arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.2903cs.ITcs.CCmath.IT
收藏

熵测度与数学信息

Entropy Measures vs. Algorithmic Information

Andreia Teixeira, Andre Souto, Armando Matos, Luis Antunes

摘要:

数学熵和香农熵是两种概念上不同的信息度量,前者基于程序的大小,后者基于概率分布。然而,众所周知,对于任何递归概率分布,算法熵的期望值等于其香农熵,直到一个仅取决于分布的常数。我们研究了$α$阶的Rényi和Tsallis熵是否存在类似的关系,表明它只适用于1阶的Rényi和Tsallis熵(即,Shannon entropy)。关于时间有界的模拟关系,我们表明,对于分布,使累积概率分布是可计算的时间$t(n)$,时间有界的算法熵(其中分配的时间是$nt(n)\log (nt(n))$)的预期值是在同一范围内的无界版本。因此,对于这些分布,香农熵捕获了计算可访问信息的概念。证明了对于普适时间有界分布$\m^t(x)$,Tsallis熵和Rényi熵收敛当且仅当$α$大于1.

英文摘要:

Algorithmic entropy and Shannon entropy are two conceptually different information measures, as the former is based on size of programs and the later in probability distributions. However, it is known that, for any recursive probability distribution, the expected value of algorithmic entropy equals its Shannon entropy, up to a constant that depends only on the distribution. We study if a similar relationship holds for Rényi and Tsallis entropies of order $α$, showing that it only holds for Rényi and Tsallis entropies of order 1 (i.e., for Shannon entropy). Regarding a time bounded analogue relationship, we show that, for distributions such that the cumulative probability distribution is computable in time $t(n)$, the expected value of time-bounded algorithmic entropy (where the alloted time is $nt(n)\log (nt(n))$) is in the same range as the unbounded version. So, for these distributions, Shannon entropy captures the notion of computationally accessible information. We prove that, for universal time-bounded distribution $\m^t(x)$, Tsallis and Rényi entropies converge if and only if $α$ is greater than 1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