* change pre-commit-config

* modify docs with pre-commit hook

* change pre-commit-config-zh-cn

* fallback readme.md

Co-authored-by: HAOCHENYE <21724054@zju.edu.cn>

* [WIP] Refactor-docs-structure

* [Docs] Check link and fix rst  (#498)

* check link

* fix rst

* Fix conf.py

* Fix lint

* minor refine

* minor refine

* modify zh_readme and index.rst

* add migration exampls get_started design to en

* add tutorials to en

* correct chinese doc link

* Apply suggestions from code review

* Update docs/en/advanced_tutorials/distributed.md

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

Co-authored-by: Mashiro <57566630+HAOCHENYE@users.noreply.github.com>

* structure tutorials

* refine data element docs

* modify introduce

* fix comment

* fix comment

* fix comment

* refine docs of data element

* update

* resolve comments

* [WIP] abstract-data-structure

* update docs

* update

* update BaseDataSample

* fix comment and coverage 100%

* update and add _set_field

* update

* split  into base_data_element and base_data_sample

* update

* update

* update

* fix typo

* add unit tests of data abstract interface

* update

* update

* update docs of data element

* a draft of UT of datasample, to be finished

* update datasample test

* updata

* update

* fix comments

* fix comments

* fix comments

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

* update isort

* update

* update comments

* update

* update

* update

* fix bug in use cases

* resolve all comments

* add description of basedatasample

* rename meta_info to metainfo as meta is an adj.

* update

* resolve comments

* clean set data

* finished doc

* rephrase

* update

* resolve comments

* more clear organization

* rephrase

* rephrase

* replace 基础数据元素 by 数据元素

* rephrase