What parameters should I change to train a SparseConvUnet model on a customized dataset?

### 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 [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

Hi, may I know how to change the parameters in sparseconvunet_scannet.yaml to train a model on a customized dataset?

The current dataset in my hand is a urban-scale outdoor dataset, like sensatUrban, which is a little bit different from scannet.

Thanks so much for any ones' help.

Cheers,

Eric.