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* [Feature] Choose storage backend by the prefix of filepath

* refactor FileClient and add unittest

* support loading from different backends

* polish docstring

* fix unittet

* rename attribute str_like_obj to is_str_like_obj

* [Docs] Upload checkpoint to petrel oss

* add infer_client method

* Support uploading checkpoint to petrel oss

* add check_exist method

* refactor CheckpointHook

* support uploading logs to ceph

* rename var client to file_client

* polish docstring

* enhance load_from_ceph

* refactor load_from_ceph

* refactor TextLoggerHook

* change the meaning of out_dir argument

* fix test_checkpoint_hook.py

* add join_paths method

* remove join_paths and add _format_path

* enhance unittest

* refactor unittest

* add a unittest for EvalHook when file backend is petrel

* singleton pattern

* fix test_clientio.py

* deprecate CephBackend

* add warning in load_from_ceph

* fix type of out_suffix

* enhance docstring

* refactor unittest for petrel

* refactor unittest for disk backend

* update io.md

* add concat_paths method

* fix CI

* mock check_exist

* improve docstring

* improve docstring

* improve docstring

* improve docstring

* add isdir and copyfile for file backend

* delete copyfile and add get_local_path

* remove isdir method of petrel

* fix typo

* rename check_exists to exists

* refactor code and polish docstring

* fix windows ci

* add comment and polish docstring

* polish docstring

* polish docstring

* rename _path_mapping to _map_path

* polish docstring and fix typo

* refactor get_local_path

* add list_dir_or_file for FileClient

* add list_dir_or_file for PetrelBackend

* fix windows ci

* Add return docstring

* polish docstring

* fix typo

* fix typo

* fix typo

* fix error when mocking PetrelBackend

* deprecate the conversion from Path to str

* add docs for loading checkpoints with FileClient

* rename keep_log to keep_local

* refactor map_path

* add _ensure_methods to ensure methods have been implemented

* fix list_dir_or_file

* rename _ensure_method_implemented to has_method

* refactor

* polish information

* format information

* Add code-spell hook to pre-commit

* Add code-spell hook to pre-commit and fix typos

* fix setup.cfg

* [Fix] Fix the bug that training log and evaluating log are mixed

* [Fix] Fix the bug that training log and evaluating log are mixed

* fix comment

* fix import error

* refactor

* refactor

* refactor

* clear log_buffer before evaluation

* fix error

* add unittest

* EvalHook uses case-insensitive key indicator matching and configurable test functions

* * fix docstring

* * move test_fn import into __init__
* configurable greater/less keys

* * update unittest
* update DistEvalHook

* fix comments and remove debug code

* support single greater/less key

* add EvalHook

* add EvalHook

* refactor docstring

* polish

* use cp instead symlink

* add error info

* Update eval.py

* Update eval.py

* update

* add engine depandancy

* add comments

* fix unittest

* fix

* update unittest

* update unittest

* add docstring

* fix docstring