arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1509.07985stat.CO
收藏

固定节点数的自适应拒绝抽样

Adaptive Rejection Sampling with fixed number of nodes

L. Martino, F. Louzada

摘要:

自适应拒绝抽样(ARS)算法是一种通用的随机发生器,用于从单变量对数凹目标概率密度函数(pdf)中有效地抽取样本。ARS通过具有高接受率的拒绝抽样从目标生成独立样本。事实上,ARS产生一系列向目标pdf收敛的建议函数,因此接受样本的概率接近1。然而,每次更新时,从建议pdf中采样变得更具计算性。在这项工作中,我们提出了一种新的ARS计划,称为廉价的自适应拒绝抽样(CARS),其中的计算工作量从该提案中绘制保持不变,提前由用户决定。对于生成大量所需的样本,CARS比ARS更快。

英文摘要:

The adaptive rejection sampling (ARS) algorithm is a universal random generator for drawing samples efficiently from a univariate log-concave target probability density function (pdf). ARS generates independent samples from the target via rejection sampling with high acceptance rates. Indeed, ARS yields a sequence of proposal functions that converge toward the target pdf, so that the probability of accepting a sample approaches one. However, sampling from the proposal pdf becomes more computational demanding each time it is updated. In this work, we propose a novel ARS scheme, called Cheap Adaptive Rejection Sampling (CARS), where the computational effort for drawing from the proposal remains constant, decided in advance by the user. For generating a large number of desired samples, CARS is faster than ARS.

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。

↑