Approximate Lifted Inference with Probabilistic Databases
Approximate Lifted Inference with Probabilistic Databases
复制标题
使用概率数据库进行近似提升推理
DOI:
10.14778/2735479.2735494
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Dan Suciu
中科院分区:
文献类型:
--
作者:
Wolfgang Gatterbauer;Dan Suciu
This paper proposes a new approach for approximate evaluation of #P-hard queries with probabilistic databases. In our approach, every query is evaluated entirely in the database engine by evaluating a fixed number of query plans, each providing an upper bound on the true probability, then taking their minimum. We provide an algorithm that takes into account important schema information to enumerate only the minimal necessary plans among all possible plans. Importantly, this algorithm is a strict generalization of all known results of PTIME self-join-free conjunctive queries: A query is safe if and only if our algorithm returns one single plan. We also apply three relational query optimization techniques to evaluate all minimal safe plans very fast. We give a detailed experimental evaluation of our approach and, in the process, provide a new way of thinking about the value of probabilistic methods over non-probabilistic methods for ranking query answers.
影响因子:
14.4
作者:
Hoffart, Johannes;Suchanek, Fabian M.;Weikum, Gerhard
通讯作者:
Weikum, Gerhard