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lasso_ProximalGD_Accelerated_ADMM

https://www.authorea.com/users/254721/articles/349097-lasso-proximal-accelerated-proximal-gradient-method-admm

minimize f(x) + g(x)

Proximal gradient descent: minimize g(x) using proximal operator and performance gradient updates on f(x), which has convergence rate of O(1/k).

Accelerated proximal gradient method: include a momentum term to avoid overshooting with faster convergence rate of O(1/k^2).

ADMM: Treats two functions, the objective and constraint, separately. The goal is to minimize f(x)+g(x) subject to (x = z). The u is the running sum of the errors(x - z).

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