Trieschnigg, R.B. (Dolf) wrote:
I would like to implement the Okapi BM25 weighting function using my own Similarity implementation. Unfortunately BM25 requires the document length in the score calculation, which is not provided by the Scorer.
How do you want to measure document length? If the number of tokens is an acceptable measure, then the norm contains sqrt(numTokens) by default. You can modify your Similarity.lengthNorm() implementation to not perform the sqrt, or square the norm.
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