Valuation-based System
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{{Notability, date=August 2022 Valuation-based system (VBS) is a framework for
knowledge representation Knowledge representation and reasoning (KRR, KR&R, KR²) is the field of artificial intelligence (AI) dedicated to representing information about the world in a form that a computer system can use to solve complex tasks such as diagnosing a medic ...
and inference. Real-world problems are modeled in this framework by a network of interrelated entities, called variables. The relationships between variables (possibly uncertain or imprecise) are represented by the functions called valuations. The two basic operations for performing inference in a VBS are combination and marginalization. Combination corresponds to the aggregation of knowledge, while marginalization refers to the focusing (coarsening) of it. VBSs were introduced by Prakash P.
Shenoy Shenoy is a surname from coastal Karnataka and Goa in India. It is found among Hindus of the Goud Saraswat Brahmin community following Smartha Sampradaya of Kavale Matha or Madhva Sampradaya of either Gokarna Matha or Kashi Matha. Some ...
in 1989 as general frameworks for managing uncertainty in
expert system In artificial intelligence, an expert system is a computer system emulating the decision-making ability of a human expert. Expert systems are designed to solve complex problems by reasoning through bodies of knowledge, represented mainly as if†...
s.


Applications

VBS are used for knowledge representation in expert systems and data fusion.


Bibliography

* Shenoy, Prakash P. A valuation-based language for expert systems. ''Int. Journal of Approximate Reasoning'', vol. 3, no. 2, pages 383–411, 1989. * Shenoy, Prakash P. Valuation based systems: A framework for managing uncertainty in expert systems. In L. A. Zadeh and J. Kacprzyk, editors, ''Fuzzy Logic and the Management of Uncertainty'', chapter 4, pages 83–104. Wiley, New York, 1992. * Shenoy, Prakash P. and Shafer, G. Axioms for probability and belief-function propagation. In J. Pearl G. Shafer, editor, ''Readings in uncertain reasoning'', pages 575–610. San Mateo, CA: Morgan Kaufmann, 1990.


External links


Application of VBS to a threat assessment problem
Logic