* tmp
* add scheduler unit test
* disable yapf
* add more test
* add more test
* not use torch test case
* solve comments
* update file
* add more unit tests
* resolve comments
* update cosine ut
* fix typo
* solve comments
* solve comments
* resolve comments
* Add the unittest of registry
* improve the format
* fix the test_repr
* refactor the test_init
* add the copyright for tests directory
* add more unit tests
* fix error
* add unit tests for _search_child and _get_root_registry
* build_from_cfg supports dict, ConfictDict and Config
* improve docstring