feature dimensional reduction
feature dimensional reduction
特征降维
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Feature space is high dimensional and sparse in text categorization, the process of dimension reduction is a very key problem for large-scale text categorization.
文本分类中特征向量空间是高维和稀疏的，降维处理是分类的关键步骤。
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