sample_metropolis_h_reparam: sample h_n given all the other h in the same column with...
In alumbreras/MMLE-GaP:

1 2	sample_metropolis_h_reparam(v_n, W, h_n_current, alpha = 1, beta = 1, step = 1, iter = 100)

`v_n`	n-th column of matrix V (F x 1)
`W`	dictionary matrix (F x K)
`h_n_current`	(K x 1) initial value h_n (n-th column of matrix H)
`alpha`	parameter alpha
`beta`	parameter beta
`step`	step size for the proposal distribution
`iter`	number of samples (or "iterations")