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CHAPTER 23 Question Answering - Stanford University

BM25 introduced in Chapter 6, and a slightly more powerful variant called BM25. We’ll reintroduce tf-idf here so readers don’t need to look back at Chapter 6. Tf-idf (the ‘-’ here is a hyphen, not a minus sign) is the product of two terms, the term frequency tf and the indirect document frequency idf.

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