Sparsity levels measured by the number of nonzero entries of
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(a) and (c) describe the sparsity levels of the -subproblem iterates of the ADMM algorithm, fit for a fixed ; (b) and (d) describe the sparsity levels of the -subproblem over the iterates of our proposed ADMM algorithmic regularization paths. (a) and (b) are for Model (I), and (c) and (d) are for Model (II)
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