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PLSI︰ 真正的费舍尔内核和超越PLSI: The True Fisher Kernel and Beyond |
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| 课程网址: | http://videolectures.net/ecmlpkdd09_eckard_plsitfkb/ |
| 主讲教师: | Emmanuel Eckard |
| 开课单位: | 洛桑联邦理工学院 |
| 开课时间: | 信息不详。欢迎您在右侧留言补充。 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | The Probabilistic Latent Semantic Indexing model, introduced by T. Hofmann (1999), has engendered applications in numerous fields, notably document classification and information retrieval. In this context, the Fisher kernel was found to be an appropriate document similarity measure. However, the kernels published so far contain unjustified features, some of which hinder their performances. Furthermore, PLSI is not generative for unknown documents, a shortcoming usually remedied by ”folding them in” the PLSI parameter space. This paper contributes on both points by (1) introducing a new, rigorous development of the Fisher kernel for PLSI, addressing the role of the Fisher Information Matrix, and uncovering its relation to the kernels proposed so far; and (2) proposing a novel and theoretically sound document similarity, which avoids the problem of ”folding in” unknown documents. For both aspects, experimental results are provided on several information retrieval evaluation sets. |
| 关 键 词: | 费舍尔内核; 文本挖掘; 文档分类; 信息检索 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2019-12-05：cwx |
| 阅读次数: | 59 |