* docs(zh_cn/tutorials): add fileio tutorials

* Update docs/zh_cn/tutorials/fileio.md

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* [Docs] Add data transform migration docs

* Imporve according to comments

* [Docs] cross library import examples.

* update

* resolve comments

* refine metric/evaluator doc

* resolve comments

* resolve comments

* Update demo in get started tutorial

* Update demo tutorial

* Refactor the pytorch demo

* Add outline and titles to the demo tutorial.

* Move file and change title

* Add shuffle in dataloader arguments.

* Improve according to comments

* add introduction of mmengine in get_started.md

* resolve comments

* resolve comments

* resolve comments

* resolve comments

* resolve comments

* resolve comments

* update figs

* [CI] Full tests

* Add github tests

* fix

* fix typo

Co-authored-by: zhouzaida <zhouzaida@163.com>

* [Docs] Refine registry docs

* explain how to use _scope_

* refine

* [Docs] Add resume training examples

* refine

* rename filename

* minor refinement

* fix comments

* resolve comments

* resolve comments

* add optimizer wrapper docs

* remove optimizer.md

* minor refine

* Fix as comment

* minor refine

* tmp save ipynb

* add default constructor docs

* remove ipynb

* fix as comment

* remove color charactor

* fix as comment

* regist pytorch ddp and dp, add unit test

* minor refine

* Support check custom wrapper

* enhance ut

* Update basedataset.md

* Update basedataset.md

* Update basedataset.md

* Update basedataset.md

* Slight rephrase

Co-authored-by: Wenwei Zhang <40779233+ZwwWayne@users.noreply.github.com>

* add args to OptimWrapper.step backward zero_grad

* minor refine

* minor refine

* [Fix] Fix EMAHook trigger train loop init during testing.

* fix sync buffer

* update ut

* fix sync buffer

* fix sync buffer

* [Doc] Migrate scheduler.

* [Doc] Migrate scheduler.

* update

* resolve comments

* resolve comments

* add set random seed fun

* fix conflict

* allign the previous version

* Add Visualizer tutorials

* Add Visualizer designs

* update

* update

* update

* fix commit

* add demo image

* simplify code according to #440 and add some results picture

* replace image url

* update

Co-authored-by: liukuikun <liukuikun@sensetime.com>

* [Refactor]: modify interface of Visualizer.add_datasample (#365)

* [Refactor] Refactor data flow: refine `data_preprocessor`. (#359)

* refine data_preprocessor

* remove unused BATCH_DATA alias

* Fix type hints

* rename move_data to cast_data

* [Refactor] Refactor data flow: collate data in `collate_fn` of `DataLoader`  (#323)

* acollate data in dataloader

* fix docstring

* refine comment

* fix as comment

* refactor default collate and psedo collate

* foramt test file

* fix docstring

* fix as comment

* rename elem to data_item

* minor fix

* fix as comment

* [Refactor] Refactor data flow: `data_batch` argument of `Evaluator.process is a `dict` (#360)

* refine evaluator and metric

* compatible with new default collate

* replace default collate with pseudo

* Handle data_batch in metric

* fix unit test

* fix unit test

* fix unit test

* minor refine

* make data_batch optional

make data_batch optional

* rename outputs to predictions

* fix ut

* rename predictions to outputs

* fix docstring

* fix docstring

* fix unit test

* make outputs and data_batch to kwargs

* fix unit test

* keep signature of metric

* fix ut

* rename pred_sample arguments to data_sample(Visualizer)

* fix loop and ut

* [refactor]: Refactor model dataflow (#398)

* [Refactor] Refactor data flow: refine `data_preprocessor`. (#359)

* refine data_preprocessor

* remove unused BATCH_DATA alias

* Fix type hints

* rename move_data to cast_data

* refactor model data flow

tmp_commt

tmp commit

* make val_cfg and test_cfg optional

* roll back runner

* pass test mmdet

* fix as comment

fix as comment

fix ci in DataPreprocessor

* fix ut

* fix ut

* fix rebase main

* [Fix]: Fix test val ddp (#462)

* [Fix] Fix docstring and type hint of data flow (#463)

* Fix docstring of data flow

* change signature of hook

* fix unit test

* resolve conflicts

* fix lint

* Rename data to structure

* adjust the way to import module

* adjust the way to import module

* rename Structure to Data Structures in docs api

* rename structure to structures

* support using some modules of mmengine without torch

* fix circleci config

* fix circleci config

* fix registry ut

* minor fix

* move init method from model/utils to model/weight_init.py

* move init method from model/utils to model/weight_init.py

* move sync_bn to model

* move functions depending on torch to dl_utils

* format import

* fix logging ut

* add weight init in model/__init__.py

* move get_config and get_model to mmengine/hub

* move log_processor.py to mmengine/runner

* fix ut

* Add TimeCounter in dl_utils/__init__.py

* [Refactor] Refactor the import rule

* minor refinement

* add a comment

* Move the design of hook to design/hook.md

* add relative links in docs

* update docstring of hooks

* refine checkpointhook docs

* refine

* fix comments

* refine

* add logging.md link in hook.md

* resolve comments

* fix typo

* [Docs] Add speed training examples

* refine

* refine

* rename filename

* minor refine

* modify the tutorials of basedataset

* tmp commit

* Add save_gpu_memory docs

* update

* fix comment

* fix comment

[Visualizer] use FigureManager to manage figure to avoid affecting plt.show() outside Visualizer(#440)

* figure in Visualizer is not managed by plt

* encapsulate code and remove unused code

* [Doc] Update runner documents.

* update

* fix link

* update

* update

* Update import manner of Runner

Co-authored-by: Wenwei Zhang <40779233+ZwwWayne@users.noreply.github.com>

* docs: modify distributed tutorials

* docs: modify distributed tutorials

* docs(zh_cn/tutorials): fix wrong modifications in distributed.md

[Refactor]: migrate LMDB backends and modifications from open-mmlab/mmcv#1764 and  open-mmlab/mmcv#1747 (#426)

* Add fileio ut

* pick modification from master branch

* pick modification from mmcv #1764

* test fileio without mmcv

* remove unnecessary checking

* [Docs] Update scheduler doc.

* update

* Support build evaluator from list of built metric

* regist evaluator

* fix as comment

* add unit test

* Add installation docs

* fix typo

* support build optimizer wrapper from built Optimizer instance

* refine comments