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 1302.4969cs.AI
收藏

灵敏度:贝叶斯信度网络中条件概率的替代方法

Sensitivities: An Alternative to Conditional Probabilities for Bayesian Belief Networks

Stanford University(斯坦福大学);Princeton University(普林斯顿大学)

Alexander V. Kozlov, Jaswinder Pal Singh

摘要:

我们展示了另一种方法表示贝叶斯信念网络的灵敏度和概率分布。这种表示等价于传统的条件概率表示,但使节点之间的依赖性明显,直观上易于理解。我们还提出了一个QR矩阵表示的灵敏度和/或条件概率,这是更有效的,在内存需求和计算速度,比传统的表示基于计算机的概率推理的实现。我们使用灵敏度表明,对于某一类二进制网络,近似概率推理的计算时间与结果误差的任何正上限无关。最后,作为一种替代传统的算法,使用条件概率,我们描述了一个精确的概率推理算法,使用QR表示的敏感性和更新的概率分布的节点在网络中根据来自邻居的消息。

英文摘要:

We show an alternative way of representing a Bayesian belief network by sensitivities and probability distributions. This representation is equivalent to the traditional representation by conditional probabilities, but makes dependencies between nodes apparent and intuitively easy to understand. We also propose a QR matrix representation for the sensitivities and/or conditional probabilities which is more efficient, in both memory requirements and computational speed, than the traditional representation for computer-based implementations of probabilistic inference. We use sensitivities to show that for a certain class of binary networks, the computation time for approximate probabilistic inference with any positive upper bound on the error of the result is independent of the size of the network. Finally, as an alternative to traditional algorithms that use conditional probabilities, we describe an exact algorithm for probabilistic inference that uses the QR-representation for sensitivities and updates probability distributions of nodes in a network according to messages from the neighbors.

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。

↑