This paper presents a general methodology for deriving information-theoretic generalization bounds for learning algorithms. The main technical tool is a probabilistic decorrelation lemma based on a change of measure and a relaxation of Young's inequality in $L_{\psi_p}$ Orlicz spaces. Using the decorrelation lemma in combination with other techniques, such as symmetrization, couplings, and chaining in the space of probability measures, we obtain new upper bounds on the generalization error, both in expectation and in high probability, and recover as special cases many of the existing generalization bounds, including the ones based on mutual information, conditional mutual information, stochastic chaining, and PAC-Bayes inequalities. In addition, the Fernique-Talagrand upper bound on the expected supremum of a subgaussian process emerges as a special case.

文中提出了一种利用概率去相关引理、对测度空间中的的概率测度进行对称化、配对和链化等技术来获得学习算法信息论泛化界限的一般性方法，进而得到新的期望值和高概率条件下泛化误差的上界，特别地，还包括了基于互信息、条件互信息、随机链和PAC-Bayes不等式等现有泛化界限的特例。此外，Fernique-Talagrand上界也是一个特例。

信息论泛化界的统一框架