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* harmless changes
Signed-off-by: lizz <lizz@sensetime.com>

* Update conv_module.py

* No bracket for simple class
Signed-off-by: lizz <lizz@sensetime.com>

* allow registering new backends with decorators

* add a docstring

* minor update to the docstring

* add PetrelBackend

* update docs

* add path_maps for Ceph

* rename to path_mapping

* fixed import

This reverts commit 7f80a2c6.

* add PetrelBackend

* update docs

* add path_maps for Ceph

* rename to path_mapping

* add file client

* install missing requirements

* use .format() instead of f-string