* [Fix] Init weights after build model.

* add unit tests and docstring

* [Refactor] Refactor Evaluator to Metric.

* update

* fix lint

* fix doc

* fix lint

* resolve comments

* resolve comments

* remove collect_device from evaluator

* rename

* add get_subset method, add comment, rename variable

* add unit test

* Please mypy

* Fix as comment, support negative index, and fix index access error

* add and refine docstring, handle indices=0

* handle indices=0

* add empty list indices test

* rename in_meta in docstring and comments to in_metainfo

* clean meta nameing

* Fix negative indices error

* test empty list of get_subset

* fix comments and docstring

* add unit test

* Fix as comment

* Fix as comment

* add docstring to mention wrapped dataset should not inherit from Basedataset

* Fix wrapped dataset docstring

* Fix wrapped dataset docstring

* Fix method name, docstring, and comments

* Fix comments

* Fix comments

* Fix comments

* [Enhancement] refactor base data elment

* fix comment

* fix comment

* fix pop not existing key without error

* add instance_data

* update

* refine code

* add refer

Co-authored-by: liukuikun <641417025@qq.com>

* [Enhancement] refactor base data elment

* fix comment

* fix comment

* fix pop not existing key without error

* [Enhancement] Rename build_from_cfg to from_cfg

* refactor build_logger and build_message_hub

* remove time.sleep from unit tests

* minor fix

* move set_randomness from setup_env

* improve docstring

* refine comments

* print a warning information

* refine comments

* simplify the interface of build_logger

* [Refactor] Add batch_idx to hook input.

* update

* add defaut scope

* Fix docstring

* override get_current_instance method in DefaultScope

clean meta nameing

* remove default mmengine argument of DefaltScope

remove default mmengine argument of DefaltScope

remove default mmengine argument of DefaltScope

* Fix unit test

Fix unit test

* Fix example in docstring

* add explaination of DefaultScope

* rename global accessible and intergration get_sintance and create_instance

* move ManagerMixin to utils

* fix as docstring and seporate get_instance to get_instance and get_current_instance

