Isolation-Sensitive Task Assignment in Spatial Crowdsourcing

doi:10.3778/j.issn.1002-8331.2309-0118

Abstract

Abstract: With the popularity of mobile Internet access and the growth of the sharing economy, space crowdsourcing platforms have gained in widespread popularity. There exists a class of crowdsourcing applications that tries to make the crowdsourcing tasks spatially localized in scope, which is to reduce the movement of people between spatial regions when performing spatial tasks. Based on this requirement, this paper presents the spatially isolation-sensitive task matching problem, which minimizes the sum of the cross-regional costs incurred by the movement of workers for all matched tasks, given the set of workers and the set of tasks with the locations of the spatial regions to which they belong, provided that all tasks can be completed. Efficient spatial isolation-sensitive task assignment algorithms in online platforms are the research objectives. This paper proposes matching algorithm based on spatial hierarchical merging and grouping, which transforms tasks and workers distributed in spatial regions to regional adjacency graph nodes, proposes the concept of [δ]-clique for grouping regional nodes, and then performs overall matching of grouped nodes, which improves the efficiency of the matching algorithm to a greater extent. Finally, the effectiveness of the proposed algorithm is verified by conducting full comparison experiments on real datasets in terms of both cross-region cost and running time, which the proposed algorithms reduce cross regional costs by an average of nearly 16% and improve matching efficiency by an average of nearly 5 times.

Key words: spatial crowdsourcing, regional division, cross region cost, Kuhn-Munkres (KM) algorithm

摘要： 随着移动互联网接入普及和共享经济的增长，空间众包平台得到广泛普及。存在一类众包应用尽量使得众包任务在空间局部范围内完成，即在执行空间任务时减少人员在空间区域间的流动。基于此需求，提出了空间隔离敏感的任务匹配问题，给定具有所属空间区域位置的工人集和任务集，在所有任务均可完成的前提下，使得所有匹配任务的工人移动所产生的跨区域代价之和最小。在线平台中高效的空间隔离敏感的任务匹配算法是研究目标。提出了基于空间层次合并分组的匹配算法，将分布在空间区域中的任务与工人转换到区域邻接图节点，提出了[δ]-clique概念用于将区域节点分组，对分组的节点进行整体匹配，较大程度上提高了匹配算法的效率。在真实数据集上进行充分对比实验，结果表明，与现有的算法相比提出的空间层次合并分组的匹配算法在跨区域代价方面平均减少近16%，在匹配效率方面平均提升近5倍，验证了所提出算法的有效性。

关键词: 空间众包, 区域划分, 跨区域代价, KM算法

LIU Junling, GAO Xinyu, SUN Huanliang, XU Jingke. Isolation-Sensitive Task Assignment in Spatial Crowdsourcing[J]. Computer Engineering and Applications, 204, 60(17): 252-262.

刘俊岭, 高新宇, 孙焕良, 许景科. 空间众包中隔离敏感的任务匹配算法[J]. 计算机工程与应用, 204, 60(17): 252-262.

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