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arXiv 1301.3901cs.LGcs.AIstat.ML
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平均场理论与联合树算法之间的变分逼近

Variational Approximations between Mean Field Theory and the Junction Tree Algorithm

RWCP, Theoretical Foundation SNN, University of Nijmegen(RWCP、SNN 理论基础、奈梅亨大学)

Wim Wiegerinck

摘要:

近年来,变分近似,如平均场近似受到了极大的关注。我们扩展了标准的平均场方法,通过使用一个近似的分布,分解成集群潜力。这包括无向图,有向无环图和连接树。我们推导了优化团簇势的广义平均场方程。我们表明,该方法的桥梁之间的差距标准的平均场近似和精确的连接树算法。此外,我们解决的问题,如何选择的图形结构的近似分布。从广义平均场方程,我们推导出规则,以简化结构的近似分布在不影响质量的近似。我们还展示了该方法如何适合于目前流行的其他一些变分近似。

英文摘要:

Recently, variational approximations such as the mean field approximation have received much interest. We extend the standard mean field method by using an approximating distribution that factorises into cluster potentials. This includes undirected graphs, directed acyclic graphs and junction trees. We derive generalized mean field equations to optimize the cluster potentials. We show that the method bridges the gap between the standard mean field approximation and the exact junction tree algorithm. In addition, we address the problem of how to choose the graphical structure of the approximating distribution. From the generalised mean field equations we derive rules to simplify the structure of the approximating distribution in advance without affecting the quality of the approximation. We also show how the method fits into some other variational approximations that are currently popular.

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