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本文通过对著名站点Yahoo层次结构的分析，介绍一种基于此层次结构的文档分类器的机器学习技巧。我们利用此层次学习算法来自动构造分类器每个域的背景知识。
Based on the analysis of the Yahoo site hierarchy of well-known sites, this article introduces a machine learning technique based on this hierarchical document classifier. We use this hierarchical learning algorithm to automatically construct the contextual knowledge of each domain of the classifier.