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Reducing the Cost of Aggregation in Crowdsourcing

Rituraj Singh 1 Loïc Hélouët 2 Zoltan Miklos 1
2 SUMO - SUpervision of large MOdular and distributed systems
Inria Rennes – Bretagne Atlantique , IRISA-D4 - LANGAGE ET GÉNIE LOGICIEL
Abstract : Crowdsourcing is a way to solve problems that need human contribution. Crowdsourcing platforms distribute replicated tasks to workers, pay them for their contribution, and aggregate answers to produce a reliable conclusion. A fundamental problem is to infer a correct answer from the set of returned results. Another challenge is to obtain a reliable answer at a reasonable cost: unlimited budget allows hiring experts or large pools of workers for each task but a limited budget forces to use resources at best. This paper considers crowdsourcing of simple boolean tasks. We first define a probabilistic inference technique, that considers difficulty of tasks and expertise of workers when aggregating answers. We then propose CrowdInc, a greedy algorithm that reduce the cost needed to reach a consensual answer. CrowdInc distributes resources dynamically to tasks according to their difficulty. We show on several benchmarks that CrowdInc achieves good accuracy, reduces costs, and we compare its performance to existing solutions.
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https://hal.inria.fr/hal-02964718
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Submitted on : Monday, October 12, 2020 - 4:22:55 PM
Last modification on : Monday, October 19, 2020 - 10:54:20 AM

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Rituraj Singh, Loïc Hélouët, Zoltan Miklos. Reducing the Cost of Aggregation in Crowdsourcing. Web Services - (ICWS) 2020 - 27th International Conference, Sep 2020, Honolulu, United States. ⟨10.1007/978-3-030-59618-7⟩. ⟨hal-02964718⟩

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