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Alternating directions method of multipliers(ADMM)is recognized as a powerful approach for the structured convex optimization with two separable operators.When ADMM is extended directly to a three-block separable convex minimization model,it was recently shown that the convergence is not guaranteed.This talk will give a slightly changed ADMM for solving multiblock separable convex optimization.We show the contraction property,prove the global convergence and establish the worst-case convergence rate of the method.