说明：  详细介绍了贝叶斯公式在自动文本分类领域的使用，并且提到了关于于互信息特征提取的方法。和其分类的例子。，已通过测试。
(Described in detail the use of the Bayesian formula in the field of automatic text classification, and mentioned on the mutual information feature extraction method. And the classification of examples. , Has been tested.)