msokolov commented on pull request #315:
URL: https://github.com/apache/lucene/pull/315#issuecomment-926762372
I did run a quick benchmark on an internal data-set (using KnnGraphTester)
and saw some improvement to both latency and recall, and a reduction in nodes
visited from this change:
condition|recall| latency| nDoc | fanout| maxConn| beamWidth|
visited| index ms
------------|-------|-----------|--------------|------------|---------------|---------------|------------|----------------
main |0.815| 0.91| 1000000| 50| 32|
64| 2590| 484529
change |0.836| 0.86 | 1000000 | 50| 32|
64| 2331| 462900
and I think this test is actually unfair to HNSW because of the fanout which
incurs some additional cost in the HNSW case for no benefit (it just increases
top K by that amount and then throws away the extras).
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