图 书 馆
智慧市场：管理网络社交用户智慧的新范式WiseMarket: A New Paradigm for Managing Wisdom of Online Social Users |
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| 课程网址: | http://videolectures.net/kdd2013_cao_wisemarket/ |
| 主讲教师: | Caleb Chen Cao |
| 开课单位: | 香港科技大学 |
| 开课时间: | 2013-09-27 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | The benefits of crowdsourcing are well-recognized today for an increasingly broad range of problems. Meanwhile, the rapid development of social media makes it possible to seek the wisdom of a crowd of targeted users. However, it is not trivial to implement the crowdsourcing platform on social media, specifically to make social media users as workers, we need to address the following two challenges: 1) how to motivate users to participate in tasks, and 2) how to choose users for a task. In this paper, we present Wise Market as an effective framework for crowdsourcing on social media that motivates users to participate in a task with care and correctly aggregates their opinions on pairwise choice problems. The Wise Market consists of a set of investors each with an associated individual confidence in his/her prediction, and after the investment, only the ones whose choices are the same as the whole market are granted rewards. Therefore, a social media user has to give his/her ``best'' answer in order to get rewards, as a consequence, careless answers from sloppy users are discouraged. Under the Wise Market framework, we define an optimization problem to minimize expected cost of paying out rewards while guaranteeing a minimum confidence level, called the Effective Market Problem (EMP). We propose exact algorithms for calculating the market confidence and the expected cost with O(nlog2n) time cost in a Wise Market with n investors. To deal with the enormous number of users on social media, we design a Central Limit Theorem-based approximation algorithm to compute the market confidence with O(n) time cost, as well as a bounded approximation algorithm to calculate the expected cost with O(n) time cost. Finally, we have conducted extensive experiments to validate effectiveness of the proposed algorithms on real and synthetic data. |
| 关 键 词: | 市场框架; 智慧市场; 社交网络 |
| 课程来源: | 视频讲座网 |
| 数据采集: | 2023-06-12：chenxin01 |
| 最后编审: | 2023-06-12：chenxin01 |
| 阅读次数: | 22 |