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arXiv 1504.08070cs.ITmath.ITmath.STstat.TH
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幂律分布的普适压缩

Universal Compression of Power-Law Distributions

Moein Falahatgar, Ashkan Jafarpour, Alon Orlitsky, Venkatadheeraj Pichapati, Ananda Theertha Suresh

摘要:

众所周知,英语单词和许多其他自然过程的输出都遵循Zipf分布。然而,这种完全确定的性质从未被证明有助于压缩或预测这些重要的过程。我们发现,Zipf分布的顺序$α>1$的预期冗余大致是$1/α$功率的预期冗余的无限制分布。因此,对于这些阶,Zipf分布可以比以前已知的更好地压缩和预测。与预期的情况不同,我们表明,最坏情况下的冗余是大致相同的Zipf和无限制的分布。因此,Zipf分布具有显着不同的最坏情况和预期冗余,使其成为第一个具有这种差异的自然分布类。

英文摘要:

English words and the outputs of many other natural processes are well-known to follow a Zipf distribution. Yet this thoroughly-established property has never been shown to help compress or predict these important processes. We show that the expected redundancy of Zipf distributions of order $α>1$ is roughly the $1/α$ power of the expected redundancy of unrestricted distributions. Hence for these orders, Zipf distributions can be better compressed and predicted than was previously known. Unlike the expected case, we show that worst-case redundancy is roughly the same for Zipf and for unrestricted distributions. Hence Zipf distributions have significantly different worst-case and expected redundancies, making them the first natural distribution class shown to have such a difference.

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。

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