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hover.rankExpression.bm25(field).md Maven / Gradle / Ivy

Calculates the [Okapi BM25](https://en.wikipedia.org/wiki/Okapi_BM25)
ranking function over the given [indexed string field](https://docs.vespa.ai/en/reference/schema-reference.html#indexing-index).
This feature is cheap to compute, about 3-4 times faster than nativeRank,
while still providing a good rank score quality wise.
This feature is a good candidate for usage in a first phase ranking function when ranking text documents.
Note that the field must be enabled to be used with the bm25 feature;
set the enable-bm25 flag in the [index](https://docs.vespa.ai/en/reference/schema-reference.html#index)
section of the field definition.
See the [BM25 Reference](https://docs.vespa.ai/en/reference/bm25.html) for more detailed information.