* fix lint

* fix docstring, rename and move test_global_meta

* fix manager's runtime error description

fix manager's runtime error description

* Add comments

* Add comments

* [Feature]: Add dist semantics in checkpoint hook

* [Fix]: Delete sync buffer in checkpoint hook

* [Feature] Add Runner and Loop

* refine docstring

* refine docstring

* refine __init__ of Runner

* add Runner.save_checkpoint

* add comment for data_batch

* rename validation_cfg to val_cfg

* update branch

* update branch

* discard wear reference

* set seed for torch in dataloader worker

* refine comments

* reorder methods

* import module in __init__.py

* add runner.load_checkpoint

* rename attributes

* fix indent

* fix indent

* add comment for LOOPS

* add example for methods

* add example for methods

* refine examples

* add Runner.resume and refactor register_hooks

* remove type hint of runner in CheckpointHook

* rename before_run to before_train

* remove collate

* add before_run after_run for loop.run

* dummy collate_fn

* add more unit tests

* move call_hook('before_run') to runner

* minor fix

* add comments for collate_fn

* fix type hint

* refactor logic to load or resume checkpoint

* fix typo

* add comments for IterBasedTrainLoop

* refactor unit tests

* fix unit tests

* refactor

* fix setup_env

* refine

* minor fix

* Merge branch 'main' of github.com:open-mmlab/mmengine into zzd/add-runner

* minor fix

* minor fix

* refine

* refactor unit tests

* fix unit tests

* add launcher property

* add logger, message_hub and writer unit tests

* add cur_dataloader attribute for runner

* fix IterBasedTrainLoop

* add torch.no_grad decorator

* add master_only decorator for save_checkpoint

* add before_test_epoch in TestLoop

* refactor load_or_resume method

* refine docstring

* fix typo

* build_dataloader can handle dataset object

* add dump_config for runner

* collate_fn should not a lambda function

* minor fix

* refine docstring

* fix unit tests

* improve comments

* refine unit tests

* rename collate_fn to pseduo_collate

* add 'TODO' tag

* Messagehub support update dict values

* Messagehub support update dict values

* fix assertion error message

* Fix hook

* Fix

* Fix docs

* FIx

* Fix

* Fix as comment

* update

* Fix hook

* Fix hook

* Fix hook

* Fix itertimerhook

* Fix iter_timer_hook

* Fix

* Fix

* fix logger hook

* Fix loggerhook

* update cur_dataloader

* Fix docstring

* Fix docstring

* Fix as commet

* Fix as commet

* Fix as comment

* rename is_last_epoch, enhance and add after_val before_val .etc

* fix typo in docstring

* remove resolved TODO

* refactor docstring

* [Refactor]: Change scheduler to param_scheduler

* [Fix]: Fix UT of param scheduler hook

Co-authored-by: Your <you@example.com>

* update evaluator prefix

* update docstring and comments

* update doc

* [WIP] testvisualizationhook

* add TestNaiveVisualizationHook

* fix comment

* unpad

* batch imdenormalize

* fix comment

* fix comment

* Config support deep copy

* Fix end of line

* add logger hook

* update

* update

* update test

* update

* update test

* update

* update

* update

* update

* update

* Add logger hook

* Fix pre-commit

* Fix as comment

* Fix as comment

* Fix as comment

* Fix as comment

* Fix as comment

* Fix bytes

* update

* Fix as comment

* Fix as comment

* Update runner

* Fix as comment

* Fix as comment

* Fix as comment

* Fix as comment

* Support default_scope when building optimizer and evaluator.

* add docstring

* fix

* fix

* update type hint and ut for evaluator

* update doc

* fix

* support metric prefix in BaseEvaluator

* update docs

* use class attribute default_prefix

* add writer

* update

* update

* update docstr

* update unittest

* update unittest

* fix comment

* update unittest

* fix comment

* fix comment

* fix comment

* fix comment

* update

* [WIP] Visualizer

* add draw featmap

* update docstring

* update docstring

* update docstring

* fix comment

* fix comment

* fix comment

* fix comment

* fix comment

* [Fix]: Change after inter and epoch to after train iter and epoch

* [Fix]: Add new UT to param scheduler hook

* [Fix]: Change the type of runner in docstring to Runner

Co-authored-by: Your <you@example.com>

* first commit

* update logging

* update MessageHub unit test and LogBuffer unitest

* update logging docs

* update logging impl and test

* update test logging

* update test

* update logging test and impl

* Fix logging test

* Update log_buffer.py

* rename statistics argumentes

* fix as comment

* Fix as comment

* Fix as comment

* Fix as comment

* Fix meta class

* Fix as comment

* Fix as comment

* Fix as comment

* Fix name declare

* Fix as comment

* Fix as comment

* Fix as comment

* Fix docstring

* Fix as comment

* Fix as comment

* [Feature] Add distributed module

* fix IS_DIST error

* all_reduce_dict does operations in-place

* support 'mean' operation

* provide local group process

* add tmpdir argument for collect_results

* add unit tests

* refactor unit tests

* simplify steps to create multiple processes

* minor fix

* describe the different of *gather* in mmengine and pytorch

* minor fix

* add unit tests for nccl

* test nccl backend in multiple gpu

* add get_default_group function to handle different torch versions

* minor fix

* [Feature] Add distributed module

* fix IS_DIST error

* all_reduce_dict does operations in-place

* support 'mean' operation

* provide local group process

* add tmpdir argument for collect_results

* add unit tests

* refactor unit tests

* simplify steps to create multiple processes

* minor fix

* describe the different of *gather* in mmengine and pytorch

* minor fix

* add unit tests for nccl

* test nccl backend in multiple gpu

* add get_default_group function to handle different torch versions

* minor fix

* minor fix

* handle torch1.5

* handle torch1.5

* minor fix

* fix typo

* refactor unit tests

* nccl does not support gather and gather_object

* fix gather

* fix collect_results_cpu

* fix collect_results and refactor unit tests

* fix collect_results unit tests

* handle torch.cat in torch1.5

* refine docstring

* refine docstring

* fix comments

* fix comments

* add runner unit tests

* update

* update

* add test custom loop and hook

* add test model wrapper

* add test setup env

* fix typo

* fix launcher

* fix typo

* test default scope

* add logger test

* fix dataloader

* add test loop

* resolve comments

* resolve comments

* [Feature]: Add Part3 of Hooks

* [Feature]: Add Hook

* [Fix]: Add docstring and type hint for base hook

* add sync buffer hook

* update typing hint and docs

* fix lint

* fix mypy

* fix lint

* use mock from unittest

Co-authored-by: seuyou <3463423099@qq.com>

* add impl

* add test

* Fix as comment

* Fix as comment

* Fix as comment

* Fix as comment

* [Feature]: Add checkpoint hook

* [Fix]: Fix lint

* [Fix]: Delete redundant optional and give an example to our_dir

* [Feature]: Add test the last_ckpt in UT

* [Fix]: Fix docstring problem

* [Fix]: Add patch to UT

* [Feature]: Add Test case for by epoch