RandlaNet run very slowly？（about 20000 points）
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### 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 `main` branch).
### My Question
Python pytorch-gpu, RandlaNet run very slowly？（about 20000 points）
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