 (22)
Although the quality function is substituted by  in purpose of reducing computation burden, the trend induced byis the same as by. Practically, a larger value of , i.e. a conservative update, will lead to relatively longer step lengths and smaller values of the first two terms in (22). However a large complementary gap will be produced meanwhile, so that the values of the last two terms in (22) are larger. The optimal value of can balance long step lengths and smaller complementary gap.
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