The entropic barrier: a simple and optimal universal self-concordant barrier
The entropic barrier: a simple and optimal universal self-concordant barrier
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熵势垒:一种简单且最优的通用自和谐势垒
DOI:
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发表时间:
2014
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通讯作者:
Ronen Eldan
中科院分区:
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作者:
Sébastien Bubeck;Ronen Eldan
We prove that the Cramer transform of the uniform measure on a convex body in $mathbb{R}^n$ is a $(1+o(1)) n$-self-concordant barrier, improving a seminal result of Nesterov and Nemirovski. This gives the first explicit construction of a universal barrier for convex bodies with optimal self-concordance parameter. The proof is based on basic geometry of log-concave distributions, and elementary duality in exponential families.