Found a large number of high-degree overlapped bigrams and high-degree biased bigrams existing in bigram feature set.
发现特征集中存在大量高度重叠特征和高度偏差特征。
In those texts, we select bigram as feature after Chinese word segmentation, deleting stop word and other process.
在筛选出的文本中，经过分词、去除停用词等处理后，选取二元词串作为特征；
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