Polynomial Time Approximate Sampler for Discretized Dirichlet Distribution
Polynomial Time Approximate Sampler for Discretized Dirichlet Distribution
复制标题
离散狄利克雷分布的多项式时间近似采样器
DOI:
10.1007/978-3-540-24587-2_69
复制
发表时间:
2003
期刊:
影响因子:
3.9
通讯作者:
N. Kamatani
中科院分区:
文献类型:
--
作者:
Tomomi Matsui;Mitsuo Motoki;N. Kamatani
In this paper, we propose a Markov chain for sampling a random vector distributed according to a discretized Dirichlet distribution. We show that our Markov chain is rapidly mixing, that is, the mixing time of our chain is bounded by (1/2)n(n - 1)ln((δ - n)e − 1) where n is the dimension (the number of parameters), 1/Δ is the grid size for discretization, and e is the error bound. Thus the obtained bound does not depend on the magnitudes of parameters and linear to the logarithm of the inverse of grid size. We estimate the mixing time by using the path coupling method. We also show the rate of convergence of our chain experimentally.
影响因子:
9.8
作者:
Niu, TH;Qin, ZHS;Liu, JS
通讯作者:
Liu, JS