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摘要: Web文本表示是Web文本特征提取和分类的前提,最常用的文本表示是向量空间模型(VSM),其中向量一般是基于词的特征项。由于向量空间模型本身没有考虑文本上下文间的潜在概念结构(如词汇间的共现关系),而Web文本是一种半结构化文本,同时经常有新词出现,因此在VSM基础上提出了一种基于新词发现的Web文本表示方法:首先进行预处理将网页转化为文本;然后进行文本分词;接着通过二元互信息进行新词发现,同时把新词加入字典重新分词;最后用词和新词共同来表示Web文本。实验结果表明,该方法可以帮助识别未登录词并扩充现有字典,能够增强Web文本表示能力,改善Web文本的特征项质量,提高Web文本分类效果。