Ciro

Results 3 issues of Ciro

![image](https://user-images.githubusercontent.com/71935752/211499457-638e0e0d-0006-49b1-a070-c2964c0ed27d.png) Hi I am using RandLA-Net to do ground filtering, but when I try to test the model, it always outputs min possibility = 0, I wonder how to solve...