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* v3.3.0 release

* Auto-update configure

* Update R-package/DESCRIPTION
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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

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* [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
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* fix tests

* Apply suggestions from code review
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* move asserts inside try-catch
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* [R-package] introduce Dataset set_field() and get_field()

* fix incorrect fields

* update pkgdown

* fix example

* fix another example

* Apply suggestions from code review
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* update docs
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* 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
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* Update README.rst

* Update README.md

* Update Installation-Guide.rst

[python-package] Support 2d collections as input for `init_score` in multiclass classification task (#4150)

* initial implementation of init_score for multiclass classification

* check for 1d or 2d collection in init_score

* remove dataset import

* initial comments

* update dask test and docstrings

* update docstrings

* move logic to set_field. reshape back on get_field

* add type hints and update docstrings for dask. fix Dataset.set_field

* revert wrong docstrings and type hints

* add extra comma for consistency

* prefix private functions with underscore

add type hints to new functions

make commas consistent in dask and basic

* add missing spaces after type hint

* remove shape condition for dataframe in is_2d_collection
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* fix R memory leaks

* attempt at solving linter complaints

* fix compilation on windows

* move R_API_BEGIN to correct place

* make sure exception objects reach out of scope

* better way to solve rchk complaints

* remove goto statement

* Update __init__.py

* Update Python-API.rst

* Update engine.py

* Update test_utilities.py

* Update sklearn.py

* Update callback.py

* Update callback.py

* Update callback.py

* deprecate advanced args of `train()` and `cv()`

* update Dask test

* improve deducing

* address review comments

* [R-package] avoid unnecessary computation in Dataset set_reference() method

* re-arrange conditions

* do more validation upfront and add tests

* Update R-package/tests/testthat/test_dataset.R
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* Update R-package/tests/testthat/test_dataset.R
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* [docs] add lightgbm_ray to docs

* add docs link

* Apply suggestions from code review
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* move Ray

* Update docs/Parallel-Learning-Guide.rst
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* deprecate `silent` and standalone `verbose` args. Prefer global `verbose` param

* simplify code

* Rephrase warning messages