arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1505.05613cs.IRcs.AIcs.DC
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并行流签名EM树:一种面向Web规模应用的聚类算法

Parallel Streaming Signature EM-tree: A Clustering Algorithm for Web Scale Applications

Game Analytics ApS;Queensland University of Technology(昆士兰科技大学)

Christopher M. de Vries, Lance De Vine, Shlomo Geva, Richi Nayak

摘要:

网络的激增提出了自动分析数十亿页自然语言的未解决问题。我们引入了一个可扩展的算法,集群数亿的网页到数十万集群。它使用高效的算法和压缩的文档表示在一台中型机器上完成这项工作。它适用于两个网络规模的爬行,覆盖数十TB。Cocktail Web09和Cocktail Web12包含5亿和7.33亿个网页,并被聚类为50万到70万个集群。据我们所知,这种细粒度的聚类以前还没有被证明。以前的方法对样本进行聚类,限制了可聚类的最大数量。建议EM树算法使用整个集合的聚类和产生几个数量级以上的集群比现有的算法。细粒度聚类对于大规模集合中有意义的聚类是必要的,其中不同主题的数量随着集合大小线性增长。这些细粒度的集群表现出一个改进的集群质量进行评估时,两个新的评价,使用特设的搜索相关性判断和垃圾邮件分类的外部验证。这些评估解决了分类标签不可用和不可行的聚类质量评估问题。

英文摘要:

The proliferation of the web presents an unsolved problem of automatically analyzing billions of pages of natural language. We introduce a scalable algorithm that clusters hundreds of millions of web pages into hundreds of thousands of clusters. It does this on a single mid-range machine using efficient algorithms and compressed document representations. It is applied to two web-scale crawls covering tens of terabytes. ClueWeb09 and ClueWeb12 contain 500 and 733 million web pages and were clustered into 500,000 to 700,000 clusters. To the best of our knowledge, such fine grained clustering has not been previously demonstrated. Previous approaches clustered a sample that limits the maximum number of discoverable clusters. The proposed EM-tree algorithm uses the entire collection in clustering and produces several orders of magnitude more clusters than the existing algorithms. Fine grained clustering is necessary for meaningful clustering in massive collections where the number of distinct topics grows linearly with collection size. These fine-grained clusters show an improved cluster quality when assessed with two novel evaluations using ad hoc search relevance judgments and spam classifications for external validation. These evaluations solve the problem of assessing the quality of clusters where categorical labeling is unavailable and unfeasible.

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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