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* 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>

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

* 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
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update R-package/tests/testthat/test_dataset.R
Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [docs] add lightgbm_ray to docs

* add docs link

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

* move Ray

* Update docs/Parallel-Learning-Guide.rst
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-12@hotmail.com>

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

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

* deprecate `silent` and standalone `verbose` args. Prefer global `verbose` param

* simplify code

* Rephrase warning messages

* [ci] explicitly set --platform when running aarch64 image in QEMU builds

* empty commit

* empty commit 2

* empty commit 3

* detect platform programmatically

* Update .vsts-ci.yml
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [R-package] fix inaccurate log message in Dataset get_colnames() method

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

* [R-package] preserve uses of '...' in Dataset slice() method

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

* [R-package] introduce keyword arguments for Dataset properties

* adding examples

* trying to fix loading issues

* add check on use of info and fix examples

* eliminate one '...'

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

* Update R-package/R/lgb.Dataset.R

* Dataset get_params() is public
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [R-package] deprecate uses of '...' in Dataset slice() method

* Update R-package/R/lgb.Dataset.R

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

* [R-package] fix warnings in demos

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

* fix additional params issues in multiclass and categorical_feature examples

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

* [R-package] fix warnings in examples

* fix silently-ignored parameter

* Update CODEOWNERS

* Update FAQ.rst

* Update README.md

* Update Parallel-Learning-Guide.rst

* Reffer to string type as `str` and and commas in `list of ...` types

* update `libpath.py` too

* Update callback.py

* Update engine.py

* [ci] upgrade R to 4.1.1

* try moving miktex errors

* [python] add type hints on train() in engine.py

* revert dask.py and sklearn.py changes

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

* update docs on evals_result contents

* Update python-package/lightgbm/engine.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [R-package] add deprecation warnings on uses of '...' in predict()

* add importFrom(utils, modifyList) in NAMESPACE