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* Update test_windows.ps1

* Update .appveyor.yml

* Update .appveyor.yml

Remove checks for label when loading dataset from binary file because label is ignored in that case (#4737)

* mock func for no openmp

* use omp_get_max_threads
Co-authored-by: hzy46 <email@example.com>

* Update dataset_loader.cpp

* Update dataset_loader.cpp

* Update dataset_loader.cpp

* Update _pkgdown.yml

* Update .appveyor.yml

* Update VERSION.txt

* Auto-update configure
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* [docs] fix broken SynapseML link

* just remove link

* release v3.3.1

* update cran-comments

* Auto-update configure
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Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>

* add jobs mimicking CRAN gcc-ASAN and clang-ASAN

* comment out CI

* fix redirection

* remove unnecessary echo

* Revert "comment out CI"

This reverts commit 899fbb4574b99a8125b28761425e3e821bfdfef1.

* remove redundant env variables and update README

* remove inaccurate comment

* change test title

* Revert "Fix ASAN issues with `std::function` usage (#4673)"

This reverts commit 13ed38ca

.

* Revert "Revert "Fix ASAN issues with `std::function` usage (#4673)""

This reverts commit 24c275ba84f1f182275f74ff4ad2e510bb18f4bd.

* revert unnecessary change in config order

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

* Improve error message for plot_metric with Booster

* Update error message

* [R-package] allow for small numerical differences in Booster test

* only use less-strict test on Windows

* add hzy46 and tongwu-msft as code owners

* fix github link for Zhiyuan He

* fix R API link to point to the current version of docs

Co-authored-by: hzy46 <email@example.com>

* 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"