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Norm statistics and the complexity of clustering problems

机译:规范统计和聚类问题的复杂性

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In this paper we introduce a new class of clustering problems. These are similar to certain classical problems but involve a novel combination of l(p)-statistics and l(q) norms. We discuss a real world application in which the case p = 2 and q = 1 arises in a natural way. We show that, even for one dimension, such problems are NP-hard, which is surprising because the same 1-dimensional problems for the 'pure' l(2)-statistic and l(2) norm are known to satisfy a 'string property' and can be solved in polynomial time. We generalize the string property for the case p = q. The string property need not hold when q <= p - 1 and we show that instances may be constructed, for which the best solution satisfying the string property does arbitrarily poorly. We state some open problems and conjectures.
机译:在本文中,我们介绍了一类新的聚类问题。这些类似于某些经典问题,但涉及l(p)-统计量和l(q)范数的新颖组合。我们讨论了一个现实世界的应用,其中p = 2和q = 1的情况很自然地出现。我们表明,即使对于一维,此类问题也是NP难的,这是令人惊讶的,因为已知“纯” l(2)-统计量和l(2)范数的相同一维问题都满足“字符串”属性”,可以在多项式时间内求解。对于p = q的情况,我们推广了字符串属性。当q <= p-1时,字符串属性不必成立,我们证明可以构造实例,对于这些实例,满足字符串属性的最佳解决方案的表现会很差。我们陈述一些未解决的问题和猜想。

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