By computing each density of class in training set and the average density of the whole training set, some samples in the high-density class can be deleted using the training samples reduction method.

• 通过计算训练样本集中各类别的类别密度及整个训练集的平均密度，去掉高密度类别中的部分样本； 渐进式分类模式模拟人工分类文本的智能化形式，分为按标题分类、按关键段落分类和按全文分类三个层次，尽量减少分析全文的比例。