Correcting -1 neighbor bug for non deformable KPConv

Merge pull request #261 from DLW3D/fix_s3dis_dataset

Re-correct bug in S3DIS dataset. Consider two situations.

Re-correct bug in S3DIS dataset. solve issue #200

Merge pull request #248 from benekoehler/master

feat: add class weights

fix: validation split

chore: update

feat: add Sensat Urban Dataset

random noise on center_point correction

Merge pull request #227 from Yarroudh/yarroudh-toronto3d

Update test_models.py

Update Toronto3D.py

Update train_Toronto3D.py

Update Toronto3D.py