用tfidf和余弦相似度计算句子间相似度，-use the tfidf and cosin to count the similarity between two english sentences

你可以通过此段代码完成两个字符串之间的相似度的计算。然后根据相似度的值就可以判定两个字符串是不是匹配-You can finish the calculation of similarity between two strings by this code. Then according to the similarity values will be able to determine the two string matching is it right?