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arXiv 1404.4606cs.LGcs.CLcs.IR
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有多少个主题?话题模型的稳定性分析

How Many Topics? Stability Analysis for Topic Models

University College Dublin(都柏林大学学院)

Derek Greene, Derek O'Callaghan, Pádraig Cunningham

摘要:

主题建模是指在文本语料库中发现潜在的主题结构的任务,其中输出通常呈现为每个主题中出现的顶部术语的报告。尽管已经提出的主题建模算法的多样性,成功地应用这些技术的一个共同的挑战是为给定的语料库选择适当数量的主题。选择太少的主题会产生过于宽泛的结果,而选择太多的主题会导致语料库的“过度聚类”,成为许多小的,高度相似的主题。在本文中,我们提出了一个以术语为中心的稳定性分析策略来解决这个问题,其想法是,具有适当数量的主题的模型将对数据中的扰动更具鲁棒性。使用基于矩阵分解的主题建模方法,在一系列语料库上进行的评估表明,该策略可以成功地指导模型选择过程。

英文摘要:

Topic modeling refers to the task of discovering the underlying thematic structure in a text corpus, where the output is commonly presented as a report of the top terms appearing in each topic. Despite the diversity of topic modeling algorithms that have been proposed, a common challenge in successfully applying these techniques is the selection of an appropriate number of topics for a given corpus. Choosing too few topics will produce results that are overly broad, while choosing too many will result in the "over-clustering" of a corpus into many small, highly-similar topics. In this paper, we propose a term-centric stability analysis strategy to address this issue, the idea being that a model with an appropriate number of topics will be more robust to perturbations in the data. Using a topic modeling approach based on matrix factorization, evaluations performed on a range of corpora show that this strategy can successfully guide the model selection process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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