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* fix C API docs rendering

* place comments before members they describe

* don't compare std::function to nullptr ref #4633

* Update dataset_loader.h

* update Guolin's e-mail in `setup.py`

* change maintainer's info

* Replace deprecated `licenseUrl` field with `license` one in `.nuspec` file

* Update create_nuget.py

* Update .appveyor.yml

* Update VERSION.txt

* Auto-update configure
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* v3.3.0 release

* Auto-update configure

* Update R-package/DESCRIPTION
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Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>

Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>

Co-authored-by: strobel <thaddaeus.strobel@ai4bd.com>
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[python][sklearn] add `__sklearn_is_fitted__()` method to be better compatible with scikit-learn API (#4636)

* Use the latest gcc version in macOS CI jobs

* test: swap compilers

* Revert "test: swap compilers"

* Revert "test: swap compilers"

* allow inclusion in C programs

* adding documentation to macro

* Support for ANSI C, _Thread_local where available.

* fix macro for docs

Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>

* [ci] ignore certificates for kitware apt channel in CUDA jobs (fixes #4646)

* try building from a fork

* Update .gitmodules

* [ci] bump CUDA version from 11.4.0 to 11.4.2 at CI

* Update cuda.yml

* [R-package] fix segfaults caused by missing Booster and Dataset handles (fixes #4208)

* fix test errors

* fixes for cpplint

* Update R-package/tests/testthat/test_dataset.R
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* fix tests

* Apply suggestions from code review
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* move asserts inside try-catch
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [R-package] introduce Dataset set_field() and get_field()

* fix incorrect fields

* update pkgdown

* fix example

* fix another example

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* update docs
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Co-authored-by: Yu Shi <shiyu1994@qq.com>

* fix incorrect behavior of SplitInfo == operator for splits with identical gains

* LightSplitInfo too, and improve comment

* dont check features unnecessarily

* update LightSplitInfo too

* Update README.md

* Update Parallel-Learning-Guide.rst

* Update README.md

* Update docs/Parallel-Learning-Guide.rst
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: James Lamb <jaylamb20@gmail.com>