图 书 馆
非随机缺失数据推荐系统的培训和测试Training and Testing of Recommender Systems on Data Missing Not at Random |
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| 课程网址: | http://videolectures.net/kdd2010_steck_ttrs/ |
| 主讲教师: | Harald Steck |
| 开课单位: | 贝尔实验室 |
| 开课时间: | 2010-10-01 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | Users typically rate only a small fraction of all available items. We show that the absence of ratings carries useful information for improving the top-k hit rate concerning all items, a natural accuracy measure for recommendations. As to test recommender systems, we present two performance measures that can be estimated, under mild assumptions, without bias from data even when ratings are missing not at random (MNAR). As to achieve optimal test results, we present appropriate surrogate objective functions for efficient training on MNAR data. Their main property is to account for all ratings--whether observed or missing in the data. Concerning the top-k hit rate on test data, our experiments indicate dramatic improvements over even sophisticated methods that are optimized on observed ratings only. |
| 关 键 词: | 可用项目; 评级; 命中率 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-07-17：yumf |
| 阅读次数: | 73 |