课程: Complete Guide to NLP with R

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Term frequency with bind_tf_idf( )

Term frequency with bind_tf_idf( ) - R教程

课程: Complete Guide to NLP with R

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Term frequency with bind_tf_idf( )

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- [Instructor] Natural language processing uses a sophisticated statistic called term frequency and inverse document frequency. The math behind this particular statistic is deep and I'm not going to go into it right now, instead of what I'm going to do is spend time showing you how to compute this particular statistic. I've set up code and in line five, six, and seven I bring in the necessary libraries, tidyfirst, tidytext and readtext. The first thing I want to show you is a standard term frequency, which is what we've been using all along. Term frequency is simply the number of times a word appears in this document. Now, this is a bit different than the term frequency used in TFIDF. In TFIDF, term frequency is compared to the number of documents. One of the other things that's important about TFIDF is you'll need to know the number of words in a document. In line 17 and 18, I've provided you with this code, but we…

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