Open-world probabilistic databases: Semantics, algorithms, complexity
Open-world probabilistic databases: Semantics, algorithms, complexity
复制标题
开放世界的概率数据库:语义、算法、复杂性
DOI:
10.1016/j.artint.2021.103474
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发表时间:
2021
影响因子:
14.4
通讯作者:
Van den Broeck, Guy
中科院分区:
文献类型:
--
作者:
Ceylan, İsmail İlkan;Darwiche, Adnan;Van den Broeck, Guy
Large-scale probabilistic knowledge bases are becoming increasingly important in academia and industry. They are continuously extended with new data, powered by modern information extraction tools that associate probabilities with knowledge base facts. The state of the art to store and process such data is founded on probabilistic databases. Many systems based on probabilistic databases, however, still have certain semantic deficiencies, which limit their potential applications. We revisit the semantics of probabilistic databases, and argue that theclosed-world assumptionof probabilistic databases, i.e., the assumption that facts not appearing in the database have the probabilityzero, conflicts with the everyday use of large-scale probabilistic knowledge bases. To address this discrepancy, we proposeopen-world probabilistic databases, as a new probabilistic data model. In this new data model, the probabilities of unknown facts, also calledopen facts, can be assigned any probability value from a default probability interval. Our analysis entails that our model aligns better with many real-world tasks such asquery answering,relational learning,knowledge base completion, andrule mining. We make various technical contributions. We show that thedata complexity dichotomy, between polynomial time and , for evaluating unions of conjunctive queries on probabilistic databases can be lifted to our open-world model. This result is supported by an algorithm that computes the probabilities of the so-calledsafequeries efficiently. Based on this algorithm, we prove that evaluating safe queries is inlinear timefor probabilistic databases, under reasonable assumptions. This remains true in open-world probabilistic databases for a more restricted class of safe queries. We extend our data complexity analysis beyond unions of conjunctive queries, and obtain a host of complexity results for both classical and open-world probabilistic databases. We conclude our analysis with an in-depth investigation of thecombined complexityin the respective models.
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DOI:
--
发表时间:
2005
期刊:
International Joint Conference on Artificial Intelligence
影响因子:
--
作者:
Cassio Polpo de Campos;Fabio Gagliardi Cozman
通讯作者:
Fabio Gagliardi Cozman
DOI:
10.24963/ijcai.2017/669
发表时间:
2017
期刊:
Proceedings of the 2018 International Conference on Management of Data
影响因子:
--
作者:
I. Ceylan;Adnan Darwiche;Guy Van den Broeck
通讯作者:
Guy Van den Broeck
影响因子:
3.1
作者:
Kuldeep S. Meel;Aditya A. Shrotri;Moshe Y. Vardi
通讯作者:
Moshe Y. Vardi
DOI:
10.1145/1989323.1989481
发表时间:
2011
期刊:
ACM Trans. Database Syst.
影响因子:
--
作者:
Robert Fink;A. Hogue;Dan Olteanu;Swaroop Rath
通讯作者:
Swaroop Rath
DOI:
10.1609/aaai.v34i04.5705
发表时间:
2019-04
期刊:
--
影响因子:
--
作者:
Ralph Abboud;I. Ceylan;Thomas Lukasiewicz
通讯作者:
Ralph Abboud;I. Ceylan;Thomas Lukasiewicz