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arXiv 1701.07572math.STstat.TH
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非线性隐变量模型的自适应后验收敛速度

Adaptive posterior convergence rates in non-linear latent variable models

Shuang Zhou, Debdeep Pati, Anirban Bhattacharya, David Dunson

摘要:

非线性潜变量模型在各种应用中变得越来越流行。然而,对这些模型的理论性质的研究却很少。本文研究了一类非线性潜变量模型的单变量密度估计的后验收缩率,其中U(0,1)潜变量与响应变量通过带可加误差的随机非线性回归相关.我们的方法依赖于将由上述模型引起的密度空间表征为具有一般类连续混合测度的核卷积。关于密度估计中后验收缩率的文献几乎全部集中在有限或可数无限混合模型上。我们发展我们的连续混合措施类的近似结果。在未知的回归函数上使用适当的高斯过程先验,在真密度上的标准正则性条件下,我们得到了最优的对数因子的频率论速率。

英文摘要:

Non-linear latent variable models have become increasingly popular in a variety of applications. However, there has been little study on theoretical properties of these models. In this article, we study rates of posterior contraction in univariate density estimation for a class of non-linear latent variable models where unobserved U(0,1) latent variables are related to the response variables via a random non-linear regression with an additive error. Our approach relies on characterizing the space of densities induced by the above model as kernel convolutions with a general class of continuous mixing measures. The literature on posterior rates of contraction in density estimation almost entirely focuses on finite or countably infinite mixture models. We develop approximation results for our class of continuous mixing measures. Using an appropriate Gaussian process prior on the unknown regression function, we obtain the optimal frequentist rate up to a logarithmic factor under standard regularity conditions on the true density.

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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