For example, text categorization is characterized with a high number of classes and training examples as well as too many noises, and SVMs have some drawbacks in text categorization application such as lower speed in training and classification.

• 例如,文本分类具有类别和样本数目多、噪音多等特点,支持向量机用于文本分类时存在训练和分类速度较慢等缺点。