\leftarrow i+1$  end while