* update doc

* update doc

* Update mmengine/structures/base_data_element.py

* Update mmengine/structures/base_data_element.py

* Apply suggestions from code review

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

* remove redundant attribute in dump or print

* optimize efficiency

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

* structure tutorials

* refine data element docs

* modify introduce

* fix comment

* fix comment

* fix comment

* 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