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* Add linear leaf models to json output

* Add closing bracket

* Move test into test_engine.py and add asserts

* Update tests/python_package_test/test_engine.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update tests/python_package_test/test_engine.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update tests/python_package_test/test_engine.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update test_r_package_windows.ps1

* Update test_r_package.sh

* Update r_package.yml

* Update r_package.yml

Adding compiler flag will automatically link to the required libraries.

Besides, clang static links to sanitizer libraries by default. Thus
linking to dynamic library must be removed in order to use clang.

[python] improving the syntax of the fstring in the file : tests/python_package_test/test_basic.py (#4312)

* run Dask tests on aarch64 architecture

* make random Dask test to fail

* Revert "make random Dask test to fail"

This reverts commit c43c98507f818994bb08b4f7d289ecad3b3449eb.

* empty commit

* empty commit

* empty commit

* empty commit
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* fixed weighted gamma obj

* added unit tests

* fixing linter errors

* another linter

* set seed

* fix linter (integer seed)

* handle arbitrary length feature names in Python-package

* added tests

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* Update lightgbm_R.cpp

* fix typos

[R-package] suppress Wcast-function-type warning in CMake-based gcc and MinGW builds (fixes #4273) (#4274)

* [R-package] suppress Wcast-function-type warning in CMake-based gcc and MinGW builds (fixes #4273)

* suppress warning from CMake side

* added f-string

* fix missing parentheses and other string formatting

* remove extra trailing parenthesis

* one more missing parenthesis

* fix pandas categoricals

* update uses of +

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* added f-string to dask.py

* Update python-package/lightgbm/dask.py
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update python-package/lightgbm/dask.py
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Updated branch

* Updated file as per specifications

* Removed warning as per specification

* update other places

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

* revert unnecessary change

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* [ci] pin dask and distributed in CI jobs

* fix for Python 3.6

* fix control flow mistake

* Update .ci/test.sh
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Migrate to f-strings in python-package\lightgbm\plotting.py

* Apply suggestion from review

* Apply suggestions from code review
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* added f-strings to parameter_generator.py

* fix brace escaping

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

* Update helpers/parameter_generator.py
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* update

* escaping
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* added f-string

* fixed indent issues

* fixed some linting issues

* trying to fix E225 for 233:65

* Update python-package/lightgbm/callback.py

* first_metric_only log message

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* started converting handles

* more changes

* sort of working for Dataset

* yay all the tests are passing for Dataset handle changes

* working for other handle types

* remove debugging logging

* remove unnecessary spaces

* fix null logic

* more NULL

* updates

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

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

This reverts commit a421217e.

[docs] clarify docs for LGBM_BoosterGetEvalNames and LGBM_BoosterGetEvalCounts (fixes #4264) (#4270)

* [R-package] move creation of character vectors in some methods to C++ side

* convert LGBM_BoosterGetEvalNames_R

* convert LGBM_BoosterDumpModel_R and LGBM_BoosterSaveModelToString_R

* remove debugging code

* update docs

* remove comment

* add handling for larger model strings

* handle large strings in feature and eval names

* got long feature names working

* more fixes

* linting

* resize

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

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

* New build option: USE_PRECISE_TEXT_PARSER.

Use fast_double_parser for text file parsing. For each number, fallback
to strtod in case of parse failure.

* Add benchmark for CSVParser with Atof and AtofPrecise.

* Fix lint complaint.

* Fix typo in open result error message.

* Revert "Fix lint complaint."

This reverts commit 92ab0b6bce9f17d7be9eaeb20f19d4a0a36f0387.

* Revert "Add benchmark for CSVParser with Atof and AtofPrecise."

This reverts commit 4f8639abd06c679d4382eb715a1793afd94df3d2.

* Use AtofPrecise in Common::__StringToTHelper.

* [option] precise_float_parser: precise float number parsing for text input.

* Remove USE_PRECISE_TEXT_PARSER compile option.

* test: add test for Common::AtofPrecise.

* test: remove ChunkedArrayTest with 0 length.

This triggers Log::Fatal which aborts the test program.

* fix lint, add copyright.

* Revert "test: remove ChunkedArrayTest with 0 length."

This reverts commit 346c76affe9e78b6ca2738c4a56dbb9c00f31102.

* Use LightGBM::Common::Sign

* save precise_float_parser in model file.

* Fix error checking in AtofPrecise. Add more test cases.

* Remove test case that can't pass under macOS.

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

* [R-package] update docs on C++ interface

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

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

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