[GitHub] [lucene] jtibshirani commented on pull request #416: LUCENE-10054 Make HnswGraph hierarchical

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jtibshirani commented on pull request #416:
URL: https://github.com/apache/lucene/pull/416#issuecomment-953198759


   > As can be seen from the comparison, there is very slight change that the hierarchy brings: a small increase in recall by at the expense of lower QPSs
   
   It looks like QPS is sometimes worse, but often better (like in all the sift-128-euclidean runs, num_cands >=50). I wonder if the first runs are affected by a lack of warm-up? My original set-up you linked to didn't include a warm-up, and in LUCENE-9937 we found that this can have a big impact on the first runs. 


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