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arXiv 1102.3340cs.SIcs.DSphysics.soc-ph
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基于Denmark子图的多技能协作团队

Multi-skill Collaborative Teams based on Densest Subgraphs

Amita Gajewar, Atish Das Sarma

摘要:

我们考虑的问题,确定一个团队的技术人员的合作,在存在的社会网络。社交网络中的每个节点可以是一个或多个技能的专家。边权重指定相应节点之间的亲和性或协作兼容性。给定一个项目,需要一组指定数量的技术人员在每个专业领域,目标是确定一个团队,最大限度地提高合作的兼容性。例如,要求可以是形成具有至少三个数据库专家和至少两个理论专家的团队。我们探讨团队的形成,其中的协作兼容性目标是衡量的密度所选节点上的诱导子图。最大化密度的问题是NP难的,即使团队只需要一种技能的个人。我们提出了一个3-近似算法,提高了一个天真的扩展以前已知的算法denominating至少$k$子图的问题。我们进一步展示了如何将相同的近似扩展到多个技能的特殊情况。我们的问题推广了Lappas等人研究的公式。[KDD '09]他们用直径或生成树成本来衡量团队兼容性。实验进行爬行的DBLP图,其中个人可以熟练在最多四个领域-理论,数据库,数据采掘和人工智能。除了我们的主要算法,我们还提出了启发式扩展之间的权衡解决方案的大小和诱导密度。这些基于密度的算法优于直径为基础的目标上的几个指标评估团队的协作兼容性。所建议的解决方案也具有直观的意义,并且随着所需技术人员数量的增加而扩大。

英文摘要:

We consider the problem of identifying a team of skilled individuals for collaboration, in the presence of a social network. Each node in the social network may be an expert in one or more skills. Edge weights specify affinity or collaborative compatibility between respective nodes. Given a project that requires a set of specified number of skilled individuals in each area of expertise, the goal is to identify a team that maximizes the collaborative compatibility. For example, the requirement may be to form a team that has at least three databases experts and at least two theory experts. We explore team formation where the collaborative compatibility objective is measured as the density of the induced subgraph on selected nodes. The problem of maximizing density is NP-hard even when the team requires individuals of only one skill. We present a 3-approximation algorithm that improves upon a naive extension of the previously known algorithm for densest at least $k$ subgraph problem. We further show how the same approximation can be extended to a special case of multiple skills. Our problem generalizes the formulation studied by Lappas et al. [KDD '09] who measure team compatibility in terms of diameter or spanning tree costs. Experiments are performed on a crawl of the DBLP graph where individuals can be skilled in at most four areas - theory, databases, data mining, and artificial intelligence. In addition to our main algorithm, we also present heuristic extensions to trade off between the size of the solution and its induced density. These density-based algorithms outperform the diameter-based objective on several metrics for assessing the collaborative compatibility of teams. The solutions suggested are also intuitively meaningful and scale well with the increase in the number of skilled individuals required.

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