GitLab

* [docs] Change some 'parallel learning' references to 'distributed learning'

* found a few more

* one more reference

Approximately %80 of runtime when loading "low column count, high row
count" DataFrames into Datasets is consumed in `np.fromiter`, called
as part of the `Dataset.get_field` method.

This is particularly pernicious hotspot, as unlike other ctypes-based
methods this is a hot loop over a python iterator loop and causes
significant GIL-contention in multi-threaded applications.

Replace `np.fromiter` with a direct call to `np.ctypeslib.as_array`,
which allows a single-shot `copy` of the underlying array.

This reduces the load time of a ~35 million row categorical dataframe
with 1 column from ~5 seconds to ~1 second, and allows multi-threaded
execution.

* run isort in CI linting job

* workaround conda compatibility issues

* minor mypy type errors fixed

* fix some warnings from mypy

* fix 3 mypy warnings

* selectively ignored some mypy errors

* minor mypy type errors fixed

* minor mypy type errors fixed

* minor mypy type errors fixed

* added import

* Update python-package/lightgbm/callback.py

* Apply suggestions from code review

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

* Update dask.py

* Update sklearn.py

* got fit() working

* add predict()

* predict_proba()

* remove custom objective docs

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

* fix capitalization

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

* fix tests

* fix tests

* fix test comments

* simplify tests

* Apply suggestions from code review

* add support for pandas categorical columns

* remove commented code

* quotes

* syntax error

* fix shape for ranker test

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

* Update tests/python_package_test/test_dask.py

* trying

* fix tests

* remove unnecessary debugging stuff

* skip accuracy checks on categorical

* use category columns as categorical features
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update test_dask.py

* Update dask.py

* Update .vsts-ci.yml

* Revert "Update .vsts-ci.yml"

This reverts commit 98422be5b5095f0585de333b5b5545356776ef88.

* Update dask.py

* Update dask.py

* starting on Dask client

* more docs stuff

* fix pickling

* just copy docstrings

* fit docs

* switch test order

* linting

* use client kwarg

* remove inner set_params()

* add type hints

* fix type hints

* remove commented code

* reorder

* fix tests, add client_ property

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

* fix tests

* linting

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

* start supporting Python 3.9

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Update .appveyor.yml

* Update .vsts-ci.yml

* Update .appveyor.yml

* fixed conflicts

* continue

* document CUDA version support

* address review comments

* collapse CUDA section in the guide

* remove Clang support from CUDA docs as we have never tested it

* add type hints in dask module

* starting on asserts

* remove unused code

* add hints for dtypes

* replace accidentally-removed docstrings

* revert unrelated change

* Update python-package/lightgbm/dask.py

* empty commit

* fix hints on group

* capitalize array

* hide hints in signatures

* empty commit

* sphinx version

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

* fix hint for MatrixLike

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

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

* update docstring

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

* [dask] add tests on warnings, fix incorrect variable in log

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

* Update sklearn.py

* Update dask.py

* fix Dask docstrings and mimic sklearn importing way

* Update .vsts-ci.yml

* revert CI checks

* use import aliases for Dask classes

* check Dask is installed in _predict() func

* fix lint issues introduced during resolving merge conflicts

* Update dask.py

* [dask] allow parameter aliases for tree_learner and local_listen_port (fixes #3671)

* num_thread too

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

* empty commit

* add _choose_param_value

* revert param order change

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

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

* just import deepcopy

* remove machines aliases

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

* store data parts in dict instead of list

* simplify weight/group parts dict assignment

* [dask] warn if attempting to use tree_learn other than data parallel

* add param

* initial Dask docs

* fix MRO

* address review comments

* Update dask.py

* Update basic.py

* hotfix pop

* centralize Python-package logging in one place

* continue

* fix test name

* removed unused import

* enhance test

* fix lint

* hotfix test

* workaround for GPU test

* remove custom logger from Dask-package

* replace one log func with flags by multiple funcs

* [dask] use keyword args for internal function calls

* add missing comma

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

* revert whitespace changes

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