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[EXP] use roaring bitmaps for MinHash #3444

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Try out using roaring bitmaps as in-memory representation of hashes for MinHash. We already use roaring bitmaps in the RevIndex (to store lists of datasets containing a specific hash).

This PR mostly goes for minimal changes to make it work, but future goals are

  • optimize, this is just enough to make it work
  • serialize/deserialize directly from disk, without generating a full list of hashes (this will likely need to move away from JSON...)
  • try out for LargeMinHash too? see how bad it is

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codspeed-hq bot commented Dec 19, 2024

CodSpeed Performance Report

Merging #3444 will degrade performances by 94.34%

Comparing lirber/roaring_mh (f07cba6) with latest (f4f5187)

Summary

⚡ 1 improvements
❌ 7 regressions
✅ 13 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

Benchmark latest lirber/roaring_mh Change
abund0_ani_ci0 717 µs 12,671.4 µs -94.34%
abund0_ani_ci1 736.7 µs 12,834.6 µs -94.26%
abund1_ani_ci0 938.6 µs 14,355.9 µs -93.46%
abund1_ani_ci1 960 µs 14,518.1 µs -93.39%
intersection 20.3 µs 200.1 µs -89.88%
intersection_size 18.3 µs 157.2 µs -88.36%
large intersection 10.6 ms 22.7 ms -53.27%
large intersection_size 9,302.8 µs 234.2 µs ×40

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codecov bot commented Dec 19, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.38%. Comparing base (f4f5187) to head (f07cba6).

Additional details and impacted files
@@            Coverage Diff             @@
##           latest    #3444      +/-   ##
==========================================
+ Coverage   86.42%   92.38%   +5.95%     
==========================================
  Files         137      104      -33     
  Lines       16106    12925    -3181     
  Branches     2219     2219              
==========================================
- Hits        13920    11941    -1979     
+ Misses       1879      676    -1203     
- Partials      307      308       +1     
Flag Coverage Δ
hypothesis-py 25.43% <ø> (ø)
python 92.38% <ø> (-0.02%) ⬇️
rust ?

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