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Thank you for fruitful comments. We would like to rebut this criticism from the following two points. We would like to emphasize that this restriction is identical with assuming that the loss function is strongly convex. A huge body of theoretical works on convex empirical risk minimization problems have been devoted to the problems with strongly convex loss functions. If the reviewers claim that the scope of our work is narrow, the same criticism should be applied to those past works targeted to strongly convex loss functions.