added support for lightgbm booster

[marsupialtail]

Issue #539 : added support for LightGBM booster

[ghost]

All CLA requirements met.

[ksaur]

@marsupialtail Thanks so much for the PR! :) I think there are some lint things to check on in the CI/CD.

Can you please also add tests inside of test_lightgbm_converter.py to make sure that all lines of convert_lgbm_booster hit coverage? Thank you! And please let me know if you have questions; happy to help.

[marsupialtail]

I added the tests based on the LGBRanker PR you referred. Not sure if that's what you are looking for.

[ksaur]

@marsupialtail I think there is another lint thing. (I tried to give permissions so the CI/CD would automatically run for you but it didn't seem to work.)

PR looks great otherwise! (cc: @interesaaat any comments? )

[ksaur]

Ok I think I fixed it so you should be able to run the ci/cd without additional permissions. (Github must have changed some setting, because the subsequent run should have 'just ran')

There's some formatting issue, please take a look. Thanks!

[marsupialtail]

Sorry but I absolutely hate lint. Not sure if I will have too much motivation to finish fixing the lint problems :-(

[codecov-commenter]

Codecov Report

Merging #540 (6b41229) into main (4cd9c04) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
+ Coverage   90.62%   90.63%   +0.01%     
==========================================
  Files          78       78              
  Lines        4510     4516       +6     
  Branches      839      839              
==========================================
+ Hits         4087     4093       +6     
  Misses        237      237              
  Partials      186      186              

Flag	Coverage Δ
unittests	90.47% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
hummingbird/ml/operator_converters/lightgbm.py	96.36% <100.00%> (+0.44%)	⬆️
hummingbird/ml/supported.py	92.98% <100.00%> (ø)

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[ksaur]

Thanks for the contribution and for sticking with it @marsupialtail !