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ACM Doctoral Dissertation Award - Default Reasoning - Causal And Conditional Theories (Cód: 9056605)

Geffner,Hector

Mit Press

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ACM Doctoral Dissertation Award - Default Reasoning - Causal And Conditional Theories

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Descrição

Defaults in commonsense reasoning permit the generation of useful predictions in the absence of complete information. However, attempts to represent and reason with defaults in Al run into the problem of spurious arguments, arguments that rely on acceptable defaults but which support unacceptable conclusions. Geffner addresses this problem by analyzing the causal and conditional aspects of default, establishing clear theoretical limits on the capabilities of probabilistic approaches. He provides new insights into the nature of defaults, and new methods of processing databases containing default expressions. The result is a powerful default-handling system that yields an intuitive behavior in several domains of interest in AI, including inheritance hierarchies, reasoning about change, general logic programs, and abductive reasoning.Geffner develops an axiomatic system based on a probabilistic and a model-theoretic semantics in which defaults are regarded as assertions whose truth or likelihood is bound to a particular context. He contrasts these conditional interpretations with standard extensional interpretations, and notes that while the former properly resolve arguments of different 'specificity,' the latter properly account for arguments involving 'independence' assumptions. Geffner then combines the best features of both interpretations into a more powerful account of default reasoning which he calls conditional entailment. Conditional entailment is based on an ordering of defaults extracted from the knowledge base and can be computed by an elegant argument system, in which arguments of different strength interact, and strongest arguments 'win.' This system can be extended with a causal operator and suitable coherence considerations to provide an adequate solution to many problems involving causation and abduction.Hector Geffner is Research Staff Member at IBM's T. J. Watson Research Center. He received his doctoral degree from the University of California, Los Angeles.Contents: Introduction. A System of Defeasible Inference Based on Probabilities. High Probabilities and Preferential Structures. Irrelevance and Prioritized Preferential Structures. The Causal Dimension: Evidence vs. Explanation. Conclusions. Proofs.

Características

Produto sob encomenda Sim
Marca Mit Press
Cód. Barras 9780262519083
Altura 23.50 cm
I.S.B.N. 9780262519083
Profundidade 1.27 cm
Referência 023696413
Acabamento Brochura
Ano da edição 1992
Idioma Inglês
Número de Páginas 236
Peso 0.42 Kg
Largura 19.05 cm
AutorGeffner,Hector