Description
x = grad_proj(b, lambda, pars)
b is the constant term in the Frobenius norm. lambda is the weight on the total variation penalty. pars is a structure with additional parameters: tol is the cutoff for the normed difference between successive iterates. If the difference falls below tol, the algorithm terminates. max_iters is the maximum number of iterations. bnds is a vector of the lower and upper bounds on the signal. dom is a binary matrix that equals 1 for all pixels in the non-zero support set. tv_type is the type of total variation penalty to use. Must be 'isotropic' or 'anisotropic'. https://matlab1.com/stochastic-gradient-descent/ https://matlab1.com/gradient-descent/
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