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The Characteristic Imset Polytope Of Bayesian Networks With Ordered Nodes, Jing Xi, Ruriko Yoshida
The Characteristic Imset Polytope Of Bayesian Networks With Ordered Nodes, Jing Xi, Ruriko Yoshida
Statistics Faculty Publications
In 2010, M. Studený, R. Hemmecke, and S. Lindner explored a new algebraic description of graphical models, called characteristic imsets. Compared with standard imsets, characteristic imsets have several advantages: they are still unique vector representatives of conditional independence structures, 0-1 vectors, and more intuitive in terms of graphs than standard imsets. After defining a characteristic imset polytope (cim-polytope) as the convex hull of all characteristic imsets with a given set of nodes, they also showed that a model selection in graphical models, which maximizes a quality criterion, can be converted into a linear programming problem over the cim-polytope. However, in …