tfidf矢量化器和tfidf变压器有什么区别 [英] what is the difference between tfidf vectorizer and tfidf transformer

问题描述

我知道tfidf vectorizer的公式是

Count of word/Total count * log(Number of documents / no.of documents where word is present)

我看到scikit中有一个tfidf转换器学习，我只是想区别一下它们.我找不到任何有用的东西.

I saw there's tfidf transformer in the scikit learn and I just wanted to difference between them. I could't find anything that's helpful.

推荐答案

TfidfVectorizer 用于句子，而 在现有的计数矩阵上使用 TfidfTransformer ，例如 CountVectorizer

TfidfVectorizer is used on sentences, while TfidfTransformer is used on an existing count matrix, such as one returned by CountVectorizer

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