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Tweak Tiktoken's BytePairEncode for improved perf #7017

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merged 1 commit into from
Feb 20, 2024

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stephentoub
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  • Stackalloc the indices/ranks when feasible
  • Use a span to eliminate bounds checks and allow for directly updating ranks
[Benchmark]
public int CountTokens() => _tokenizer.CountTokens(Poem);

with the same Poem as in #7012, and setting the LruCache size to 0 in order to skip the cache and measure what's being changed here...

Before:

Method Mean Allocated
CountTokens 61.11 us 19.52 KB

After:

Method Mean Allocated
CountTokens 58.82 us 11.27 KB

cc: @tarekgh

- Stackalloc the indices/ranks when feasible
- Use a span to eliminate bounds checks and allow for directly updating ranks
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codecov bot commented Feb 20, 2024

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (f976424) 68.81% compared to head (b50995c) 68.81%.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #7017      +/-   ##
==========================================
- Coverage   68.81%   68.81%   -0.01%     
==========================================
  Files        1258     1258              
  Lines      250643   250653      +10     
  Branches    25606    25608       +2     
==========================================
+ Hits       172479   172480       +1     
- Misses      71540    71546       +6     
- Partials     6624     6627       +3     
Flag Coverage Δ
Debug 68.81% <80.76%> (-0.01%) ⬇️
production 63.28% <80.76%> (-0.01%) ⬇️
test 88.44% <ø> (+<0.01%) ⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Coverage Δ
...c/Microsoft.ML.Tokenizers/Utils/BytePairEncoder.cs 88.23% <80.76%> (-6.60%) ⬇️

... and 3 files with indirect coverage changes

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LGTM!

@tarekgh tarekgh merged commit 3282f44 into dotnet:main Feb 20, 2024
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2 participants