Beta Probabilistic Databases: A Scalable Approach to Belief Updating and Parameter Learning
Beta Probabilistic Databases: A Scalable Approach to Belief Updating and Parameter Learning
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Beta 概率数据库:一种可扩展的置信更新和参数学习方法
DOI:
10.1145/3035918.3064026
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Gatterbauer, Wolfgang
中科院分区:
文献类型:
--
作者:
Meneghetti, Niccolo';Kennedy, Oliver;Gatterbauer, Wolfgang
Tuple-independent probabilistic databases (TI-PDBs) handle uncertainty by annotating each tuple with a probability parameter; when the user submits a query, the database derives the marginal probabilities of each output-tuple, assuming input-tuples are statistically independent. While query processing in TI-PDBs has been studied extensively, limited research has been dedicated to the problems ofupdating or deriving the parameters from observations of query results. Addressing this problem is the main focus of this paper. We introduceBeta Probabilistic Databases(B-PDBs), a generalization of TI-PDBs designed to support both (i)belief updatingand (ii)parameter learningin a principled and scalable way. The key idea of B-PDBs is to treat each parameter as a latent, Beta-distributed random variable. We show how this simple expedient enables both belief updating and parameter learning in a principled way, without imposing any burden on regular query processing. We use this model to provide the following key contributions: (i) we show how to scalably compute the posterior densities of the parameters given new evidence; (ii) we study the complexity of performing Bayesian belief updates, devising efficient algorithms for tractable classes of queries; (iii) we propose a soft-EM algorithm for computing maximum-likelihood estimates of the parameters; (iv) we show how to embed the proposed algorithms into a standard relational engine; (v) we support our conclusions with extensive experimental results.
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期刊:
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影响因子:
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发表时间:
2011
期刊:
ACM SIGMOD Conference
影响因子:
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