论文标题
与嘈杂查询的图形连接性
Graph Connectivity with Noisy Queries
论文作者
论文摘要
图形连接性是在许多实际应用中出现的基本组合优化问题,通常将网络的子图用于其操作。但是,在现实世界中,链接可能会出乎意料地认为网络非运营,同时检查链接是否损坏是昂贵且可能是错误的。在损坏了边缘任意子集的事件之后,网络运营商必须使用未损坏的边缘来找到网络的生成树,通过进行尽可能少的检查。 在此类问题的激励下,我们研究了在网络中找到一棵生成树的问题,当我们只能访问“ Edge E存在?”形式的嘈杂查询。我们设计有效的算法,即使边缘在对手方面失败,也为所有可能的错误制度。 2个方面的错误(任何答案可能是错误的),误报(“否”答案总是正确的)和误报(其中“是”答案始终是正确的)。在前两个方案中,我们提供有效的算法,并为一般图提供匹配的下限。在错误的否定案例中,我们为大型有趣的图形系列设计有效的算法(例如有界树宽,稀疏)。使用先前的结果,我们为所有错误制度中实际上有用的平面图家族提供了紧密的算法。
Graph connectivity is a fundamental combinatorial optimization problem that arises in many practical applications, where usually a spanning subgraph of a network is used for its operation. However, in the real world, links may fail unexpectedly deeming the networks non-operational, while checking whether a link is damaged is costly and possibly erroneous. After an event that has damaged an arbitrary subset of the edges, the network operator must find a spanning tree of the network using non-damaged edges by making as few checks as possible. Motivated by such questions, we study the problem of finding a spanning tree in a network, when we only have access to noisy queries of the form "Does edge e exist?". We design efficient algorithms, even when edges fail adversarially, for all possible error regimes; 2-sided error (where any answer might be erroneous), false positives (where "no" answers are always correct) and false negatives (where "yes" answers are always correct). In the first two regimes we provide efficient algorithms and give matching lower bounds for general graphs. In the False Negative case we design efficient algorithms for large interesting families of graphs (e.g. bounded treewidth, sparse). Using the previous results, we provide tight algorithms for the practically useful family of planar graphs in all error regimes.