http://jakarta.apache.org/lucene/docs/api/org/apache/lucene/search/Similarity.html
fieldNorm is defined as
getBoost(t.field in d) * lengthNorm(t.field in d)
These two values are multipled into a single value at index time, and it is unfortunately impossible to separate them at search time, when explanations are produced.
If you never apply boosts, fieldNorm() is just lengthNorm(). If you apply boosts, then it is these two factors combined.
Doug
Grant Ingersoll wrote:
Hi,
Was wondering what the fieldNorm section means when using the Explain functionality? How does this relate to the scoring algorithm given in the Similarity javadocs?
Thanks, Grant
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