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Comparison of PG and AG in terms of the computation time in seconds (left column) and the iteration number (right column) with different stopping criteria. The x-axis indexes the stopping criterion from 10–1 to 10–10. Note that we stop PG or AG when the change of the objective value in Eq. (45) is smaller than the value of the stopping criterion. For the first row, we set γ = 1, τ = 2; for the second row, we set γ = 6, τ = 4.
