* rename global accessible and intergration get_sintance and create_instance

* move ManagerMixin to utils

* fix as docstring and seporate get_instance to get_instance and get_current_instance

* fix lint

* fix docstring, rename and move test_global_meta

* fix manager's runtime error description

fix manager's runtime error description

* Add comments

* Add comments

* add writer

* update

* update

* update docstr

* update unittest

* update unittest

* fix comment

* update unittest

* fix comment

* fix comment

* fix comment

* fix comment

* update

* [WIP] Visualizer

* add draw featmap

* update docstring

* update docstring

* update docstring

* fix comment

* fix comment

* fix comment

* fix comment

* fix comment