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arXiv 2403.02660math.NAcs.NA
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一种无需逐分量构造的随机化格规则

A randomized lattice rule without component-by-component construction

Takashi Goda

AI总结:

针对加权Korobov空间周期函数积分问题,提出一种随机选择点数的随机化rank-1 lattice rule,通过随机多次选取并比较生成向量的最坏情况误差,免除了逐分量构造,以高概率实现近最优误差率。

摘要:

我们在随机化设定下研究加权Korobov空间中周期函数的多变量积分问题。我们提出了一种随机选择点数的新型随机化rank-1 lattice rule,它避免了在寻找优质生成向量时进行逐分量构造,同时仍能达到随机化误差的近最优收敛率。我们的核心思想是利用以下事实:在确定性设定下,至少有一半的可能生成向量能产生近最优化最坏情况误差的收敛率。通过随机选择生成向量$r$次并比较它们对应的最坏情况误差,能以极大概率找到一个满足期望最坏情况误差界的生成向量,且(较小的)失败概率可通过随点数对数增加$r$来控制。我们进行了数值实验以支持理论发现。

英文摘要:

We study the multivariate integration problem for periodic functions from the weighted Korobov space in the randomized setting. We introduce a new randomized rank-1 lattice rule with a randomly chosen number of points, which avoids the need for component-by-component construction in the search for good generating vectors while still achieving nearly the optimal rate of the randomized error. Our idea is to exploit the fact that at least half of the possible generating vectors yield nearly the optimal rate of the worst-case error in the deterministic setting. By randomly choosing generating vectors $r$ times and comparing their corresponding worst-case errors, one can find one generating vector with a desired worst-case error bound with a very high probability, and the (small) failure probability can be controlled by increasing $r$ logarithmically as a function of the number of points. Numerical experiments are conducted to support our theoretical findings.

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