图 书 馆
活跃的学习：改变被动为主动改进标签的复杂性Activized Learning: Transforming Passive to Active with Improved Label Complexity |
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| 课程网址: | http://videolectures.net/cmulls08_hanneke_altp/ |
| 主讲教师: | Steve Hanneke |
| 开课单位: | 卡内基梅隆大学 |
| 开课时间: | 2009-01-15 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | In active learning, a learning algorithm is given access to a large pool of unlabeled examples, and is allowed to request the labels of any particular examples in that pool, interactively. In empirically driven research, one of the most common techniques for designing new active learning algorithms is to use an existing passive learning algorithm as a subroutine, and actively construct a training set for that method by carefully choosing informative examples to label. The resulting active learning algorithms are thus able to inherit the tried-and-true learning bias of the underlying passive algorithm, while often requiring significantly fewer labels to achieve a given accuracy compared to random sampling. This naturally raises the theoretical question of whether every passive learning algorithm can be "activized", or transformed into an active learning algorithm that uses a smaller number of labels to achieve a given accuracy. In this talk, I will address precisely this question. In particular, I will explain how to use any passive learning algorithm as a subroutine to construct an active learning algorithm that provably achieves a strictly superior asymptotic label complexity. Along the way, I will also describe many of the recent advances in the formal study of the potential benefits of active learning in general. |
| 关 键 词: | 计算机科学; 机器学习; 主动学习 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-06-05：魏雪琼(课程编辑志愿者) |
| 阅读次数: | 36 |