Generalized roof duality and bisubmodular functions
Kolmogorov, Vladimir
Consider a convex relaxation f̂ of a pseudo-Boolean function f. We say that the relaxation is totally half-integral if f̂(x) is a polyhedral function with half-integral extreme points x, and this property is preserved after adding an arbitrary combination of constraints of the form x i=x j, x i=1-x j, and x i=γ where γ∈{0,1,1/2} is a constant. A well-known example is the roof duality relaxation for quadratic pseudo-Boolean functions f. We argue that total half-integrality is a natural requirement for generalizations of roof duality to arbitrary pseudo-Boolean functions. Our contributions are as follows. First, we provide a complete characterization of totally half-integral relaxations f̂ by establishing a one-to-one correspondence with bisubmodular functions. Second, we give a new characterization of bisubmodular functions. Finally, we show some relationships between general totally half-integral relaxations and relaxations based on the roof duality. On the conceptual level, our results show that bisubmodular functions provide a natural generalization of the roof duality approach to higher-order terms. This can be viewed as a non-submodular analogue of the fact that submodular functions generalize the s-t minimum cut problem with non-negative weights to higher-order terms.
Elsevier
2012
info:eu-repo/semantics/article
doc-type:article
text
https://research-explorer.app.ist.ac.at/record/3257
Kolmogorov V. Generalized roof duality and bisubmodular functions. <i>Discrete Applied Mathematics</i>. 2012;160(4-5):416-426. doi:<a href="https://doi.org/10.1016/j.dam.2011.10.026">10.1016/j.dam.2011.10.026</a>
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dam.2011.10.026
info:eu-repo/semantics/altIdentifier/arxiv/1005.2305
info:eu-repo/semantics/openAccess