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  • Computing Shapley values in the plane
    Cabello, Sergio ; Chan, Timothy M.
    We consider the problem of computing Shapley values for points in the plane, where each point is interpreted as a player, and the value of a coalition is defined by the area of usual geometric ... objects, such as the convex hull or the minimum axis-parallel bounding box. For sets of $n$ points in the plane, we show how to compute in roughly ▫$O(n^{3/2})$▫ time the Shapley values for the area of the minimum axis-parallel bounding box and the area of the union of the rectangles spanned by the origin and the input points. When the points form an increasing or decreasing chain, the running time can be improved to near-linear. In all these cases, we use linearity of the Shapley values and algebraic methods. We also show that Shapley values for the area of the convex hull or the minimum enclosing disk can be computed in ▫$O(n^2)$▫ and ▫$O(n^3)$▫ time, respectively. These problems are closely related to the model of stochastic point sets considered in computational geometry, but here we have to consider random insertion orders of the points instead of a probabilistic existence of points.
    Source: Discrete & computational geometry. - ISSN 0179-5376 (Vol. 67, iss. 3, Apr. 2022, str. 843-881)
    Type of material - article, component part ; adult, serious
    Publish date - 2022
    Language - english
    COBISS.SI-ID - 99467779

    Link(s):

    https://link.springer.com/article/10.1007/s00454-021-00368-3
    DOI

source: Discrete & computational geometry. - ISSN 0179-5376 (Vol. 67, iss. 3, Apr. 2022, str. 843-881)
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