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* 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>

* fix param name

* Update gpu_tree_learner.h

* Update gbdt.h

* converted LGBM_BoosterSaveModel_R

* switch all other non-params cases

* handle params

* Correct spelling

Most changes were in comments, and there were a few changes to literals for log output.

There were no changes to variable names, function names, IDs, or functionality.

* Clarify a phrase in a comment
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Clarify a phrase in a comment
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Clarify a phrase in a comment
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Correct spelling

Most are code comments, but one case is a literal in a logging message.

There are a few grammar fixes too.
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* real pointer for matrix

* remove R_REAL_PTR

* remove R_INT_PTR

* add test

* [R-package] replace R_AS_INT with R built-in

* update header

* more changes

* 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] move some functions over to SEXP objects

* clarify comment

* remove paste0()

* fix registration table

* fix cmake builds

* [R-package] prevent symbol lookup conflicts

* add unit tests

* only run test on Windows

* move to .Call() calls

* fix references

* testing registration for CMake builds

* revert NAMESPACE changes

* revert testing changes