Yvette Zhao

### Checklist - [X] I have searched for [similar issues](https://github.com/isl-org/Open3D-ML/issues). - [X] I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip). - [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the...

Hi all, I'm newbie to hydra, here I meet a problem in developing my own project. My project is based on mmdetection with it's own yaml configure system, but I...