逼近最优双向宏格式
Approximating Optimal Bidirectional Macro Schemes
摘要：
Lempel-Ziv是一个易于计算的所谓宏方案家族的成员;它限制指针只能指向一个方向。最佳双向宏方案是NP完全的，但它们可以提供更好的压缩高度重复的序列。我们考虑最优双向宏格式的逼近问题。我们描述了一个模拟退火算法，通常收敛很快。此外，在某些情况下，我们得到的双向宏计划，可证明是一个2-近似的最佳。我们测试我们的算法在一些人工重复的文本，并验证它是有效的，在实践中，优于Lempel-Ziv，有时由一个很大的利润率。
英文摘要：
Lempel-Ziv is an easy-to-compute member of a wide family of so-called macro schemes; it restricts pointers to go in one direction only. Optimal bidirectional macro schemes are NP-complete to find, but they may provide much better compression on highly repetitive sequences. We consider the problem of approximating optimal bidirectional macro schemes. We describe a simulated annealing algorithm that usually converges quickly. Moreover, in some cases, we obtain bidirectional macro schemes that are provably a 2-approximation of the optimal. We test our algorithm on a number of artificial repetitive texts and verify that it is efficient in practice and outperforms Lempel-Ziv, sometimes by a wide margin.
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。
