Generalised Pinsker Inequalities
Generalised Pinsker Inequalities
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广义平斯克不等式
DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
R. C. Williamson
中科院分区:
文献类型:
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作者:
Mark D. Reid;R. C. Williamson
We generalise the classical Pinsker inequality which relates variational divergence to Kullback-Liebler divergence in two ways: we consider arbitrary f-divergences in place of KL divergence, and we assume knowledge of a sequence of values of generalised variational divergences. We then develop a best possible inequality for this doubly generalised situation. Specialising our result to the classical case provides a new and tight explicit bound relating KL to variational divergence (solving a problem posed by Vajda some 40 years ago). The solution relies on exploiting a connection between divergences and the Bayes risk of a learning problem via an integral representation.