Adrien Grand created LUCENE-9071:
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Summary: Speed up computation of BM25 scores
Key: LUCENE-9071
URL: https://issues.apache.org/jira/browse/LUCENE-9071
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
We changed the way BM25 scores are computed in LUCENE-7997 in order to
guarantee monotonicity of scores, but this translated to a small decrease of
throughput, see annotation CC (October 2017) on Mike's nightly benchmarks. Even
though the total number of score computations has decreased since we introduced
block-max WAND, its relative cost is not negligible since we not only compute
scores on collected documents, but also when decoding skip lists in order to
compute the maximum score per block, or group of blocks.
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