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* docs: weight parameter non-negative

* docs: weights non negative only for train data

* docs: weights should be non negative for validation data

* typo in html render

* docs: brief weights non-negative description

* improve docs for sklearn wrapper

* empty commit

* install add scikit-learn to conda environment for building docs

* clarify that categoricals will be converted to ints and not that they should be ints in the input data

* update remaining sections

* update config.h

* add suggestions

* [ci] [docs] use mamba for readthedocs builds (fixes #4954)

* update docs

* simplify build script and add docs flag to gitignore

* exit with non-0 if build fails

* update CI job

* add doxygen

* remove outdated requirement_base.txt reference

* use conda create instead of conda env create

* fix conda create flags

* add nodefaults to env.yml

* Update docs/README.rst
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* try to fix check-docs CI job

* additional changes

* switch from mamba to miniforge

* simplify docker command and fix issues in local build script

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

* update docs and conda

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

[docs] document `conda-forge` channel preference over `default` one and describe possible workaround for OpenMP conflicts in FAQ (#4994)

* Update README.rst

* Update FAQ.rst

* Python FAQ entry about conda-forge

* fix syntax

* add test for custom objective with regressor

* add test for custom binary classification objective with classifier

* isort

* got tests working for multiclass

* update docs

* train deeper model for classifier

* Apply suggestions from code review
Co-authored-by: José Morales <jmoralz92@gmail.com>

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

* update multiclass tests

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

* fix multiclass probabilities

* linting
Co-authored-by: José Morales <jmoralz92@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update README.rst

* Update FAQ.rst

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Update Installation-Guide.rst

* Update install.libs.R

* Update setup.py

* Update r_package.yml

* Update install.libs.R

* [R-package] remove Dataset setinfo()

* revert unintended docs changes

* fix examples

* revert FAQ changes

* empty commit

* [R-package] [docs] add intro vignette (#3946)

* add 10 test vignettes

* Revert "add 10 test vignettes"

This reverts commit 40fb2e2f1982402798776ee44e4ec82fc4644d3d.

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Michael Mayer <mayermichael79@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* add customized parser support

* fix typo of parser_config_file description

* make delimiter as parameter of JoinedLines

* Add 'nrounds' as an alias for 'num_iterations'

* Improve tests

* Compare against nrounds directly

* Fix whitespace lints

[docs ][python] add `datatable` to the mocked modules during docs building process and sort them alphabetically (#4750)

* in predict(), respect params set via `set_params()` after fit()

* extract docs changes

* [docs] fix broken SynapseML link

* just remove link

* 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

* 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

* 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

* [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>

* Update CODEOWNERS

* Update FAQ.rst

* Update README.md

* Update Parallel-Learning-Guide.rst

[docs] Clarify the fact that predict() on a file does not support saved Datasets (fixes #4034) (#4545)

* documentation changes

* add list of supported formats to error message

* add unit tests

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

* update per review comments

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

* [python] add type hints in docs/conf.py

* more specific hint for sphinx app

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

* [docs] [R-package] use CRAN-style builds when building pkgdown site

* install with --with-keep.source

* empty commit

* set new_proccess = FALSE to get a better traceback

* copy pkgdown config

* remove R docs

* bump deps