alessandrobenedetti commented on code in PR #926:
URL: https://github.com/apache/lucene/pull/926#discussion_r905042674
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lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraphBuilder.java:
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@@ -246,7 +246,7 @@ private boolean diversityCheck(
for (int i = 0; i < neighbors.size(); i++) {
float neighborSimilarity =
similarityFunction.compare(candidate,
vectorValues.vectorValue(neighbors.node[i]));
- if (neighborSimilarity >= score) {
Review Comment:
Yesterday myself and 2 of our engineers spent literally 3 hours discussing
and testing this, isolating the instruction that was causing this branch to go
slower than the upstream/main .
We ended up with this single change bringing a lot of improvement (and it's
in line with what the BoundChecker was doing).
We isolated the problem and solution there, but we couldn't find a specific
Java reason.
We were wondering if the equality check on top of the "greater than" may
result in additional expense when closer vectors are present?
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