Classification is a sort of important information retrieval language, also a tool of scientific and automatic management on information resources.

分类法是一种重要的信息检索语言，也是实现信息资源管理科学化、自动化和网络化不可缺少的工具。

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This paper introduces the retrieval language, analyzes on the application of the retrieval language in library and retrieval system, and discusses on the methods for the classification and subject.

介绍了检索语言，分析了检索语言在图书馆和检索系统中的应用，论述了分类和主题方法。

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To be able to handle with practical issues with machine learning methods, such as: intelligent game, natural language understanding, knowledge retrieval, image recognition and text classification;

能够运用机器学习方法来解决实际问题，如智能博弈程序，自然语言理解，知识获取，图像识别，文本分类等；

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