* wip

* wip

* wip

* move hybrid wrapper to hybrid backend dir

* move hybrid wrapper to correct namespace

* wip

* sorta working

* remove debug from sorta working homogeneous hybrid backend

* is_supported is supported for GPU

* cleanup debug

* more progress

* remove debug

* cleanup

* turn off hybrid by default

* revert change

* revert

* rename wrapper to backend

* revert

* address review comments

* style