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Spherical coverage verification

机译:球面覆盖验证

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摘要

We consider the problem of covering hypersphere by a set of spherical hypercaps. This sort of problem has numerous practical applications such as error correcting codes and reverse k-nearest neighbor problem. Using the reduction of non-degenerated concave quadratic programming (QP) problem, we demonstrate that spherical coverage verification is NP hard. We propose a recursive algorithm based on reducing the problem to several lower dimension subproblems. We test the performance of the proposed algorithm on a number of generated constellations. We demonstrate that the proposed algorithm, in spite of its exponential worst-case complexity, is applicable in practice. In contrast, our results indicate that spherical coverage verification using QP solvers that utilize heuristics, due to numerical instability, may produce false positives.
机译:我们考虑用一组球面超上限覆盖超球面的问题。这类问题有许多实际应用,例如纠错码和反向k最近邻问题。使用非退化凹二次规划(QP)问题的减少,我们证明球面覆盖验证是NP困难的。我们提出了一种基于递归算法,将问题减少到几个较低维度的子问题。我们在许多生成的星座图上测试了所提出算法的性能。我们证明了所提出的算法尽管具有指数级的最坏情况复杂度,但仍可在实践中应用。相反,我们的结果表明,由于数值不稳定,使用利用启发式方法的QP求解器进行的球形覆盖范围验证可能会产生假阳性。

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