cluster_dbscan crashes on large clouds
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bug
geometry
pointcloud
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Description
**Describe the bug**
I have a bigger (4088000 points) point cloud; when I run a dbscan (params:2,90,True) on it, the python crashed without any error - in the system monitor, I see it works hard on each cores (~30-40 sec), then crashes. (In spyder, the ipython console crashes without any message).
I have tried to to update all (conda update --all), but it did not help.
**To Reproduce**
load a big point cloud
execute dbscan
**Environment (please complete the following information):**
- OS: Fedora 31
- Python version: 3.7.6
- Open3D version: 0.9.0
- Is this remote workstation?: no
- How did you install Open3D?: conda
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