arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1302.3602cs.AI
收藏

贝叶斯网络中的抽样累积信念更新算法

Sample-and-Accumulate Algorithms for Belief Updating in Bayes Networks

Eugene Santos, Solomon Eyal Shimony, Edward Williams

摘要:

贝叶斯网中的信念更新是一个众所周知的计算困难的问题,最近已经被几种确定性算法和各种随机近似算法所近似。确定性算法通常提供概率界,但具有指数运行时间。一些随机化方案具有多项式运行时间,但仅提供概率估计。我们提出了随机算法,枚举高概率的部分实例,从而在概率界。这些算法中的一些也是采样算法。具体来说,我们介绍和评估的一个变种的后向采样,作为一个采样算法和随机枚举算法。我们还放松了采样和累积算法所使用的隐式假设,即查询节点必须在所有样本中实例化。

英文摘要:

Belief updating in Bayes nets, a well known computationally hard problem, has recently been approximated by several deterministic algorithms, and by various randomized approximation algorithms. Deterministic algorithms usually provide probability bounds, but have an exponential runtime. Some randomized schemes have a polynomial runtime, but provide only probability estimates. We present randomized algorithms that enumerate high-probability partial instantiations, resulting in probability bounds. Some of these algorithms are also sampling algorithms. Specifically, we introduce and evaluate a variant of backward sampling, both as a sampling algorithm and as a randomized enumeration algorithm. We also relax the implicit assumption used by both sampling and accumulation algorithms, that query nodes must be instantiated in all the samples.

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。

↑