Christoph Büscher 2b07f63bd5 Fix NDCG for empty search results (#29267) ... Fixes and edge case where DiscountedCumulativeGain can return NaN as result of the quality metric calculation. This can happen when the search result set is empty and normalization is used. We should return 0 in this case. Also adding related unit tests to the other two metrics.		2018-04-03 11:15:44 +02:00
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src	Fix NDCG for empty search results (#29267)	2018-04-03 11:15:44 +02:00
build.gradle	Use SPI to provide named XContent parsers for ranking evaluation	2017-12-12 18:39:01 +01:00